[Bug 197365] pthread_barrier_destroy() return EBUSY on idle barrier

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197365

            Bug ID: 197365
           Summary: pthread_barrier_destroy() return EBUSY on idle barrier
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: threads
          Assignee: freebsd-threads at FreeBSD.org
          Reporter: fguiliani at verisign.com

Created attachment 152607
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=152607&action=edit
reproduce test case

pthread_barrier_destroy() can return EBUSY even when the barrier is not in use.
The problem was introduced somewhere between FreeBSD 8 and 10.0-RELEASE.

I have attached a simple test case to reproduce the issue. The problem seems
related
to the use of uninitialized memory.

pthread_barrier_destroy() is testing bar->b_destroying in thr_barrier.c:
https://github.com/verisign/freebsd/blob/f4c11c6b678195515bbab8bb2825fa5222ed3a58/lib/libthr/thread/thr_barrier.c#L53

while pthread_barrier_init() did not initialized bar->b_destroying:
https://github.com/verisign/freebsd/blob/f4c11c6b678195515bbab8bb2825fa5222ed3a58/lib/libthr/thread/thr_barrier.c#L95

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