[Bug 201953] Auditdistd does not recover from TLS errors and just stops

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201953

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: pjd
Date: Thu Oct  4 05:54:58 UTC 2018
New revision: 339177
URL: https://svnweb.freebsd.org/changeset/base/339177

Log:
  When the adist_free list is empty and we lose connection to the receiver we
  move all elements from the adist_send and adist_recv lists back onto the
  adist_free list, but we don't wake consumers waitings for the adist_free list
  to become non-empty. This can lead to the sender process stopping audit trail
  files distribution and waiting forever.

  Fix the problem by adding the missing wakeup.

  While here slow down spinning on CPU in case of a short race in
  sender_disconnect() and add an explaination when it can occur.

  PR:           201953
  Reported by:  peter
  Approved by:  re (kib)

Changes:
  head/contrib/openbsm/bin/auditdistd/auditdistd.h
  head/contrib/openbsm/bin/auditdistd/sender.c

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