[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-12-11 Thread Joseph Salisbury 
** Changed in: linux (Ubuntu)
   Status: Triaged => Fix Released

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

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Vivid:
  Fix Released

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-30 Thread Launchpad Bug Tracker 
This bug was fixed in the package linux - 3.19.0-37.42

---
linux (3.19.0-37.42) vivid; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
- LP: #1518406

  [ K. Y. Srinivasan ]

  * SAUCE: Drivers: hv: vmbus: Fix a Host signaling bug
- LP: #1508706

 -- Kamal Mostafa   Fri, 20 Nov 2015 09:49:10 -0800

** Changed in: linux (Ubuntu Vivid)
   Status: Fix Committed => Fix Released

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Fix Released

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-30 Thread Joshua R. Poulson 
We've done broad testing on this kernel and it looks good, thanks!

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-25 Thread Ovidiu Rusu 
I've tested this version of kernel from proposed: 3.19.0-37-generic and
everything works good.

** Tags removed: verification-needed-vivid
** Tags added: verification-done-vivid

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-24 Thread Luis Henriques 
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-vivid

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-23 Thread Luis Henriques 
** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
   Status: New

** Changed in: linux (Ubuntu Vivid)
   Status: New => Fix Committed

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-20 Thread K Y Srinivasan 
Yes, I submitted v2 version of the patch yesterday. The two versions are
functionally equivalent and obviously I would prefer you pick up the
second version. However if the kernel is built and ready to go, I would
go with the first version. Andy is right in that there will be one more
patch that will use the functionality exposed here but that will be in
netvsc code and that is not a correctness issue. I want this patch to be
applied to stable and the patch could not be more than 100 lines. Once
Greg commits this patch, I will be submitting the follow on patch in
netvsc.

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-20 Thread Kamal Mostafa 
The v1 version of KY's patch has been applied to Vivid[0] and is
building now as (3.19.0-37.42).  We intend to replace it with the
mainline version in the future, once the dust settles.

[0] http://kernel.ubuntu.com/git/ubuntu/ubuntu-vivid.git/commit/?h
=master-next=0b599c6174684f18f8bd635cb94f483c7682c4f8

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-20 Thread Bryan Quigley 
Got another confirmation that the patch (first one) fixes the issue.

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-19 Thread Jay Vosburgh 
SRU Justification:

Impact:

Bug causes easily reproducible freeze of networking on affected
systems when under moderate to high network load.  Ordinary benchmark
tools such as iperf induce the problem without difficulty.  Affected
systems are virtual machine instances running on Azure, utilizing the
hv_netvsc network device driver.

Fix:

Fix is to apply patch provided by Microsoft:

http://marc.info/?l=linux-kernel=144787522532687=2

Testcase:

Tested as described in Bug Description.

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-18 Thread Jay Vosburgh 
We are testing this patch immediately (overnight US time) and will
report our results as soon as they are available

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-18 Thread Stephen A. Zarkos 
KY has pushed a patch to LKML that resolves this issue:
https://lkml.org/lkml/2015/11/18/690

This patch needs to be applied to the Vivid kernel and beyond.  This is
a critical patch, can you please take this patch as sauce for now so we
can get it out as quickly as possible?

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https://bugs.launchpad.net/bugs/1508706

Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-18 Thread Jay Vosburgh 
I have tested the patch referenced in comment #5 and it appears to
resolve the network hang.

I first built and tested the Ubuntu LTS 3.19.0-31.36~14.04.1 kernel and
reproduced the issue using the methodology described in the original bug
description.  This is commit

commit 15e42c329445b4e0f0aecefc39e205c44755c2ba
Author: Luis Henriques 
Date:   Thu Oct 8 10:26:57 2015 +0100

UBUNTU: Ubuntu-lts-3.19.0-31.36~14.04.1

in the lts-backport-vivid branch of git://kernel.ubuntu.com/ubuntu
/ubuntu-trusty.git

I then applied the referenced patch and tested again and was unable to
reproduce the issue after roughly an hour of testing.

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-09 Thread Alex Ng 
Hi Jay,

Does this issue occur even when VXLAN is not configured between the two
instances?

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-09 Thread Jay Vosburgh 
Yes, it did, although it seemed to be easier to reproduce with vxlan
configured.

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-05 Thread Joshua R. Poulson 
We are investigating this report and will update the bug when we know
more.

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Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-11-02 Thread Joseph Salisbury 
** Tags added: kernel-da-key kernel-hyper-v

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

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https://bugs.launchpad.net/bugs/1508706

Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Triaged

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1508706] Re: Networking hangs on azure using hv_netvsc; bisected

2015-10-24 Thread Christopher M. Penalver 
** Tags added: bisect-done

** Tags added: kernel-bug-exists-upstream

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

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https://bugs.launchpad.net/bugs/1508706

Title:
  Networking hangs on azure using hv_netvsc; bisected

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  
  Running Ubuntu instances on azure, testing basic networking between two 
instances.  This involves configuring VXLAN between the two instances and 
running iperf and rsync of the kernel tree between the instances, e.g.,

  ip link add vxlan0 type vxlan id 999 local 10.88.0.12 remote 10.88.0.11 dev 
eth0
  ip l set vxlan0 up
  ip addr add 242.0.0.12/8 dev vxlan0

  After some time (sometimes instantly, sometimes up to 30 minutes of
  activity), the networking will hang.  This hang takes two forms:  a
  complete loss of connectivity (all network, even the ssh session used
  to log in), or just a loss of connectivity between instances (the ssh
  session remains active).  Sometimes for the latter case, the ssh
  session will then later hang.

  This first appeared when testing with the Ubuntu 3.19 kernel, and I
  subsequently bisected this to:

  commit effa2012d207f78cbc5a8360e62d420a8860b7e9
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  BugLink: http://bugs.launchpad.net/bugs/1454892

  Based on the information given to this driver (via the xmit_more skb 
flag),
  we can defer signaling the host if more packets are on the way. This will 
help
  make the host more efficient since it can potentially process a larger 
batch of
  packets. Implement this optimization.

  Signed-off-by: K. Y. Srinivasan 
  Signed-off-by: David S. Miller 
  Acked-by: Tim Gardner 
  Acked-by: Brad Figg 
  Signed-off-by: Brad Figg 

  I also tested the mainline kernel (net-next); it fails with the
  equivalent commit:

  commit 82fa3c776e5abba7ed6e4b4f4983d14731c37d6a
  Author: KY Srinivasan 
  Date:   Mon May 11 15:39:46 2015 -0700

  hv_netvsc: Use the xmit_more skb flag to optimize signaling the
  host

  For both kernel trees, I also tested the prior commit and it did not
  exhibit the failure after many hours.  For ubuntu, this was

  commit a4aeb290bd75af5e16a6144a418291476ac6140c
  Author: K. Y. Srinivasan 
  Date:   Wed Mar 18 12:29:29 2015 -0700

  Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()

  and for mainline it was

  commit 9eea92226407e7a117ef1ceef45380ebd000a0e2
  Author: Alexei Starovoitov 
  Date:   Mon May 11 15:19:48 2015 -0700

  pktgen: fix packet generation

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1508706/+subscriptions

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