Patch submitted: https://lists.ubuntu.com/archives/kernel-
team/2022-November/134828.html

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https://bugs.launchpad.net/bugs/1996806

Title:
  Azure: Jammy fio test causes panic

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Jammy:
  In Progress

Bug description:
  SRU Justification

  [Impact]

  During Storage performance tests, 16 disks are attached and fio is
  ran. The fio command does not consistently result in a kernel panic,
  but the test runs fio enough times to result in consistent kernel
  panic. The panic is most often observed on instances with many cores
  and disks.

  [Test Case]

  Using an instance with 96 cores and 16 disks:

  sudo fio --ioengine=libaio --bs=1024K
  
--filename=/dev/sda:/dev/sdb:/dev/sdc:/dev/sdd:/dev/sde:/dev/sdf:/dev/sdg:/dev/sdh:/dev/sdi:/dev/sdj:/dev/sdk:/dev/sdl:/dev/sdm:/dev/sdn:/dev/sdo:/dev/sdp
  --readwrite=read --runtime=120 --iodepth=32 --numjob=96
  --name=iteration23 --direct=1 --size=8192M --group_reporting
  --overwrite=1

  [Regression Potential]

  The fix is an upstream patch from 5.17, commit
  0bd2fbee9d0b7f801a9c0264d90b1e0d8053f395 ('scsi: storvsc: Fix unsigned
  comparison to zero'). Regression potential is low.

  [Other Info]

  SF: #00346757

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