[Bug 235549] [nullfs] panic: Don't call insmntque(foo, NULL)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235549

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

Author: kib
Date: Fri Feb  8 08:20:19 UTC 2019
New revision: 343899
URL: https://svnweb.freebsd.org/changeset/base/343899

Log:
  Un null_vptocnp(), cache vp->v_mount and use it for null_nodeget() call.

  The vp vnode is unlocked during the execution of the VOP method and
  can be reclaimed, zeroing vp->v_data.  Caching allows to use the
  correct mount point.

  Reported and tested by:       pho
  PR: 235549
  Sponsored by: The FreeBSD Foundation
  MFC after:    1 week

Changes:
  head/sys/fs/nullfs/null_vnops.c

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