gdb) thread apply all bt

Thread 1 (Thread -1232922944 (LWP 4248)):
#0  0xb7fdd410 in ?? ()
#1  0xbfb47b78 in ?? ()
#2  0x00000002 in ?? ()
#3  0x4e56556e in __lll_mutex_lock_wait () from /lib/tls/i686/cmov/libpthread.so.0