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[Bug 1498778] Re: cpu hot-remove fails with nvme device


This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
vivid' to 'verification-done-vivid'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

** Tags added: verification-needed-vivid

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  cpu hot-remove fails with nvme device

Status in HWE Next:
  In Progress
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  Using cpu hotplug to disable (offline) a cpu:
  echo 0 > /sys/devices/system/cpu/cpu10/online
  does not return.

  Machine is usable, and cpu10 is marked as offline, but any test
  scripts hangs because the "echo 0" never returned.

  Doing bisect pointed to this commit id: a4aea5623d "NVMe: Convert to blk-mq"
  Indeed, the test machine in question has an NVMe card.
  Doing "rmmod nvme" and then disabling cpus works.

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