[Kernel-packages] [Bug 1980884] Re: ubuntu guest kernel panics when a sev guest with passthrough mlx5 VF is used

[Si-Wei Liu]

It is verified SEV works for the v5.15 kernel where we wants SEV to be
supported. Closing this one for v5.11 now.

** Changed in: linux-oracle-5.11 (Ubuntu)
   Status: New => Invalid

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1980884

Title:
  ubuntu guest kernel panics when a sev guest with passthrough mlx5 VF
  is used

Status in linux-oracle-5.11 package in Ubuntu:
  Invalid

Bug description:
  Guest kernel panic can be observed when Ubuntu SEV guest with mlx5 vfio-pci 
is started
  as iperf3 server using "iperf3 -s" and as soon as the client tries to connect
  with it.

  Steps to reproduce:

  HOST INFO
  Host type : OCI (Oracle Cloud) Bare-Metal Server
  Server/Machine: ORACLE SERVER E4-2c
  CPU model : AMD EPYC 7J13 64-Core Processor
  Architecture  : x86_64
  Host OS   : Oracle Linux Server release 7.9
  Host Kernel   : 5.4.17-2136.309.3.el7uek.x86_64 #2 SMP Tue Jun 14 21:58:29 
PDT 2022
  Hypervisor: QEMU emulator version 4.2.1 (qemu-4.2.1-17.1.el7)
  OVMF/AAVMF: OVMF-1.6.2-2.el7.noarch
  libiscsi  : libiscsi-1.19.0-1.el7.x86_64
  Guest Kernel  : 5.11.0-1028-ORACLE

  1) Start Ubuntu 20.04/18.04 SEV guest with vfio-pci:

  /usr/bin/qemu-system-x86_64 -machine q35 -name OL20.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol20.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
  -drive
  
file=/systest/atanveer/scripts/Ubuntu-20.04-2022.02.15-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.1 -qmp tcp:127.0.0.1:3334,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL20.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0

  2) Start a client guest OL/Ubuntu:

  /usr/bin/qemu-system-x86_64 -machine q35 -name OL18.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol18.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
  -drive
  
file=/systest/atanveer/scripts/Ubuntu-18.04-2022.02.13-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.2 -qmp tcp:127.0.0.1:,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL18.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0

  3) Flush iptables on both the VMs using "iptables -F"

  4) Start the iperf3 server on the first VM using "iperf3 -s"

  5) Start the iperf3 client on the second VM using "iperf3 -c  -4
  -f M -i 0 -t 70 -O 10 -P 64"

  The kernel panic is seen on the first VM i.e. Ubuntu 20.04 with iperf3 also
  showing "Bad Address" error.

  Console logs:

  root@ubuntu-20-04:~# iperf3 -s
  ---
  Server listening on 5201
  ---
  Accepted connection from 10.196.246.104, port 33732
  [  5] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33734
  [  8] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33736
  [ 10] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33738
  iperf3: error - unable to read from stream socket: Bad address
  ---
  Server listening on 5201
  ---
  [   91.083856] general protection fault:  [#1] SMP NOPTI
  [   91.084591] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 5.11.0-1028-oracle
  #31~20.04.1-Ubuntu
  [   91.085393] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.6.2
  06/01/2022
  [   91.086205] RIP: 0010:memcpy_erms+0x6/0x10
  [   91.086640] Code: cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03
  83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1  a4
  c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
  [   91.088559] RSP: 0018:a9c1408e4b60 EFLAGS: 00010282
  [   91.089105] RAX: 938cd8e48000 RBX: 1000 RCX:
  1000
  [   91.089843] RDX: 1000 RSI: bb6

[Kernel-packages] [Bug 1980884] Re: ubuntu guest kernel panics when a sev guest with passthrough mlx5 VF is used

[Si-Wei Liu]

Thanks for the info, Fabio. I didn't realize the 5.11 kernel is past EoL
already. I'll ask the team to check the result on v5.4 and v5.15 kernel.
Stay tuned.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oracle-5.11 in Ubuntu.
https://bugs.launchpad.net/bugs/1980884

Title:
  ubuntu guest kernel panics when a sev guest with passthrough mlx5 VF
  is used

Status in linux-oracle-5.11 package in Ubuntu:
  New

Bug description:
  Guest kernel panic can be observed when Ubuntu SEV guest with mlx5 vfio-pci 
is started
  as iperf3 server using "iperf3 -s" and as soon as the client tries to connect
  with it.

