** Also affects: bridge-utils (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Yakkety)
   Importance: High
       Status: Confirmed

** Also affects: bridge-utils (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** No longer affects: linux (Ubuntu Yakkety)

-- 
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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1616107

Title:
  Kernel oops + system freeze on network-bridge shutdown

Status in bridge-utils package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Confirmed
Status in bridge-utils source package in Xenial:
  New
Status in linux source package in Xenial:
  Confirmed
Status in bridge-utils source package in Yakkety:
  New

Bug description:
  A Kernel oops leaves Ubuntu 16.04 unusable when a network bridge is
  brought down on a HPE 530SFP+ 10GBit NIC that uses bnx2x as a driver.
  This error does not appear in Ubuntu 14.04 however.

  The error is reproducible whenever issuing the commands "shutdown",
  "service networking stop" or "brctl delbr br0". Manually creating the
  bridge and subsequently bringing it down results in the same error.

  /var/log/kern.log:
  [...]
  Aug 23 15:09:46 base1 kernel: [  617.996677] device ens1f0 left promiscuous 
mode
  Aug 23 15:09:46 base1 kernel: [  617.996699] br0: port 1(ens1f0) entered 
disabled state
  Aug 23 15:09:46 base1 kernel: [  617.996730] BUG: unable to handle kernel 
NULL pointer dereference at 00000000000000d2
  Aug 23 15:09:46 base1 kernel: [  618.008306] IP: [<ffffffffc0486d78>] 
__vlan_flush+0x18/0x60 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.020549] PGD 10374c0067 PUD 1033927067 
PMD 0
  Aug 23 15:09:46 base1 kernel: [  618.032773] Oops: 0002 [#1] SMP
  Aug 23 15:09:46 base1 kernel: [  618.044434] Modules linked in: nls_iso8859_1 
ipmi_ssif intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel 
kvm irqbypass sb_edac edac_core joydev bridge stp llc input_leds hpilo lpc_ich 
ioatdma ipmi_si ipmi_msghandler shpchp mac_hid acpi_power_meter ib_iser rdma_cm 
iw_cm ib_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi 
scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov 
async_memcpy async_pq async_xor async_tx xor raid6_pq raid0 multipath linear 
raid1 hid_generic crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw 
gf128mul glue_helper ablk_helper cryptd igb usbhid hid bnx2x dca ahci 
i2c_algo_bit vxlan libahci ip6_udp_tunnel udp_tunnel ptp pps_core mdio 
libcrc32c wmi fjes
  Aug 23 15:09:46 base1 kernel: [  618.058563] CPU: 3 PID: 4049 Comm: brctl Not 
tainted 4.4.0-34-generic #53-Ubuntu
  Aug 23 15:09:46 base1 kernel: [  618.058564] Hardware name: HP ProLiant DL120 
Gen9/ProLiant DL120 Gen9, BIOS P86 05/05/2016
  Aug 23 15:09:46 base1 kernel: [  618.058574] task: ffff881030676040 ti: 
ffff8810341e4000 task.ti: ffff8810341e4000
  Aug 23 15:09:46 base1 kernel: [  618.058576] RIP: 0010:[<ffffffffc0486d78>]  
[<ffffffffc0486d78>] __vlan_flush+0x18/0x60 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.058754] RSP: 0018:ffff8810341e7d68  
EFLAGS: 00010206
  Aug 23 15:09:46 base1 kernel: [  618.058769] RAX: 0000000000000000 RBX: 
0000000000000000 RCX: 0000000000000000
  Aug 23 15:09:46 base1 kernel: [  618.058774] RDX: ffff881038470848 RSI: 
0000000000000000 RDI: 0000000000000000
  Aug 23 15:09:46 base1 kernel: [  618.058775] RBP: ffff8810341e7d78 R08: 
0000000000000000 R09: ffffffff8170d949
  Aug 23 15:09:46 base1 kernel: [  618.058776] R10: ffffea0000d61340 R11: 
ffff8810329d2c00 R12: 00000000000000c0
  Aug 23 15:09:46 base1 kernel: [  618.058777] R13: ffff881030044000 R14: 
ffff881038470840 R15: 0000000000000000
  Aug 23 15:09:46 base1 kernel: [  618.058782] FS:  00007f9aebc94700(0000) 
GS:ffff88107fcc0000(0000) knlGS:0000000000000000
  Aug 23 15:09:46 base1 kernel: [  618.058789] CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
  Aug 23 15:09:46 base1 kernel: [  618.058790] CR2: 00000000000000d2 CR3: 
000000102fe83000 CR4: 00000000001406e0
  Aug 23 15:09:46 base1 kernel: [  618.058802] Stack:
  Aug 23 15:09:46 base1 kernel: [  618.058806]  0000000000000000 
ffff8810356a4c00 ffff8810341e7d98 ffffffffc0489258
  Aug 23 15:09:46 base1 kernel: [  618.058822]  ffff8810356a4c00 
ffff881038470840 ffff8810341e7dc0 ffffffffc0479bd8
  Aug 23 15:09:46 base1 kernel: [  618.058825]  ffff881038470838 
ffff881038470848 ffff881038470000 ffff8810341e7df8
  Aug 23 15:09:46 base1 kernel: [  618.058827] Call Trace:
  Aug 23 15:09:46 base1 kernel: [  618.058863]  [<ffffffffc0489258>] 
nbp_vlan_flush+0x28/0x65 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.058870]  [<ffffffffc0479bd8>] 
del_nbp+0x98/0x130 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.058889]  [<ffffffffc0479cb2>] 
br_dev_delete+0x42/0xb0 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.058895]  [<ffffffffc0479dea>] 
br_del_bridge+0x4a/0x70 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.058911]  [<ffffffffc047b4e3>] 
br_ioctl_deviceless_stub+0x153/0x230 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.058984]  [<ffffffff81345533>] ? 
security_file_alloc+0x33/0x50
  Aug 23 15:09:46 base1 kernel: [  618.059095]  [<ffffffff81704625>] 
sock_ioctl+0x215/0x290
  Aug 23 15:09:46 base1 kernel: [  618.059121]  [<ffffffff81220c3f>] 
do_vfs_ioctl+0x29f/0x490
  Aug 23 15:09:46 base1 kernel: [  618.059223]  [<ffffffff8106b554>] ? 
__do_page_fault+0x1b4/0x400
  Aug 23 15:09:46 base1 kernel: [  618.059264]  [<ffffffff8122b525>] ? 
fd_install+0x25/0x30
  Aug 23 15:09:46 base1 kernel: [  618.059266]  [<ffffffff81220ea9>] 
SyS_ioctl+0x79/0x90
  Aug 23 15:09:46 base1 kernel: [  618.059359]  [<ffffffff8182def2>] 
entry_SYSCALL_64_fastpath+0x16/0x71
  Aug 23 15:09:46 base1 kernel: [  618.059369] Code: 1b c1 c0 e9 30 ff ff ff 90 
66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 53 49 89 fc 31 
c0 49 81 c4 c0 00 00 00 <66> 89 87 d2 00 00 00 48 8b 87 c0 00 00 00 49 39 c4 48 
8b 08 74
  Aug 23 15:09:46 base1 kernel: [  618.059514] RIP  [<ffffffffc0486d78>] 
__vlan_flush+0x18/0x60 [bridge]
  Aug 23 15:09:46 base1 kernel: [  618.059522]  RSP <ffff8810341e7d68>
  Aug 23 15:09:46 base1 kernel: [  618.059523] CR2: 00000000000000d2
  Aug 23 15:09:46 base1 kernel: [  618.060149] ---[ end trace f915551f71712a3d 
]---
  [...]

