(gdb) bt full
#0  0x00002aaab86d698b in __ast_pthread_mutex_lock (filename=0x2aaab8733514 "chan_sip.c", lineno=1934, func=0x2aaab8733ab5 "retrans_pkt",
    mutex_name=0x2aaab8733ac1 "&pkt->owner->lock", t=0x0) at /root/_ast14/asterisk-1.4.26/include/asterisk/lock.h:354
        res = 0
        canlog = 0
        __PRETTY_FUNCTION__ = "__ast_pthread_mutex_lock"
#1  0x00002aaab86d5d25 in retrans_pkt (data=0x2aab640e4c60) at chan_sip.c:1934
        pkt = (struct sip_pkt *) 0x2aab640e4c60
        prev = (struct sip_pkt *) 0x533c99
        cur = (struct sip_pkt *) 0x0
        reschedule = 1000
        xmitres = 0
        __PRETTY_FUNCTION__ = "retrans_pkt"
#2  0x00000000004cfa87 in ast_sched_runq (con=0x12cdafa0) at sched.c:363
        current = (struct sched *) 0x2aab680c1050
        tv = {tv_sec = 1250599063, tv_usec = 126146}
        numevents = 0
        res = 1
        __PRETTY_FUNCTION__ = "ast_sched_runq"
#3  0x00002aaab8724af1 in do_monitor (data=0x0) at chan_sip.c:16727
        res = 0
        sip = (struct sip_pvt *) 0x2aab74029a30
        peer = (struct sip_peer *) 0x0
        t = 1250599063
        fastrestart = 1
        lastpeernum = 376
        curpeernum = 377
        reloading = 0
        __PRETTY_FUNCTION__ = "do_monitor"
#4  0x00000000004e3740 in dummy_start (data=0x12ce0220) at utils.c:856
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {0, -6999334483075797704, 0, 0, 1102749696, 4096, -6999334483075797912,
        -6999334481971951047}, __mask_was_saved = 0}}, __pad = {0x41ba91d0, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x42542d <ast_unregister_thread>
        __cancel_arg = (void *) 0x41ba9940
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0x2aaab87242fa <do_monitor>, data = 0x0,
  name = 0x12ce0240 "do_monitor", ' ' <repeats 11 times>, "started at [16780] chan_sip.c restart_monitor()"}
        lock_info = (struct thr_lock_info *) 0x12ce05f0
        mutex_attr = {__size = "\001\000\000", __align = 1} ---Type <return> to continue, or q <return> to quit---
#5  0x000000384b806367 in start_thread () from /lib64/libpthread.so.0 No symbol table info available.
#6  0x000000384b0d2f7d in clone () from /lib64/libc.so.6 No symbol table info available.
(gdb)