[Bug 230962] Kernel panic when writing extended attributes with soft updates enabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230962

--- Comment #11 from commit-hook at freebsd.org ---
A commit references this bug:

Author: mckusick
Date: Mon Jan 28 21:36:46 UTC 2019
New revision: 343536
URL: https://svnweb.freebsd.org/changeset/base/343536

Log:
  This bug was introduced with the change to use softdep_bp_to_mp() in
  January 2018 changes -r327723 and -r327821. The softdep_bp_to_mp()
  function failed to include VFIFO as one of the valid cases.

  Although fifo's do not allocate blocks in the filesystem, they will
  allocate blocks if they use extended attributes (such as ACLs). Thus,
  softdep_bp_to_mp() needs to return a non-NULL mount pointer when
  presented with a fifo vnode so that the soft updates write complete
  will properly process the soft updates structures associated with the
  extended attribute blocks. It was the failure to process these soft
  updates structures, thus leaving them hanging off the buffer, which
  lead to the "panic: softdep_deallocate_dependencies: dangling deps"
  when trying to clean up the buffer after it was written.

  PR:           230962
  Reported by:  2t8mr7kx9f at protonmail.com
  Reviewed by:  kib
  Tested by:    Peter Holm
  MFC after:    1 week
  Sponsored by: Netflix

Changes:
  head/sys/ufs/ffs/ffs_softdep.c

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