(gdb) 
(gdb) bt full
#0  0xb7e31f89 in free () from /lib/libc.so.6
No symbol table info available.
#1  0xb5dc13fe in __sip_destroy (p=0x1528, lockowner=1) at chan_sip.c:2097
        cur = (struct sip_pvt *) 0x0
        prev = (struct sip_pvt *) 0x0
        cp = (struct sip_pkt *) 0xb5de98b3
#2  0xb5db6539 in sip_destroy (p=0x1520) at chan_sip.c:2270
No locals.
#3  0xb5dbfc2d in __sip_autodestruct (data=0x81b0af8) at chan_sip.c:1332
No locals.
#4  0x08056858 in ast_sched_runq (con=0x818e3f0) at sched.c:374
        tv = {tv_sec = 5408, tv_usec = 0}
        x = 0
        res = 135854592
#5  0xb5dcb65a in do_monitor (data=0x0) at chan_sip.c:11364
        res = 135848944
        sip = (struct sip_pvt *) 0x818e3f0
        peer = (struct sip_peer *) 0x818e3f0
        t = 1137869448
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 6
        reloading = 135848944
#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)