[Bug 192918] [patch] A thread will spin if a signal interrupts umtxq_sleep_pi.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192918

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A commit references this bug:

Author: kib
Date: Fri Aug 22 18:42:15 UTC 2014
New revision: 270345
URL: http://svnweb.freebsd.org/changeset/base/270345

Log:
  In do_lock_pi(), do not override error from umtxq_sleep_pi() when
  doing suspend check.  This restores the pre-r251684 behaviour, to
  retry once after the signal is detected.

  PR:    kern/192918
  Submitted by:    Elliott Rabe, Dell Inc., Eric van Gyzen <eric at vangyzen.net>
  Obtained from:    Dell Inc.
  MFC after:    1 week

Changes:
  head/sys/kern/kern_umtx.c

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