Public bug reported:

Description: During SRU Testing of various Azure Instances, there will
be some cases where the instance will not respond following a system
reboot.  SRU Testing only restarts a giving instance once, after it
preps all of the necessary files to-be-tested.

Series: Disco
Instance Size: Basic_A3
Region: (Default) US-WEST-2
Kernel Version: 4.18.0-1013-azure #13-Ubuntu SMP Thu Feb 28 22:54:16 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux

I initiated a series of tests which rebooted Azure Cloud instances 50
times. During the 49th Reboot, an Instance failed to return from a
reboot.. Upon grabbing the console output the following was seen
scrolling endlessly. I have seen this failure in cases where the
instance only restarted a handful of times >5

[    84.247704]hyperv_fb: unable to send packet via vmbus
[    84.247704]hyperv_fb: unable to send packet via vmbus
[    84.247704]hyperv_fb: unable to send packet via vmbus
[    84.247704]hyperv_fb: unable to send packet via vmbus
[    84.247704]hyperv_fb: unable to send packet via vmbus
[    84.247704]hyperv_fb: unable to send packet via vmbus
[    84.247704]hyperv_fb: unable to send packet via vmbus
[    84.247704]hyperv_fb: unable to send packet via vmbus

** Affects: linux-azure (Ubuntu)
     Importance: Undecided
     Assignee: Colin Ian King (colin-king)
         Status: New

** Description changed:

  Description: During SRU Testing of various Azure Instances, there will
  be some cases where the instance will not respond following a system
  reboot.  SRU Testing only restarts a giving instance once, after it
  preps all of the necessary files to-be-tested.
+ 
+ Series: Disco
+ Instance Size: Basic_A3
+ Region: (Default) US-WEST-2
+ Kernel Version: 4.18.0-1013-azure #13-Ubuntu SMP Thu Feb 28 22:54:16 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux
  
  I initiated a series of tests which rebooted Azure Cloud instances 50
  times. During the 49th Reboot, an Instance failed to return from a
  reboot.. Upon grabbing the console output the following was seen
  scrolling endlessly. I have seen this failure in cases where the
  instance only restarted a handful of times >5
  
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus

** Changed in: linux-azure (Ubuntu)
     Assignee: (unassigned) => Colin Ian King (colin-king)

-- 
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Packages, which is subscribed to linux-azure in Ubuntu.
https://bugs.launchpad.net/bugs/1822133

Title:
  Azure Instance never recovered during series of instance reboots.

Status in linux-azure package in Ubuntu:
  New

Bug description:
  Description: During SRU Testing of various Azure Instances, there will
  be some cases where the instance will not respond following a system
  reboot.  SRU Testing only restarts a giving instance once, after it
  preps all of the necessary files to-be-tested.

  Series: Disco
  Instance Size: Basic_A3
  Region: (Default) US-WEST-2
  Kernel Version: 4.18.0-1013-azure #13-Ubuntu SMP Thu Feb 28 22:54:16 UTC 2019 
x86_64 x86_64 x86_64 GNU/Linux

  I initiated a series of tests which rebooted Azure Cloud instances 50
  times. During the 49th Reboot, an Instance failed to return from a
  reboot.. Upon grabbing the console output the following was seen
  scrolling endlessly. I have seen this failure in cases where the
  instance only restarted a handful of times >5

  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus
  [    84.247704]hyperv_fb: unable to send packet via vmbus

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