PROBLEM: (91631) (PATCH ID: OSF520-436)
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Shared libraries that call atexit() or pthread_atfork() to
register atexit or prefork handlers do not unregister the handlers
if the libraries are unmapped by a call to dlclose.  This condition
causes a segfault when an attempt is made to invoke the handlers during
an exit() or fork() operation.
The patch properly unregisters the handlers that were registered by
atexit() or pthread_atfork(), when the shared libraries in which they
reside are unmapped by a dlclose() call.