kernel-packages team mailing list archive

[AceLan Kao <1498778@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: AceLan Kao (acelankao)
         Status: In Progress

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => AceLan Kao (acelankao)

** Changed in: linux (Ubuntu)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1498778

Title:
  cpu hot-remove fails with nvme device

Status in linux package in Ubuntu:
  In Progress

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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