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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