(gdb) bt full
#0  0xb790055e in get_devicestate (l=0x820dc88) at chan_skinny.c:3625
        sub = (struct skinny_subchannel *) 0x1
        res = 1
#1  0xb790a23a in skinny_devicestate (data=0xb7ada257) at chan_skinny.c:5822
        l = (struct skinny_line *) 0x820dc88
        tmp = 0xb7ada1e0 "324@PJ"
#2  0x080b001c in _ast_device_state (device=0x82e079c "Skinny/324@PJ", check_cache=0) at devicestate.c:331
        buf = 0xb7ada257 "324@PJ"
        number = 0xb7ada257 "324@PJ"
        chan_tech = (const struct ast_channel_tech *) 0xb79100e0
        res = 3081612176
        tech = 0xb7ada250 "Skinny"
        provider = 0x0
        __PRETTY_FUNCTION__ = "_ast_device_state"
#3  0x080b0584 in do_state_change (device=0x82e079c "Skinny/324@PJ") at devicestate.c:439
        state = AST_DEVICE_UNKNOWN
        __PRETTY_FUNCTION__ = "do_state_change"
#4  0x080b0f9c in do_devstate_changes (data=0x0) at devicestate.c:517
        next = (struct state_change *) 0x0
        current = (struct state_change *) 0x82e0798
        __PRETTY_FUNCTION__ = "do_devstate_changes"
#5  0x0814f6e8 in dummy_start (data=0x81effb0) at utils.c:917
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {-1211707404, 0, 4001536, -1213357128, 433034418, 1801619917}, __mask_was_saved = 0}}, __pad = {0xb7ada480, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x8072919 <ast_unregister_thread>
        __cancel_arg = (void *) 0xb7adab90
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0x80b0ec5 <do_devstate_changes>, data = 0x0, name = 0x81f2c58 "do_devstate_changes  started at [  529] devicestate.c ast_device_state_engine_init()"}
        lock_info = (struct thr_lock_info *) 0x81f6518
        mutex_attr = {__size = "\001\000\000", __align = 1}
        __PRETTY_FUNCTION__ = "dummy_start"
#6  0xb7c5e315 in start_thread () from /lib/i686/libpthread.so.0
No symbol table info available.
#7  0xb7d4cdde in clone () from /lib/i686/libc.so.6
No symbol table info available.