[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 #19 from commit-hook at freebsd.org ---
A commit references this bug:

Author: imp
Date: Fri Mar 23 16:23:15 UTC 2018
New revision: 331435
URL: https://svnweb.freebsd.org/changeset/base/331435

Log:
  Flag when we have a pending TUR. Don't schedule another one when we
  have one pending. Otherwise, we can race and send two, which is
  wasteful in close proximity. It can also cause the acaquire/release
  count for TUR to be > 1, which is undexpected.

  PR: 226510
  Differential Review: https://reviews.freebsd.org/D14792

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

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