gdb> bt full
0 0x00a6edf7 in pthread_mutex_trylock () from /lib/tls/libpthread.so.0
No symbol table info available.
1 0x08060928 in ast_queue_hangup (chan=0x6d080018) at lock.h:589
        f = {frametype = 4, subclass = 1, datalen = 0, samples = 0, mallocd = 0, offset = 0, src = 0x0, data = 0x0,
  delivery = {tv_sec = 0, tv_usec = 0}, prev = 0x0, next = 0x0}
2 0xb7c70932 in __sip_autodestruct (data=0xb780af60) at chan_sip.c:1318
        __PRETTY_FUNCTION__ = "__sip_autodestruct"
3 0x080565b8 in ast_sched_runq (con=0x812e9d0) at sched.c:373
        tv = warning: Unhandled dwarf expresion opcode DW_OP_piece
{tv_sec = 0, tv_usec = 135353244}
        x = 0
        res = 893517
4 0xb7c9c051 in do_monitor (data=0x0) at chan_sip.c:11251
        res = 0
        sip = (struct sip_pvt *) 0x812e9d0
        peer = (struct sip_peer *) 0x0
        t = 1132559064
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 20
        reloading = 135457232
        __PRETTY_FUNCTION__ = "do_monitor"
0000005 0x00a6d1d5 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
0000006 0x007ca2da in clone () from /lib/tls/libc.so.6
No symbol table info available.