[Bug 225795] panic: found unreferenced mountpoint when accessing and unmounting snapshots in parallel

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225795

--- Comment #4 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avg
Date: Mon Feb 19 08:55:23 UTC 2018
New revision: 329556
URL: https://svnweb.freebsd.org/changeset/base/329556

Log:
  relax an assert in zfsctl_snapdir_lookup to match r323578

  Since r323578 we may remove the last reference to a covered vnode with
  vrele() instead of vput().  So, v_usecount may be decremented before
  the vnode is locked and zfsctl_snapdir_lookup may "catch" the vnode
  with v_usecount of zero and v_holdcnt of one.

  PR:           225795
  Reported by:  asomers
  MFC after:    1 week

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

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