6.1 libpthread: pthread_create and _pq_insert_tail: Already in priority queue

[Volker Stolz]

A rather largish application (the most recent version of GHC, see lang/ghc)
fails in its runtime system with:

_pq_insert_tail: Already in priority queue

Basically some threads and mutexes are involved, then the application forks, some more threads
are created and then I get this error on a pthread_create().

If I use libmap.conf to map libpthread to either libthr or libc_r, the error
doesn't occur. I'm a bit baffled by this...any pointers are welcome!

This is mentioned on some MySQL-lists as well, but never with an explanation :|
Maybe the runtime is violation some assumptions on what it should be able to do
with threads, but I couldn't find anything "interesting".

Cheers,
  Volker
-- 
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