(gdb) bt full
#0  0xb783e0cf in find_subchannel_by_instance_reference (d=0x820c5b8, instance=1, reference=8) at chan_skinny.c:1553
        l = (struct skinny_line *) 0x820c788
        sub = (struct skinny_subchannel *) 0xdeadbeef
        __PRETTY_FUNCTION__ = "find_subchannel_by_instance_reference"
#1  0xb78486d3 in handle_stimulus_message (req=0x82496b0, s=0x82cff78) at chan_skinny.c:4137
        d = (struct skinny_device *) 0x820c5b8
        l = (struct skinny_line *) 0x1
        sub = (struct skinny_subchannel *) 0x814ea4a
        c = (struct ast_channel *) 0xb7442238
        t = 3074695720
        event = 9
        instance = 1
        callreference = 0
        __PRETTY_FUNCTION__ = "handle_stimulus_message"
        __FUNCTION__ = "handle_stimulus_message"
#2  0xb784e52a in handle_message (req=0x82496b0, s=0x82cff78) at chan_skinny.c:5459
        res = 0
        __PRETTY_FUNCTION__ = "handle_message"
#3  0xb784fb4b in skinny_session (data=0x82cff78) at chan_skinny.c:5701
        res = 20
        req = (struct skinny_req *) 0x82496b0
        s = (struct skinnysession *) 0x82cff78
        __PRETTY_FUNCTION__ = "skinny_session"
#4  0x0814f6e8 in dummy_start (data=0x82d08c8) at utils.c:917
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {-1212469260, 0, 4001536, -1220271176, 1189433411, -414692035}, __mask_was_saved = 0}}, __pad = {0xb7442480, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x8072919 <ast_unregister_thread>
        __cancel_arg = (void *) 0xb7442b90
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0xb784fa76 <skinny_session>, data = 0x82cff78, name = 0x82d0960 "skinny_session       started at [ 5750] chan_skinny.c accept_thread()"}
        lock_info = (struct thr_lock_info *) 0x82d0a30
        mutex_attr = {__size = "\001\000\000", __align = 1}
        __PRETTY_FUNCTION__ = "dummy_start"
#5  0xb7ba4315 in start_thread () from /lib/i686/libpthread.so.0
No symbol table info available.
#6  0xb7c92dde in clone () from /lib/i686/libc.so.6
No symbol table info available.