  Steps to reproduce:

  HOST INFO
  Host type : OCI (Oracle Cloud) Bare-Metal Server
  Server/Machine: ORACLE SERVER E4-2c
  CPU model : AMD EPYC 7J13 64-Core Processor
  Architecture  : x86_64
  Host OS   : Oracle Linux Server release 7.9
  Host Kernel   : 5.4.17-2136.309.3.el7uek.x86_64 #2 SMP Tue Jun 14 21:58:29 
PDT 2022
  Hypervisor: QEMU emulator version 4.2.1 (qemu-4.2.1-17.1.el7)
  OVMF/AAVMF: OVMF-1.6.2-2.el7.noarch
  libiscsi  : libiscsi-1.19.0-1.el7.x86_64
  Guest Kernel  : 5.11.0-1028-ORACLE

  1) Start Ubuntu 20.04/18.04 SEV guest with vfio-pci:

  /usr/bin/qemu-system-x86_64 -machine q35 -name OL20.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol20.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
  -drive
  
file=/systest/atanveer/scripts/Ubuntu-20.04-2022.02.15-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.1 -qmp tcp:127.0.0.1:3334,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL20.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0

  2) Start a client guest OL/Ubuntu:

  /usr/bin/qemu-system-x86_64 -machine q35 -name OL18.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol18.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
  -drive
  
file=/systest/atanveer/scripts/Ubuntu-18.04-2022.02.13-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.2 -qmp tcp:127.0.0.1:,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL18.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0

  3) Flush iptables on both the VMs using "iptables -F"

  4) Start the iperf3 server on the first VM using "iperf3 -s"

  5) Start the iperf3 client on the second VM using "iperf3 -c  -4
  -f M -i 0 -t 70 -O 10 -P 64"

  The kernel panic is seen on the first VM i.e. Ubuntu 20.04 with iperf3 also
  showing "Bad Address" error.

  Console logs:

  root@ubuntu-20-04:~# iperf3 -s
  ---
  Server listening on 5201
  ---
  Accepted connection from 10.196.246.104, port 33732
  [  5] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33734
  [  8] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33736
  [ 10] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33738
  iperf3: error - unable to read from stream socket: Bad address
  ---
  Server listening on 5201
  ---
  [   91.083856] general protection fault:  [#1] SMP NOPTI
  [   91.084591] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 5.11.0-1028-oracle
  #31~20.04.1-Ubuntu
  [   91.085393] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.6.2
  06/01/2022
  [   91.086205] RIP: 0010:memcpy_erms+0x6/0x10
  [   91.086640] Code: cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03
  83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1  a4
  c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
  [   91.088559] RSP: 0018:a9c1408e4b60 EFLAGS: 00010282
  [   91.089105] RAX: 938cd8e48000 RBX: 1000 RCX:
  1000
  [   91.089843] RDX: 1000 RSI: bb62fcf4fd5bf3d6 RDI:
  938cd8e4

[Kernel-packages] [Bug 1980884] Re: ubuntu guest kernel panics when a sev guest with passthrough mlx5 VF is used

[Si-Wei Liu]

** Description changed:

  Guest kernel panic can be observed when Ubuntu SEV guest with mlx5 vfio-pci 
is started
  as iperf3 server using "iperf3 -s" and as soon as the client tries to connect
  with it.
  
  Steps to reproduce:
  
  HOST INFO
  Host type : OCI (Oracle Cloud) Bare-Metal Server
  Server/Machine: ORACLE SERVER E4-2c
  CPU model : AMD EPYC 7J13 64-Core Processor
  Architecture  : x86_64
  Host OS   : Oracle Linux Server release 7.9
  Host Kernel   : 5.4.17-2136.309.3.el7uek.x86_64 #2 SMP Tue Jun 14 21:58:29 
PDT 2022
- Hypervisor: QEMU emulator version 4.2.1 (qemu-4.2.1-17.1.oci.el7)
+ Hypervisor: QEMU emulator version 4.2.1 (qemu-4.2.1-17.1.el7)
  OVMF/AAVMF: OVMF-1.6.2-2.el7.noarch
- libiscsi  : libiscsi-1.19.0-1.oci.el7.x86_64
+ libiscsi  : libiscsi-1.19.0-1.el7.x86_64
  Guest Kernel  : 5.11.0-1028-ORACLE
  
