(gdb) bt full
#0  0x00746fc0 in rawmemchr () from /lib/libc.so.6
No symbol table info available.
#1  0x0073c296 in _IO_str_init_static_internal () from /lib/libc.so.6
No symbol table info available.
#2  0x007304c3 in vsscanf () from /lib/libc.so.6
No symbol table info available.
#3  0x0072b63e in sscanf () from /lib/libc.so.6
No symbol table info available.
#4  0x009f2d3d in background_detect_exec (chan=0x9348bd0, data=0xb76e1ec8) at app_talkdetect.c:90
        res = 0
        tmp = 0xb76dfc70 "tt-monkeys"
        fr = (struct ast_frame *) 0xb76dfd28
        notsilent = 0
        start = {tv_sec = 0, tv_usec = 0}
        sil = 1000
        min = 1500
        max = -1
        x = 1500
        origrformat = 0
        dsp = (struct ast_dsp *) 0x0
        args = {argc = 3, argv = 0xb76dfcf4, filename = 0xb76dfc70 "tt-monkeys", silence = 0xb76dfc7b "1000", min = 0xb76dfc80 "1500", max = 0x0}
        __PRETTY_FUNCTION__ = "background_detect_exec"
#5  0x080dc9c6 in pbx_exec (c=0x9348bd0, app=0x92c3ae0, data=0xb76e1ec8) at pbx.c:728
        res = 169
        u = (struct ast_module_user *) 0x9349c58
        saved_c_appl = 0x0
        saved_c_data = 0x0
#6  0x080e1ed7 in pbx_extension_helper (c=0x9348bd0, con=0x0, context=0x9348d54 "default", exten=0x9348da4 "3000", priority=2, label=0x0, 
    callerid=0x9324e48 "1223", action=E_SPAWN, found=0xb76e430c, combined_find_spawn=1) at pbx.c:2699
        e = (struct ast_exten *) 0x929d5e0
        app = (struct ast_app *) 0x92c3ae0
        res = -1217508464
        q = {incstack = {0x0 <repeats 128 times>}, stacklen = 0, status = 5, swo = 0x0, data = 0x0, foundcontext = 0x9348d54 "default"}
        passdata = "tt-monkeys,1000,1500", '\0' <repeats 8171 times>
        matching_action = 0
        __PRETTY_FUNCTION__ = "pbx_extension_helper"
#7  0x080e3276 in ast_spawn_extension (c=0x9348bd0, context=0x9348d54 "default", exten=0x9348da4 "3000", priority=2, callerid=0x9324e48 "1223", 
    found=0xb76e430c, combined_find_spawn=1) at pbx.c:3190
No locals.
---Type <return> to continue, or q <return> to quit---
#8  0x080e3988 in __ast_pbx_run (c=0x9348bd0) at pbx.c:3289
        dst_exten = '\0' <repeats 160 times>, "��s", '\0' <repeats 61 times>, "\020\000\000\000(Q\201", '\0' <repeats 24 times>
        pos = 0
        digit = 0
        found = 1
        res = 0
        autoloopflag = 0
        error = 0
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#9  0x080e4b16 in pbx_thread (data=0x9348bd0) at pbx.c:3551
        c = (struct ast_channel *) 0x9348bd0
#10 0x0812add3 in dummy_start (data=0x93495d0) at utils.c:870
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {8769524, 0, -1217508464, -1217510456, 982362634, -2047785783}, __mask_was_saved = 0}}, 
  __pad = {0xb76e4480, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x806de87 <ast_unregister_thread>
        __cancel_arg = (void *) 0xb76e4b90
        not_first_call = 0
        ret = (void *) 0x0
        a = {start_routine = 0x80e4aff <pbx_thread>, data = 0x9348bd0, 
  name = 0x93495e0 "pbx_thread", ' ' <repeats 11 times>, "started at [ 3572] pbx.c ast_pbx_start()"}
#11 0x0084e45b in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#12 0x007a624e in clone () from /lib/libc.so.6
No symbol table info available.