[Bug 215715] cond_test:cond_timedwait_race crashes with SIGSEGV periodically when calling binuptime

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215715

--- Comment #6 from Konstantin Belousov <kib at FreeBSD.org> ---
Created attachment 178503
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178503&action=edit
A test program illustrating bug with two threads executing gettimeofday()
concurrently

The program makes an easy reproduction case for the bug I fixed in the patch. 
The timecounter should be set to HPET, then the program run.  It forks children
which try to execute gettimeofday() concurrently, and at the end print stats of
normally exited and signalled children.

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