  1) Start Ubuntu 20.04/18.04 SEV guest with vfio-pci:
  
  /usr/bin/qemu-system-x86_64 -machine q35 -name OL20.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol20.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
  -drive
  
file=/systest/atanveer/scripts/Ubuntu-20.04-2022.02.15-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.1 -qmp tcp:127.0.0.1:3334,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL20.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0
  
  2) Start a client guest OL/Ubuntu:
  
  /usr/bin/qemu-system-x86_64 -machine q35 -name OL18.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol18.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
  -drive
  
file=/systest/atanveer/scripts/Ubuntu-18.04-2022.02.13-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.2 -qmp tcp:127.0.0.1:,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL18.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0
  
  3) Flush iptables on both the VMs using "iptables -F"
  
  4) Start the iperf3 server on the first VM using "iperf3 -s"
  
  5) Start the iperf3 client on the second VM using "iperf3 -c  -4
  -f M -i 0 -t 70 -O 10 -P 64"
  
  The kernel panic is seen on the first VM i.e. Ubuntu 20.04 with iperf3 also
  showing "Bad Address" error.
  
  Console logs:
  
  root@ubuntu-20-04:~# iperf3 -s
  ---
  Server listening on 5201
  ---
  Accepted connection from 10.196.246.104, port 33732
  [  5] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33734
  [  8] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33736
  [ 10] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33738
  iperf3: error - unable to read from stream socket: Bad address
  ---
  Server listening on 5201
  ---
  [   91.083856] general protection fault:  [#1] SMP NOPTI
  [   91.084591] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 5.11.0-1028-oracle
  #31~20.04.1-Ubuntu
  [   91.085393] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.6.2
  06/01/2022
  [   91.086205] RIP: 0010:memcpy_erms+0x6/0x10
  [   91.086640] Code: cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03
  83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1  a4
  c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
  [   91.088559] RSP: 0018:a9c1408e4b60 EFLAGS: 00010282
  [   91.089105] RAX: 938cd8e48000 RBX: 1000 RCX:
  1000
  [   91.089843] RDX: 1000 RSI: bb62fcf4fd5bf3d6 RDI:
  938cd8e48000
  [   91.090578] RBP: a9c1408e4c00 R08: ef2745639200 R09:
  
  [   91.091309] R10: ef27456399c8 R11: 4209 R12:
  1000
  [   91.092043] R13: ef2745639200 R14: 1000 R15:
  0d558380
  [   91.092782] FS:  () GS:938df430

[Kernel-packages] [Bug 1980884] Re: ubuntu guest kernel panics when a sev guest with passthrough mlx5 VF is used

[Si-Wei Liu]

** Description changed:

  Guest kernel panic can be observed when Ubuntu SEV guest with mlx5 vfio-pci 
is started
  as iperf3 server using "iperf3 -s" and as soon as the client tries to connect
  with it.
  
  Steps to reproduce:
  
  HOST INFO
  Host type : OCI (Oracle Cloud) Bare-Metal Server
  Server/Machine: ORACLE SERVER E4-2c
  CPU model : AMD EPYC 7J13 64-Core Processor
  Architecture  : x86_64
  Host OS   : Oracle Linux Server release 7.9
  Host Kernel   : 5.4.17-2136.309.3.el7uek.x86_64 #2 SMP Tue Jun 14 21:58:29 
PDT 2022
  Hypervisor: QEMU emulator version 4.2.1 (qemu-4.2.1-17.1.oci.el7)
  OVMF/AAVMF: OVMF-1.6.2-2.el7.noarch
  libiscsi  : libiscsi-1.19.0-1.oci.el7.x86_64
  Guest Kernel  : 5.11.0-1028-ORACLE
  
- 
  1) Start Ubuntu 20.04/18.04 SEV guest with vfio-pci:
  
