lib/51373: lib/libpthread/t_mutex:mutex5 test case fails

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         51373
>Category:       lib
>Synopsis:       lib/libpthread/t_mutex:mutex5 test case fails
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 28 12:40:00 +0000 2016
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

The lib/libpthread/t_mutex:mutex5 test case is failing, probably
ever since it was added in this commit:

  revision 1.8
  date: 2016-07-03 17:24:59 +0300;  author: christos;  state: Exp;  lines: +249 -3;  commitid: k9tYpImPbpiGOScz;
  GSoC 2016 Charles Cui: Implement thread priority protection based on work
  by Andy Doran. Also document the get/set pshared thread calls as not
  implemented, and add a skeleton implementation that is disabled.
  XXX: document _sched_protect(2).

Here's log output from a recent failure:

  http://releng.netbsd.org/b5reports/i386/build/2016.07.28.03.09.47/test.html#lib_libpthread_t_mutex_mutex5

>How-To-Repeat:

Run the ATF tests.

>Fix: