Public bug reported:
[Impact]
If you attempt to remove and insert the ipmi_ssif module a number of times, it
would result in a kernel panic. This is due to mod_timer from arming a timer
that was already removed by del_timer during module unload.
[Fix]
In linux-next:
0711e8c1b457 ipmi: Fix timer race with module unload
[Test]
-- Test Case --
for i in {1..500}; do sudo modprobe -r ipmi_ssif; sleep 2s ; sudo modprobe
ipmi_ssif || exit; done
----------------
After the patch was applied, no kernel panics were obsereved. Tested on Cavium
ThunderX2.
[Regression Risk]
The patch was applied to bionic and tested tested on a Cavium ThunderX2 and no
regressions were found. Risk of regression none.
** Affects: linux (Ubuntu)
Importance: Critical
Assignee: Canonical Kernel Team (canonical-kernel-team)
Status: Incomplete
** Tags: bionic cavium
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https://bugs.launchpad.net/bugs/1799281
Title:
[Bionic][Cosmic] ipmi: Fix timer race with module unload
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