[Bug 226510] panic: Re-refing for reason 5, cnt = 1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: imp
Date: Mon Mar 12 15:17:16 UTC 2018
New revision: 330796
URL: https://svnweb.freebsd.org/changeset/base/330796

Log:
  Tighten up periph lock to avoid some races

  Make sure the periph lock is held around rmw access to softc data,
  espeically flags, including work flags in iosched.
  Add asserts for the periph lock where it should be held.

  PR: 226510
  Sponsored by: Netflix
  Differential Review: https://reviews.freebsd.org/D14456

Changes:
  head/sys/cam/scsi/scsi_da.c

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