Another bug that may be similar: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=671785
In that bug I remark that a problem with pthread_mutex_unlock can be observed on linux with valgrind --tool=helgrind. I haven't tried to determine whether it's a similar problem here, but it might be worth valgrinding it on Linux. (unfortunately I can't do this at the moment; if I get a chance I'll report the results here) Jeff
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