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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I started a kernel bisect between 3.16.0-46  and v3.16.0-48. The kernel
bisect will require testing of about 5 test kernels.

I built the first test kernel, up to the following commit:
0875e364f729b44ad8b0e196e04c2595a2f9bb51

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1491957

Can you test that kernel and report back if it has the bug or not?  I
will build the next test kernel based on your test results.

Thanks in advance

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https://bugs.launchpad.net/bugs/1491957

Title:
  3.16.0.48 kernel in hyper-v cause hv_netvsc problem

Status in linux-lts-utopic package in Ubuntu:
  Confirmed
Status in linux-lts-utopic source package in Trusty:
  Confirmed

Bug description:
  I have an Ubuntu 14.04 LTS in Hyper-V. It works well. Today I apt
  upgrade the kernel from 3.16.0.46 to 3.16.0.48 and after reboot, I
  have network connection problems, and have a lot of error message on
  screen like the above ones.

  Sep  3 18:48:07 RailGun kernel: [   71.437967] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2068)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.438276] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2068)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.438596] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2069)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.439016] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2069)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.439434] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2069)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.439847] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2069)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.440155] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2069)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.465593] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206a)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.466165] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206a)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.466827] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206a)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.467508] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206a)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.468056] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206a)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.474507] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206b)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.474998] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206b)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.475419] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206b)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.475833] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206b)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.476145] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206b)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.483356] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206c)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.483823] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206c)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.484266] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206c)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.484683] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206c)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.484993] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206c)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.491738] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206d)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.492223] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206d)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.492645] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206d)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.493060] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206d)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.493369] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206d)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.493689] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206e)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.494109] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206e)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.494527] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206e)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.494941] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206e)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.495249] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206e)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.509010] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206f)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.509467] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206f)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.509892] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206f)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.510308] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206f)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.510617] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 206f)...give up retrying
  Sep  3 18:48:07 RailGun kernel: [   71.510938] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2070)...retrying 1
  Sep  3 18:48:07 RailGun kernel: [   71.511358] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2070)...retrying 2
  Sep  3 18:48:07 RailGun kernel: [   71.511828] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2070)...retrying 3
  Sep  3 18:48:07 RailGun kernel: [   71.512245] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2070)...retrying 4
  Sep  3 18:48:07 RailGun kernel: [   71.512669] hv_netvsc vmbus_0_16 eth0: unable to send receive completion pkt (tid 2070)...give up retrying

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