[Bug 209580] ZFS with INVARIANTS enabled deadlock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209580

--- Comment #8 from commit-hook at freebsd.org ---
A commit references this bug:

Author: julian
Date: Mon Oct 10 04:57:33 UTC 2016
New revision: 306935
URL: https://svnweb.freebsd.org/changeset/base/306935

Log:
  While the thread is sleeping in taskqueue_drain_all() it is
  posible that the queue entry it is looking at is removed
  from the queue, but we make no effort to account
  for this. when we wake up we need to check it's still there.

  PR: 209580
  Sponsored by: Panzura inc
  Differential Revision:        D8160

Changes:
  stable/10/sys/kern/subr_taskqueue.c

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