kernel-packages team mailing list archive

["Stephen A. Zarkos" <1498206@xxxxxxxxxxxxxxxxxx>]

HI Joseph,

Can we please raise the priority of this to get it into Trusty and Vivid
as soon as possible?  We are seeing more repros of this issue on Azure.

Thanks,
Steve

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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:
  In Progress
Status in linux source package in Vivid:
  In Progress
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.

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