[Bug 220691] ZFS instantly panics on boot from degraded volume or after a drive failure

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220691

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

Author: avg
Date: Tue Jul 18 07:41:39 UTC 2017
New revision: 321111
URL: https://svnweb.freebsd.org/changeset/base/321111

Log:
  fix a regression in r320452, ZFS ABD import

  I overlooked the fact that vdev_op_io_done hook is called even if the
  actual I/O is skipped, for example, in the case of a missing vdev.
  Arguably, this could be considered an issue in the zio pipeline engine,
  but for now I am adding defensive code to check for io_bp being NULL
  along with assertions that that happens only when it can be really
  expected.

  PR:           220691
  Reported by:  peter, cy
  Tested by:    cy
  MFC after:    1 week
  X-MFC with:   r320156, r320452

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

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