(gdb) bt full
#0  0x0018b7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
No symbol table info available.
#1  0x001cb7f5 in raise () from /lib/tls/libc.so.6
No symbol table info available.
#2  0x001cd199 in abort () from /lib/tls/libc.so.6
No symbol table info available.
#3  0x001ff4ea in __libc_message () from /lib/tls/libc.so.6
No symbol table info available.
#4  0x0020664c in _int_malloc () from /lib/tls/libc.so.6
No symbol table info available.
#5  0x00207e26 in calloc () from /lib/tls/libc.so.6
No symbol table info available.
#6  0x080bb8f2 in _ast_calloc (num=1, len=1004, file=0x8117ddf "cdr.c", lineno=436, func=0x81180a9 "ast_cdr_alloc")
    at include/asterisk/utils.h:313
        p = (void *) 0x8
        __PRETTY_FUNCTION__ = "_ast_calloc"
#7  0x0808fbce in ast_cdr_alloc () at cdr.c:436
        __PRETTY_FUNCTION__ = "ast_cdr_alloc"
#8  0x08076c4c in __ast_pbx_run (c=0xb7b099f8) at pbx.c:2210
        found = 0
        res = 0
        autoloopflag = 12
        error = 0
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#9  0x08077c42 in pbx_thread (data=0xb7b099f8) at pbx.c:2464
        c = (struct ast_channel *) 0xb7b099f8
#10 0x080bc506 in dummy_start (data=0xb7b05278) at utils.c:554
        _buffer = {__routine = 0x80a7e75 <ast_unregister_thread>, __arg = 0x2989bb0, __canceltype = 146794640, __prev = 0x0}
        ret = (void *) 0x2c866c
        a = {start_routine = 0x8077c2b <pbx_thread>, data = 0xb7b099f8,
  name = 0xb7b0a078 "pbx_thread", ' ' <repeats 11 times>, "started at [ 2488] pbx.c ast_pbx_start()"}
#11 0x00312371 in start_thread () from /lib/tls/libpthread.so.0
No symbol table info available.
#12 0x0026b9be in clone () from /lib/tls/libc.so.6
No symbol table info available.