Hi,

I will see what I can do to enable the core dumps using 
PTHREAD_DIAGASSERT (as Christian
suggested).

As for the undefined behavior that Klaus described, I would much rather 
see an error message
and the program continue rather than an error message and the program 
going away. Having said
that, I'll admit that there may be a good reason why the program goes 
away (I'm just not too familar
with the libpthread internals to understand what is going on there).

Brian