(gdb) bt full
#0  0xb7e31f89 in free () from /lib/libc.so.6
No symbol table info available.
#1  0xb7b373fe in __sip_destroy (p=0x3f78, lockowner=1) at chan_sip.c:2097
        cur = (struct sip_pvt *) 0x0
        prev = (struct sip_pvt *) 0x0
        cp = (struct sip_pkt *) 0xb7b5f8b3
#2  0xb7b2c539 in sip_destroy (p=0x3f70) at chan_sip.c:2270
No locals.
#3  0xb7b35c2d in __sip_autodestruct (data=0x8197b58) at chan_sip.c:1332
No locals.
#4  0x08056858 in ast_sched_runq (con=0x81512f8) at sched.c:374
        tv = {tv_sec = 16240, tv_usec = 0}
        x = 2
        res = 135620888
#5  0xb7b4165a in do_monitor (data=0x0) at chan_sip.c:11364
        res = 135598840
        sip = (struct sip_pvt *) 0x81512f8
        peer = (struct sip_peer *) 0x81512f8
        t = 1137883379
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 8
        reloading = 135598840
#6  0xb7f9673e in pthread_start_thread () from /lib/libpthread.so.0
No symbol table info available.
#7  0xb7e8a08a in clone () from /lib/libc.so.6
No symbol table info available.
(gdb)