[Bug 218167] ctl(4): calling _callout_stop_safe with the following non-sleepable locks held

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218167

--- Comment #1 from commit-hook at freebsd.org ---
A commit references this bug:

Author: mav
Date: Mon Apr 24 12:52:42 UTC 2017
New revision: 317370
URL: https://svnweb.freebsd.org/changeset/base/317370

Log:
  Change ctl_free_lun() locking.

  This fixes potential callout_drain() sleep under non-sleepable lock.

  PR:           218167
  MFC after:    2 weeks

Changes:
  head/sys/cam/ctl/ctl.c

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