(gdb) bt
#0  0xb5d89379 in __lll_mutex_lock_wait () from /lib/tls/libc.so.6
#1  0xb5d1aa1b in _L_mutex_lock_3089 () from /lib/tls/libc.so.6
#2  0x095d5718 in ?? ()
#3  0xb5e57a38 in ?? ()
#4  0xb5f87ff4 in ?? () from /lib/tls/libdl.so.2
#5  0x00000001 in ?? ()
#6  0xb5c5293c in ?? ()
#7  0xbfbb76a8 in ?? ()
#8  0xb5f864b4 in free_key_mem () from /lib/tls/libdl.so.2
#9  0xb5f864b4 in free_key_mem () from /lib/tls/libdl.so.2
#10 0xb5fde0d8 in __nptl_deallocate_tsd () from /lib/tls/libpthread.so.0
#11 0xb5cc7e6a in __libc_start_main () from /lib/tls/libc.so.6
#12 0x0804c731 in _start () at ../sysdeps/i386/elf/start.S:119