** Changed in: hwe-next
Status: New => In Progress
** Changed in: hwe-next
Assignee: (unassigned) => AceLan Kao (acelankao)
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https://bugs.launchpad.net/bugs/1498778
Title:
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:
New
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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