Public bug reported:
Description:
kernel: CPU hotplug unsupported by CPUMF
Symptom:
The kernel crashes with a panic when CPU hotplug add is triggered during
execution of command 'perf stat -- <command>' on LPAR. z/VM is not affected.
Problem:
CPU hotplug add does not allocate memory and does not initialise per-CPU
variables required by the PMU device driver.
Reproduction:
Run the following commands
# echo 0 > /sys/devices/system/cpu/cpu1/online
# perf stat -e cycles -i -- stress-ng -t10s --matrix X
# sleep 1
# echo 1 > /sys/devices/system/cpu/cpu1/online
Solution:
Install CPU hotplug handler function to support CPU hotplug add and delete
operations.
Upstream-ID:
ddd52d6c635a2dc628a238c637d928425b0e3f53
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-222376 severity-high
targetmilestone-inin---
** Tags added: architecture-s39064 bugnameltc-222376 severity-high
targetmilestone-inin---
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/2165732
Title:
[UBUNTU 24.04] kernel: CPU hotplug unsupported by CPUMF
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