This bit me tonight on a few days old 18.04 VM with stock kernel. So far I can not get back in with reboot or redeploy to upgrade the kernel.
-- You received this bug notification because you are a member of Kernel 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: In Progress 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1822133/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