  /usr/bin/qemu-system-x86_64 -machine q35 -name OL20.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol20.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
- -fw_cfg name=opt/ovmf/OCI-ENABLE,string=0x1  -drive
+ -drive
  
file=/systest/atanveer/scripts/Ubuntu-20.04-2022.02.15-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.1 -qmp tcp:127.0.0.1:3334,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL20.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0
  
  2) Start a client guest OL/Ubuntu:
  
  /usr/bin/qemu-system-x86_64 -machine q35 -name OL18.04-uefi -enable-kvm
  -nodefaults -cpu host,+host-phys-bits -m 8G -smp 8,maxcpus=240 -monitor stdio
  -vnc 0.0.0.0:0,to=999 -vga std -drive
  
file=/usr/share/OVMF/OVMF_CODE.pure-efi.fd,index=0,if=pflash,format=raw,readonly
 -drive file=OVMF_VARS.pure-efi.fd.ol18.04,index=1,if=pflash,format=raw
  -device
  virtio-scsi-pci,id=virtio-scsi-pci0,disable-legacy=on,iommu_platform=true
- -fw_cfg name=opt/ovmf/OCI-ENABLE,string=0x1  -drive
+ -drive
  
file=/systest/atanveer/scripts/Ubuntu-18.04-2022.02.13-0-uefi-x86_64.qcow2,if=none,id=local_disk0,format=qcow2,media=disk
 -device
  ide-hd,drive=local_disk0,id=local_disk1,bootindex=0  -net none -device
  vfio-pci,host=:21:10.2 -qmp tcp:127.0.0.1:,server,nowait -serial
  telnet:127.0.0.1:,server,nowait  -D ./OL18.04-uefi.log -device
  virtio-rng-pci,disable-legacy=on,iommu_platform=true -object
  sev-guest,id=sev0,cbitpos=51,reduced-phys-bits=1 -machine
  memory-encryption=sev0
  
  3) Flush iptables on both the VMs using "iptables -F"
  
  4) Start the iperf3 server on the first VM using "iperf3 -s"
  
  5) Start the iperf3 client on the second VM using "iperf3 -c  -4
  -f M -i 0 -t 70 -O 10 -P 64"
  
  The kernel panic is seen on the first VM i.e. Ubuntu 20.04 with iperf3 also
  showing "Bad Address" error.
- 
  
  Console logs:
  
  root@ubuntu-20-04:~# iperf3 -s
  ---
  Server listening on 5201
  ---
  Accepted connection from 10.196.246.104, port 33732
  [  5] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33734
  [  8] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33736
  [ 10] local 10.196.247.88 port 5201 connected to 10.196.246.104 port 33738
  iperf3: error - unable to read from stream socket: Bad address
  ---
  Server listening on 5201
  ---
  [   91.083856] general protection fault:  [#1] SMP NOPTI
  [   91.084591] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 5.11.0-1028-oracle
  #31~20.04.1-Ubuntu
  [   91.085393] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.6.2
  06/01/2022
  [   91.086205] RIP: 0010:memcpy_erms+0x6/0x10
  [   91.086640] Code: cc cc cc cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03
  83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1  a4
  c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe
  [   91.088559] RSP: 0018:a9c1408e4b60 EFLAGS: 00010282
  [   91.089105] RAX: 938cd8e48000 RBX: 1000 RCX:
  1000
  [   91.089843] RDX: 1000 RSI: bb62fcf4fd5bf3d6 RDI:
  938cd8e48000
  [   91.090578] RBP: a9c1408e4c00 R08: ef2745639200 R09:
  
  [   91.091309] R10: ef27456399c8 R11: 4209 R12:
  1000
  [   91.092043] R13: ef2745639200 R14: 1000 R15:
  0d558380
  [   91.092782] FS:  () GS:938df430(

[Kernel-packages] [Bug 1825229] [NEW] request to supercede the interim changes for 1815268 with upstream commit 8065a779

[Si-Wei Liu]

Public bug reported:

The interm patch in LP# 1815268 was positioned as a way of mitigation to
the rename race condition as described in that bug. Now, the upstream
patch has been accepted and it eliminates the need of the delay. The
patch is now in staging tree and should be pulled into mainline soon:

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=8065a779f17e94536a1c4dcee4f9d88011672f97

Hence we request to back out the delay patch for 1815268 and instead
apply the upstream patch above.

