** Changed in: linux-azure (Ubuntu)
Status: In Progress => Incomplete
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https://bugs.launchpad.net/bugs/1822133
Title:
Azure Instance never recovered during series of instance reboots.
Status in linux-azure package in Ubuntu:
Incomplete
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
In another test attempt I saw the following failure:
ERROR ExtHandler /proc/net/route contains no routes
ERROR ExtHandler /proc/net/route contains no routes
ERROR ExtHandler /proc/net/route contains no routes
ERROR ExtHandler /proc/net/route contains no routes
ERROR ExtHandler /proc/net/route contains no routes
ERROR ExtHandler /proc/net/route contains no routes
ERROR ExtHandler /proc/net/route contains no routes
Both of these failures broke networking, Both of these failures were seen at
least twice to three times, thus may explain why in some cases we never recover
from an instance reboot.
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