Stefan Krah <stefan-use...@bytereef.org> added the comment:

It is disputed on http://openradar.appspot.com/radar?id=334401 that
this is an OS bug. If I understand correctly, the test program is
not guaranteed to work if threads are involved. See also:

http://webcache.googleusercontent.com/search?q=cache:hJo0u_Lc8wkJ:www.opengroup.org/onlinepubs/000095399/functions/fork.html+http://www.opengroup.org/onlinepubs/009695399/functions/fork.html&hl=en&strip=1


"A process shall be created with a single thread. If a multi-threaded process 
calls fork(), the new process shall contain a replica of the calling thread and 
its entire address space, possibly including the states of mutexes and other 
resources. Consequently, to avoid errors, the child process may only execute 
async-signal-safe operations until such time as one of the exec functions is 
called. [THR] [Option Start]  Fork handlers may be established by means of the 
pthread_atfork() function in order to maintain application invariants across 
fork() calls."


This could explain why running the complete test suite fails but
running the individual test does not.

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