lib/51387: lib/libpthread/t_mutex:mutex6 test case sometimes fails

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

>Number:         51387
>Category:       lib
>Synopsis:       lib/libpthread/t_mutex:mutex6 test case sometimes fails
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Aug 04 19:15:00 +0000 2016
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:

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

The lib/libpthread/t_mutex:mutex6 test case sometimes fails.
Log output from the most recent failure on the TNF testbed is at:

  http://releng.netbsd.org/b5reports/i386/build/2016.08.03.03.35.24/test.html#lib_libpthread_t_mutex_mutex6

>How-To-Repeat:

Run the ATF tests repeatedly.

>Fix: