(gdb) bt full
#0  0x00766479 in free () from /lib/tls/libc.so.6
No symbol table info available.
#1  0xb7c63c16 in __sip_destroy (p=0x353231, lockowner=1) at chan_sip.c:2102
        newcount = 0
        cur = (struct sip_pvt *) 0x0
        prev = (struct sip_pvt *) 0x0
        cp = (struct sip_pkt *) 0x0
        __PRETTY_FUNCTION__ = "__sip_destroy"
#2  0xb7c70962 in __sip_autodestruct (data=0x81cbb88) at chan_sip.c:2265
        __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 = 8558564, tv_usec = 0}
        x = 0
        res = 877590
#4  0xb7c9c051 in do_monitor (data=0x0) at chan_sip.c:11251
        res = 8558564
        sip = (struct sip_pvt *) 0x812e9d0
        peer = (struct sip_peer *) 0x0
        t = 1132642861
        fastrestart = 0
        lastpeernum = -1
        curpeernum = 20
        reloading = 135457232
        __PRETTY_FUNCTION__ = "do_monitor"
#5  0x00a6d1d5 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#6  0x007ca2da in clone () from /lib/tls/libc.so.6
No symbol table info available.