kernel-packages team mailing list archive

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

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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https://bugs.launchpad.net/bugs/1498206

Title:
  Fix CPU lockup on Hyper-V/Azure

Status in linux package in Ubuntu:
  Incomplete

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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