(gdb) bt full
#0  0xb77a6f34 in _ao2_unlock@plt () from /usr/lib/asterisk/modules/res_timing_pthread.so
No symbol table info available.
#1  0xb77a7d66 in pthread_timer_ack (handle=1090, quantity=1) at res_timing_pthread.c:200
        timer = <value optimized out>
        __PRETTY_FUNCTION__ = "pthread_timer_ack"
#2  0x080b4f4d in __ast_read (chan=0x8b69b10, dropaudio=0) at channel.c:2643
        to = "\003\000%\b(í³²µ\031É·\000\000\000\000è,%\b8í³²L^\035\b\000\000\000\000\027\000É·Hí³²L^\035\b\000\000\000\000\027\000É·(í³²ô¿Ü·\000\000\000\000\000\000\000\0008í³\000Àì³²è\003\000\000`ì³²hí³\001%P\016\000·æ/K(\t\000\000\000\000\000\000\000\000\000\000Ôí³²Ôí³²\004", '\0' <repeats 11 times>, "\001\000\000\000\001\000\000\0002D\033\b誶\b\000\000\000\000®\000\000\000\222\217\"\b·æ/K«¸\016\000|¥¶\bè\003\000\000\020\233¶\b\000\000\000\000Èí³²\rm\v\bÐí³²\001\000\000\000\000\000\000"
        f = <value optimized out>
        blah = -1296831020
        count = <value optimized out>
        __PRETTY_FUNCTION__ = "__ast_read"
#3  0x081130df in waitstream_core (c=0x8b69b10, breakon=0xb78dc2cb "", forward=0x81fbf1f "", 
    reverse=0x81fbf1f "", skip_ms=0, audiofd=-1, cmdfd=-1, context=0x0) at file.c:1232
        outfd = -1210617658
        rchan = <value optimized out>
        orig_chan_name = 0x0
        __PRETTY_FUNCTION__ = "waitstream_core"
#4  0x081135d8 in ast_waitstream (c=0x8b69b10, breakon=0xb78dc2cb "") at file.c:1317
No locals.
#5  0xb78db554 in playback_exec (chan=0x8b69b10, data=0xb2b40fa8) at app_playback.c:445
        __r1 = 0 '\0'
        __r2 = <value optimized out>
        back = 0x0
        front = <value optimized out>
        res = <value optimized out>
        mres = 0
        option_skip = 0
        option_say = 0
        option_noanswer = <value optimized out>
        args = {argc = 1, argv = 0xb2b3eee0, filenames = 0xb2b3ee80 "demo-congrats", options = 0x0}
        __PRETTY_FUNCTION__ = "playback_exec"
#6  0x081634e0 in pbx_exec (c=0x8b69b10, app=0x8330e88, data=0xb2b40fa8) at pbx.c:960
        res = <value optimized out>
        u = (struct ast_module_user *) 0x8bd78d0
        saved_c_appl = 0x0
        saved_c_data = 0x0
        __PRETTY_FUNCTION__ = "pbx_exec"
#7  0x08179e5a in pbx_extension_helper (c=0x8b69b10, con=0x0, context=0x8b6a390 "test11", 
    exten=0x8b6a3e0 "12", priority=2, label=0x0, callerid=0x8acddc8 "sipp", action=E_SPAWN, 
    found=0xb2b433e8, combined_find_spawn=1) at pbx.c:3219
        e = (struct ast_exten *) 0x82b8328
        app = (struct ast_app *) 0x8330e88
        res = <value optimized out>
        q = {incstack = {0x0 <repeats 128 times>}, stacklen = 0, status = 5, swo = 0x0, data = 0x0, 
  foundcontext = 0x8b6a390 "test11"}
        passdata = "demo-congrats", '\0' <repeats 8151 times>, "üÿÿÿù\203¿·ù\203¿·Ä/´²\203 Ú·2BÚ·´/´\v"
        matching_action = 0
        __PRETTY_FUNCTION__ = "pbx_extension_helper"
#8  0x0817cadf in __ast_pbx_run (c=0x8b69b10, args=0x0) at pbx.c:3675
        waittime = <value optimized out>
---Type <return> to continue, or q <return> to quit---
        dst_exten = "_\000\000\000\000\000\000\000\020\004\000\000\000\000\000\000\000\020\002", '\0' <repeats 17 times>, "ô¿Ü·ÀÔÜ·A\004\000\000H3´²¾fзÀÔÜ·\024Jз\000\000\000\000:\032É·A\004\000\000À˶\b(\t\000\000È˶\bè,%\b\000\000\000\000ðØÜ·øÔÜ·\001\000\000\000è,%\b\2303´²øÔÜ·I\000\000\000äÔÜ·¨3´²L^\035\b\000\000\000\000\027\000É·\2103´²ô¿Ü·\2102#\b\2142#\b\2303´²Æp×·ÔÔ¶\bøÔÜ·\0003¶\b\t\000\000\000ÔÔ¶\b(\t\000\000È3´²ô¿Ü·,3#\bÔÔ¶"...
        pos = 146158544
        digit = <value optimized out>
        invalid = <value optimized out>
        found = 1
        res = 0
        error = 0
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#9  0x0817ea60 in pbx_thread (data=0x8b69b10) at pbx.c:4051
No locals.
#10 0x081d5feb in dummy_start (data=0x8b000f0) at utils.c:968
        _buffer = {__routine = 0x8082610 <ast_unregister_thread>, __arg = 0xb2b43bb0, __canceltype = 0, 
  __prev = 0x0}
        ret = <value optimized out>
        mutex_attr = {__mutexkind = 1}
#11 0xb7c8e240 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#12 0xb7d6a49e in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.