This bug was fixed in the package linux - 3.19.0-37.42
---------------
linux (3.19.0-37.42) vivid; urgency=low
[ Kamal Mostafa ]
* Release Tracking Bug
- LP: #1518406
[ K. Y. Srinivasan ]
* SAUCE: Drivers: hv: vmbus: Fix a Host signaling bug
- LP: #1508706
-- Kamal Mostafa <ka...@canonical.com> Fri, 20 Nov 2015 09:49:10 -0800
** Changed in: linux (Ubuntu Vivid)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1498206
Title:
Fix CPU lockup on Hyper-V/Azure
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Trusty:
Fix Committed
Status in linux source package in Vivid:
Fix Released
Status in linux source package in Wily:
Fix Released
Bug description:
Description of problem:
Large sized VMs with 32 VCPUs and more than 100G memory sometimes hang at
boot, and the console keeps printing logs like "soft lockup - CPU#14 stuck for
23s!"
This particular issue can be resolved with the following patch upstream:
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/arch/x86/kernel/cpu?id=88c9281a9fba67636ab26c1fd6afbc78a632374f
Repro rate is low. To repro, provision a larger VM (i.e. G5 VM on
Azure) and reboot many times, monitoring the console until the "soft
lockup - CPU" error is seen.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1498206/+subscriptions
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