(gdb) bt full
#0  0x006f0402 in __kernel_vsyscall ()
No symbol table info available.
#1  0x0043ec00 in raise () from /lib/libc.so.6
No symbol table info available.
#2  0x00440451 in abort () from /lib/libc.so.6
No symbol table info available.
#3  0x004741fb in __libc_message () from /lib/libc.so.6
No symbol table info available.
#4  0x0047bf5d in _int_free () from /lib/libc.so.6
No symbol table info available.
#5  0x0047f5b0 in free () from /lib/libc.so.6
No symbol table info available.
#6  0x080aac84 in __ast_module_user_remove (mod=0xb7d28b40, u=0xb772ebe9) at loader.c:204
No locals.
#7  0x007a12cc in local_hangup (ast=0xb7780898) at chan_local.c:499
        status = 0x0
        p = (struct local_pvt *) 0xb7708c70
        isoutbound = 1
        f = {frametype = AST_FRAME_CONTROL, subclass = 1, datalen = 0, samples = 0, mallocd = 0, mallocd_hdr_len = 0, offset = 0, src = 0x0,
  data = 0x0, delivery = {tv_sec = 0, tv_usec = 0}, frame_list = {next = 0x0}, has_timing_info = 0, ts = 0, len = 0, seqno = 0}
        ochan = (struct ast_channel *) 0x0
        glaredetect = 0
        res = 0
#8  0x0807f1db in ast_hangup (chan=0xb7780898) at channel.c:1764
        res = 0
        cdr = (struct ast_cdr *) 0xb7780c88
        __PRETTY_FUNCTION__ = "ast_hangup"
#9  0x080becab in __ast_pbx_run (c=0xb7780898) at pbx.c:2543
        found = 1
        res = 0
        autoloopflag = 0
        error = 1
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#10 0x080bee7b in pbx_thread (data=0xb7780898) at pbx.c:2603
        c = (struct ast_channel *) 0xb7780898
#11 0x080fa09c in dummy_start (data=0xb790d3a8) at utils.c:775
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {5865460, 0, 24230800, 24228808, 1570729324, 1424064096},
      __mask_was_saved = 0}}, __pad = {0x171b480, 0x0, 0x0, 0x0}}
        __cancel_routine = (void (*)(void *)) 0x8068b51 <ast_unregister_thread>
        __cancel_arg = (void *) 0x171bb90
        not_first_call = 0
        ret = (void *) 0x52156e
        a = {start_routine = 0x80bee64 <pbx_thread>, data = 0xb7780898,
  name = 0xb790d3b8 "pbx_thread", ' ' <repeats 11 times>, "started at [ 2627] pbx.c ast_pbx_start()"}
#12 0x005892db in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#13 0x004e312e in clone () from /lib/libc.so.6
No symbol table info available.