** Affects: linux (Ubuntu)
 Importance: Undecided
 Status: New

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https://bugs.launchpad.net/bugs/1825229

Title:
  request to supercede the interim changes for 1815268  with upstream
  commit 8065a779

Status in linux package in Ubuntu:
  New

Bug description:
  The interm patch in LP# 1815268 was positioned as a way of mitigation
  to the rename race condition as described in that bug. Now, the
  upstream patch has been accepted and it eliminates the need of the
  delay. The patch is now in staging tree and should be pulled into
  mainline soon:

  
https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=8065a779f17e94536a1c4dcee4f9d88011672f97

  Hence we request to back out the delay patch for 1815268 and instead
  apply the upstream patch above.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1825229/+subscriptions

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[Kernel-packages] [Bug 1815268] Re: hot add VF to net_failover - could not rename interface '8' from 'eth0' to 'ens4': Device or resource busy

[Si-Wei Liu]

Note the patch attached is a tentative workaround that helps mitigate
the issue, but not intended to be a suggested fix. I've initiated a
thread in the Linux netdev mailing list for the resolution. Please find
the relevant thread starting at:

https://www.mail-archive.com/netdev@vger.kernel.org/msg286707.html

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https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 u

[Kernel-packages] [Bug 1815268] Re: hot add VF to net_failover - could not rename interface '8' from 'eth0' to 'ens4': Device or resource busy

[Si-Wei Liu]

Please find attached a patch (from Oracle Linux) that mitigates the race
with a tunable delay of 100ms.

** Patch added: 
"0001-net_failover-delay-taking-over-primary-device-to-acc.patch"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1815268/+attachment/5237749/+files/0001-net_failover-delay-taking-over-primary-device-to-acc.patch

-- 
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https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link

[Kernel-packages] [Bug 1815268] ProcInterrupts.txt

[Si-Wei Liu]

apport information

** Attachment added: "ProcInterrupts.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237190/+files/ProcInterrupts.txt

-- 
You received this bug notification because you are a member of Kernel
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Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'pa

[Kernel-packages] [Bug 1815268] PulseList.txt

[Si-Wei Liu]

apport information

** Attachment added: "PulseList.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237192/+files/PulseList.txt

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id' 
/l

[Kernel-packages] [Bug 1815268] UdevDb.txt

[Si-Wei Liu]

apport information

** Attachment added: "UdevDb.txt"
   https://bugs.launchpad.net/bugs/1815268/+attachment/5237193/+files/UdevDb.txt

-- 
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Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id' 
/lib/udev

[Kernel-packages] [Bug 1815268] CurrentDmesg.txt

[Si-Wei Liu]

apport information

** Attachment added: "CurrentDmesg.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237185/+files/CurrentDmesg.txt

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_i

[Kernel-packages] [Bug 1815268] WifiSyslog.txt

[Si-Wei Liu]

apport information

** Attachment added: "WifiSyslog.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237194/+files/WifiSyslog.txt

** Changed in: linux (Ubuntu)
   Status: Incomplete => Confirmed

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb

[Kernel-packages] [Bug 1815268] ProcModules.txt

[Si-Wei Liu]

apport information

** Attachment added: "ProcModules.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237191/+files/ProcModules.txt

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id'

[Kernel-packages] [Bug 1815268] Re: hot add VF to net_failover - could not rename interface '8' from 'eth0' to 'ens4': Device or resource busy

[Si-Wei Liu]

apport information

** Tags added: apport-collected xenial

** Description changed:

  Host has a QEMU/KVM setup with standby virtio-net [1]:
  
  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on -machine
  pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off -smp
  4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on
  
  Guest is loaded with Xenial Xerus (16.04.5),
  
  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 
  
  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:
  
  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  
  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:
  
  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)
  
  VF now shows up in guest as "eth0" instead of the expected "ens4":
  
  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$
  
  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",
  
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id' 
/lib/udev/rules.d/80-net-setup-link.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 
'net_setup_link' /lib/udev/rules.d/80-net-setup-link.rules:9
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: Config file 
/lib/systemd/network/99-default.link applies to device eth0
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: NAME 'ens4' 
/lib/udev/rules.d/80-net-setup-li

