[Bug 231516] [ZFS] Crash upon dectection of failed drive.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231516

--- Comment #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: allanjude
Date: Sat Sep 29 01:26:07 UTC 2018
New revision: 339009
URL: https://svnweb.freebsd.org/changeset/base/339009

Log:
  Avoid panic when adjusting priority of a read in the face of an IO error

  PR:           231516
  Reported by:  sbruno
  Approved by:  re (rgrimes)
  Obtained from:        ZFS-on-Linux
  X-MFC-with:   334844
  Sponsored by: Klara Systems

  MFV/ZoL:      Fix zio->io_priority failed (7 < 6) assert

  commit c26cf0966d131b722c32f8ccecfe5791a789d975
  Author: Tony Hutter <hutter2 at llnl.gov>
  Date:   Tue May 29 18:13:48 2018 -0700

    Fix zio->io_priority failed (7 < 6) assert

    This fixes an assert in vdev_queue_change_io_priority():

      VERIFY3(zio->io_priority < ZIO_PRIORITY_NUM_QUEUEABLE) failed (7 < 6)
      PANIC at vdev_queue.c:832:vdev_queue_change_io_priority()

    Reviewed-by: Tom Caputi <tcaputi at datto.com>
    Reviewed-by: George Melikov <mail at gmelikov.ru>
    Reviewed-by: Brian Behlendorf <behlendorf1 at llnl.gov>
    Signed-off-by: Tony Hutter <hutter2 at llnl.gov>

Changes:
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c

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