To reproduce bug using libthread_xu:

run firefox 3 or firefox 2.0.0.15
take from menu File/Open File

and it coredumps.

  firefox &
[1] 991
 >
GThread-ERROR **: file gthread-posix.c: line 348 
(g_thread_create_posix_impl): error 'Operation not supported' during 
'pthread_attr_setschedparam (&attr, &sched)'
aborting...

gdb backtrace from: http://rafb.net/p/iJLxwS34.html

It doesn't happen with libc_r.so

Bye,                 \fer