[Kernel-packages] [Bug 1815268] Lspci.txt

[Si-Wei Liu]

apport information

** Attachment added: "Lspci.txt"
   https://bugs.launchpad.net/bugs/1815268/+attachment/5237188/+files/Lspci.txt

-- 
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https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id' 
/lib/udev/r

[Kernel-packages] [Bug 1815268] ProcCpuinfoMinimal.txt

[Si-Wei Liu]

apport information

** Attachment added: "ProcCpuinfoMinimal.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237189/+files/ProcCpuinfoMinimal.txt

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT bui

[Kernel-packages] [Bug 1815268] HookError_generic.txt

[Si-Wei Liu]

apport information

** Attachment added: "HookError_generic.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237186/+files/HookError_generic.txt

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT built

[Kernel-packages] [Bug 1815268] CRDA.txt

[Si-Wei Liu]

apport information

** Attachment added: "CRDA.txt"
   https://bugs.launchpad.net/bugs/1815268/+attachment/5237184/+files/CRDA.txt

-- 
You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id' 
/lib/udev/rul

[Kernel-packages] [Bug 1815268] IwConfig.txt

[Si-Wei Liu]

apport information

** Attachment added: "IwConfig.txt"
   
https://bugs.launchpad.net/bugs/1815268/+attachment/5237187/+files/IwConfig.txt

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1815268

Title:
  hot add VF to net_failover - could not rename interface '8' from
  'eth0' to 'ens4': Device or resource busy

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Host has a QEMU/KVM setup with standby virtio-net [1]:

  # qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on
  -machine pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off
  -smp 4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
  order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
  tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
  pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

  Guest is loaded with Xenial Xerus (16.04.5),

  vsbalakr@ubuntu-16:~$ uname -a
  Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
  vsbalakr@ubuntu-16:~$ cat /proc/version_signature
  Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
  vsbalakr@ubuntu-16:~$ cat /etc/os*release
  NAME="Ubuntu"
  VERSION="16.04.5 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.5 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/";
  SUPPORT_URL="http://help.ubuntu.com/";
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial
  vsbalakr@ubuntu-16:~$ 

  ens3 is the master interface of net_failover, while ens3nsby is its
  standby slave [2]:

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2154sec preferred_lft 2154sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
  valid_lft forever preferred_lft forever

  Now we hot plug a Virtual Function (with MAC set to same address
  d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

  (qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
  (qemu)

  VF now shows up in guest as "eth0" instead of the expected "ens4":

  vsbalakr@ubuntu-16:~$ ip a sh
  1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
  link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  inet 127.0.0.1/8 scope host lo
 valid_lft forever preferred_lft forever
  inet6 ::1/128 scope host
 valid_lft forever preferred_lft forever
  2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
 valid_lft forever preferred_lft forever
  inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
  inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  3: ens3nsby:  mtu 1500 qdisc pfifo_fast 
master ens3 state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
 valid_lft 2072sec preferred_lft 2072sec
  inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
 valid_lft forever preferred_lft forever
  6: eth0:  mtu 1500 qdisc mq master ens3 
state UP group default qlen 1000
  link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
  vsbalakr@ubuntu-16:~$

  /var/log/syslog shows that renaming to "ens4" had failed because of
  "Device or resource busy",

  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC 
Link is Up 10 Gbps
  Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
  Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id' 
/lib

[Kernel-packages] [Bug 1815268] [NEW] hot add VF to net_failover - could not rename interface '8' from 'eth0' to 'ens4': Device or resource busy

[Si-Wei Liu]

Public bug reported:

Host has a QEMU/KVM setup with standby virtio-net [1]:

# qemu-system-x86_64 -name guest=ubuntu-xenial,debug-threads=on -machine
pc,accel=kvm,usb=off -cpu host -m 4096 -realtime mlock=off -smp
4,sockets=1,cores=2,threads=2 -monitor stdio -vnc :1 -boot
order=n,menu=on -serial telnet:127.0.0.1:4567,server -netdev
tap,fd=20,id=hostnet0,vhost=on,vhostfd=21 -device virtio-net-
pci,netdev=hostnet0,id=net0,mac=d6:36:08:7f:b4:d9,standby=on

