(gdb) thread apply all bt

Thread 2 (Thread 0x4086f950 (LWP 4415)):
#0  0x00007fbe58807b56 in fts_read () from /lib/libc.so.6
#1  0x000000004086c1f0 in ?? ()
#2  0x000000004086c100 in ?? ()
#3  0x00007fbe5433f495 in ?? () from /usr/lib/libldap_r-2.4.so.2
#4  0x000000004086c2c0 in ?? ()
#5  0x0000000007c73690 in ?? ()
#6  0x0000000000000028 in ?? ()
#7  0x0000000000000018 in ?? ()
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fbe595496e0 (LWP 4414)):
#0  0x00007fbe5912abd1 in sem_wait () from /lib/libpthread.so.0
#1  0x00000000004a8cb8 in PyThread_acquire_lock ()
#2  0x0000000000477fd4 in PyEval_RestoreThread ()
#3  0x00007fbe54ff216f in ?? () from /usr/lib/python2.4/lib-dynload/select.so
#4  0x000000000047d914 in PyEval_EvalFrame ()
#5  0x000000000047de47 in PyEval_EvalFrame ()
#6  0x000000000047e7c5 in PyEval_EvalCodeEx ()
#7  0x000000000047e8e2 in PyEval_EvalCode ()
#8  0x00000000004a48b0 in PyRun_FileExFlags ()
#9  0x00000000004a4aeb in PyRun_SimpleFileExFlags ()
#10 0x00000000004124a1 in Py_Main ()
#11 0x00007fbe5875f1a6 in __libc_start_main () from /lib/libc.so.6
#12 0x0000000000411949 in _start ()
#0  0x00007fbe5912abd1 in sem_wait () from /lib/libpthread.so.0