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[Bug 1491957] Re: 3.16.0.48 kernel in hyper-v cause hv_netvsc problem

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The commits that caused this bug were introduced by the fixes for bug
1454892.

I've created a new test kernel for bug 1454892, but I would like to
ensure it does not introduce this regression again.  Could folks
affected by this bug test my new test kernel?  It can be downloaded
from:

http://kernel.ubuntu.com/~jsalisbury/lp1454892/lts-backport-utopic/

Note, with this test kernel you would need to install both the linux-
image and linux-image-extra .deb packages.

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:
  Fix Released
Status in linux-lts-utopic source package in Trusty:
  Fix Released

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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