#0  0x00002af3f232a293 in pthread_mutex_lock () from /lib64/libpthread.so.0
(gdb) bt full                                                                                                                       
#0  0x00002af3f232a293 in pthread_mutex_lock () from /lib64/libpthread.so.0
No symbol table info available.
#1  0x00002aaaad421525 in ast_mutex_lock (pmutex=0x0) at /usr/src/asterisk/include/asterisk/lock.h:758
No locals.
#2  0x00002aaaad420a78 in retrans_pkt (data=0x2aaac00866e0) at chan_sip.c:1954
        pkt = (struct sip_pkt *) 0x2aaac00866e0
        prev = (struct sip_pkt *) 0x0
        cur = (struct sip_pkt *) 0x0
        reschedule = 1000
        xmitres = 0
        __PRETTY_FUNCTION__ = "retrans_pkt"
#3  0x00000000004b97a3 in ast_sched_runq (con=0x15193a70) at sched.c:363
        current = (struct sched *) 0x15b8a380
        tv = {tv_sec = 1249413596, tv_usec = 476935}
        numevents = 1
        res = 10000
#4  0x00002aaaad46b078 in do_monitor (data=0x0) at chan_sip.c:16780
        res = 1
        sip = (struct sip_pvt *) 0x0
        peer = (struct sip_peer *) 0x0
        t = 1249413596
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 917
        reloading = 0
        __PRETTY_FUNCTION__ = "do_monitor"
#5  0x00000000004ca872 in dummy_start (data=0x151a4b90) at utils.c:856
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {0, -8408936051318336904, 0, 0, 1105375232, 4096, 
        -8408936051318336712, -8408936050220606623}, __mask_was_saved = 0}}, __pad = {0x41e2a1c0, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x424438 <ast_unregister_thread>
        __cancel_arg = (void *) 0x41e2a940
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0x2aaaad46aa60 <do_monitor>, data = 0x0, 
  name = 0x151a4bb0 "do_monitor", ' ' <repeats 11 times>, "started at [16833] chan_sip.c restart_monitor()"}
#6  0x00002af3f2328367 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#7  0x00002af3f3f95f7d in clone () from /lib64/libc.so.6
No symbol table info available.