-- cosmic testing --
ubuntu@starbuck:~$ uname -a 
Linux starbuck 4.18.0-10-generic #11~lp1799281+cosmic.1 SMP Mon Oct 22 21:45:47 
UTC 2018 aarch64 aarch64 aarch64 GNU/Linux
ubuntu@starbuck:~$ for i in {1..500}; do sudo modprobe -r ipmi_ssif; sleep 2s ; 
sudo modprobe ipmi_ssif || exit; done

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https://bugs.launchpad.net/bugs/1799281

Title:
  [Bionic][Cosmic]  ipmi: Fix timer race with module unload

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [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.

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