  dmesg | grep bnx2x:
  [    3.523820] bnx2x: QLogic 5771x/578xx 10/20-Gigabit Ethernet Driver bnx2x 
1.712.30-0 (2014/02/10)
  [    3.544982] bnx2x 0000:03:00.0: msix capability found
  [    3.549671] bnx2x 0000:03:00.0: part number 0-0-0-0
  [    3.682788] bnx2x 0000:03:00.1: msix capability found
  [    3.685014] bnx2x 0000:03:00.1: part number 0-0-0-0
  [    4.588510] bnx2x 0000:03:00.0 ens1f0: renamed from eth1
  [    4.688509] bnx2x 0000:03:00.1 ens1f1: renamed from eth2
  [   10.104242] bnx2x 0000:03:00.0 ens1f0: failed to initialize vlan filtering 
on this port
  [   10.713654] bnx2x 0000:03:00.0 ens1f0: using MSI-X  IRQs: sp 47  fp[0] 50 
... fp[5] 55
  [   11.946057] bnx2x 0000:03:00.0 ens1f0: NIC Link is Up, 10000 Mbps full 
duplex, Flow control: ON - receive & transmit

  /etc/network/interfaces:
  # The loopback network interface
  auto lo
  iface lo inet loopback

  # The primary 10GbE network interface
  auto ens1f0
  iface ens1f0 inet manual

  # The secondary 10GbE network interface
  # auto ens1f1
  # iface ens1f1 inet manual

  # Bridged network interface
  auto br0
  iface br0 inet static
    address 192.168.xxx.xxx
    netmask 255.255.255.0
    network 192.168.xxx.0
    broadcast 192.168.xxx.255
    gateway 192.168.xxx.xxx
    dns-nameservers 192.168.xxx.xxx 192.168.xxx.xxx
    dns-search xxx
    bridge_ports ens1f0
    bridge_hello 2
    bridge_fd 9
    bridge_maxage 12
    bridge_stp off

  lsb_release -rd:
  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04

  cat /proc/version_signature:
  Ubuntu 4.4.0-34.53-generic 4.4.15

  apt-cache policy bridge-utils:
  bridge-utils:
    Installed: 1.5-9ubuntu1
    Candidate: 1.5-9ubuntu1
    Version table:
   *** 1.5-9ubuntu1 500
          500 http://de.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  ---
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Dependencies:
   gcc-6-base 6.0.1-0ubuntu1
   libc6 2.23-0ubuntu3
   libgcc1 1:6.0.1-0ubuntu1
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-08-22 (1 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  Package: linux
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
  Tags:  xenial
  Uname: Linux 4.4.0-34-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True
  ---
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Dependencies:
   gcc-6-base 6.0.1-0ubuntu1
   libc6 2.23-0ubuntu3
   libgcc1 1:6.0.1-0ubuntu1
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2016-08-22 (1 days ago)
  InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  Package: linux
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
  Tags:  xenial
  Uname: Linux 4.4.0-34-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
  _MarkForUpload: True

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