Guest is loaded with Xenial Xerus (16.04.5),

vsbalakr@ubuntu-16:~$ uname -a
Linux ubuntu-16 4.15.0-1007-oracle #9~16.04.1-Ubuntu SMP Wed Dec 12 19:49:55 
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
vsbalakr@ubuntu-16:~$ cat /proc/version_signature
Ubuntu 4.15.0-1007.9~16.04.1-oracle 4.15.18
vsbalakr@ubuntu-16:~$ cat /etc/os*release
NAME="Ubuntu"
VERSION="16.04.5 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.5 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/";
SUPPORT_URL="http://help.ubuntu.com/";
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/";
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial
vsbalakr@ubuntu-16:~$ 

ens3 is the master interface of net_failover, while ens3nsby is its
standby slave [2]:

vsbalakr@ubuntu-16:~$ ip a sh
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
   valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
   valid_lft forever preferred_lft forever
2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
   valid_lft forever preferred_lft forever
inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
valid_lft forever preferred_lft forever
3: ens3nsby:  mtu 1500 qdisc pfifo_fast master 
ens3 state UP group default qlen 1000
link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
   valid_lft 2154sec preferred_lft 2154sec
inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
valid_lft forever preferred_lft forever

Now we hot plug a Virtual Function (with MAC set to same address
d6:36:08:7f:b4:d9 in prior) into the guest, via QEMU HMP console:

(qemu) device_add vfio-pci,host=02:10.1,id=hostdev_vf0
(qemu)

VF now shows up in guest as "eth0" instead of the expected "ens4":

vsbalakr@ubuntu-16:~$ ip a sh
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group 
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
   valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
   valid_lft forever preferred_lft forever
2: ens3:  mtu 1500 qdisc noqueue state UP 
group default qlen 1000
link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
inet 10.211.15.21/21 brd 10.211.15.255 scope global ens3
   valid_lft forever preferred_lft forever
inet6 2606:b400:400:3451:61b8:3bbd:dba3:7f93/64 scope global temporary 
dynamicvalid_lft 604753sec preferred_lft 86209sec
inet6 2606:b400:400:3451:d436:8ff:fe7f:b4d9/64 scope global mngtmpaddr 
dynamicvalid_lft 2591959sec preferred_lft 604759sec
inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
   valid_lft forever preferred_lft forever
3: ens3nsby:  mtu 1500 qdisc pfifo_fast master 
ens3 state UP group default qlen 1000
link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
inet 10.211.15.21/21 brd 10.211.15.255 scope global dynamic ens3nsby
   valid_lft 2072sec preferred_lft 2072sec
inet6 fe80::d436:8ff:fe7f:b4d9/64 scope link
   valid_lft forever preferred_lft forever
6: eth0:  mtu 1500 qdisc mq master ens3 state 
UP group default qlen 1000
link/ether d6:36:08:7f:b4:d9 brd ff:ff:ff:ff:ff:ff
vsbalakr@ubuntu-16:~$

/var/log/syslog shows that renaming to "ens4" had failed because of
"Device or resource busy",

Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.231623] ixgbevf :00:04.0: NIC Link 
is Up 10 Gbps
Feb  8 18:24:05 ubuntu-16 kernel: [ 5270.233188] IPv6: ADDRCONF(NETDEV_UP): 
eth0: link is not ready
Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN 'ifupdown-hotplug' 
/lib/udev/rules.d/80-ifupdown.rules:5
Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'path_id' 
/lib/udev/rules.d/80-net-setup-link.rules:5
Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: IMPORT builtin 'net_setup_link' 
/lib/udev/rules.d/80-net-setup-link.rules:9
Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: Config file 
/lib/systemd/network/99-default.link applies to device eth0
Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: NAME 'ens4' 
/lib/udev/rules.d/80-net-setup-link.rules:11
Feb  8 18:24:05 ubuntu-16 systemd-udevd[2340]: RUN '/lib/systemd/systemd-sysctl 
--prefix=/net/ipv4/conf/$name --prefix=/net/ipv4/neigh/$name 
--prefix=/net/ipv6/conf/$name --prefix=/net/ipv6/neigh/$name' 
/lib/udev/rules.d/99-systemd.rules: