(gdb) bt full
#0 0x0020d402 in __kernel_vsyscall ()
No symbol table info available.
#1 0x0083bd10 in raise () from /lib/libc.so.6
No symbol table info available.
#2 0x0083d621 in abort () from /lib/libc.so.6
No symbol table info available.
#3 0x00873e5b in __libc_message () from /lib/libc.so.6
No symbol table info available.
#4 0x0087bc1e in _int_free () from /lib/libc.so.6
No symbol table info available.
0000005 0x0087f1e0 in free () from /lib/libc.so.6
No symbol table info available.
0000006 0x0086a866 in fclose@@GLIBC_2.1 () from /lib/libc.so.6
No symbol table info available.
0000007 0x080b14b7 in filestream_destructor ()
No symbol table info available.
0000008 0x0807704c in __ast_pthread_mutex_unlock ()
No symbol table info available.
0000009 0x080b3ffb in ast_filestream_frame_freed ()
No symbol table info available.
0000010 0x080b5587 in ast_frame_free ()
No symbol table info available.
0000011 0x00d3c3e7 in moh_files_generator (chan=0x8b48480, data=0x8cb74c8,
    len=160, samples=160) at res_musiconhold.c:294
        state = (struct moh_files_state *) 0x8cb74c8
        f = (struct ast_frame *) 0x8ba1410
        res = 0
        __PRETTY_FUNCTION__ = "moh_files_generator"
0000012 0x0808d337 in ast_read_generator_actions ()
No symbol table info available.
0000013 0x0808ebb1 in __ast_read ()
No symbol table info available.
0000014 0x0808ee59 in ast_read ()
No symbol table info available.
0000015 0x0807bb49 in autoservice_run ()
No symbol table info available.
0000016 0x08120c77 in dummy_start ()
No symbol table info available.
0000017 0x0098c45b in start_thread () from /lib/libpthread.so.0
No symbol table info available.
0000018 0x008e3e5e in clone () from /lib/libc.so.6
No symbol table info available.