(gdb) bt full
#0  0xb7367f9d in pthread_mutex_lock () from /lib/libpthread.so.0
No symbol table info available.
#1  0xb75cde66 in pthread_mutex_lock () from /lib/libc.so.6
No symbol table info available.
#2  0xb68aa3d7 in dahdi_func_read (chan=0x85eded0, function=0xb4d6af20 "CHANNEL", data=0xb4d6af28 "dahdi_span", buf=0x85f3844 "", len=4096) at chan_dahdi.c:6851
        p = 0x0
        res = 0
        __PRETTY_FUNCTION__ = "dahdi_func_read"
#3  0xb5a7e3fe in func_channel_read (chan=0x85eded0, function=0xb4d6af20 "CHANNEL", data=0xb4d6af28 "dahdi_span", buf=0x85f3844 "", len=4096) at func_channel.c:392
        ret = 0
        __PRETTY_FUNCTION__ = "func_channel_read"
#4  0x08151690 in ast_func_read2 (chan=0x85eded0, function=0x85e5abd "CHANNEL(dahdi_span)", str=0xb4d6b084, maxlen=0) at pbx.c:3585
        maxsize = <value optimized out>
        copy = 0xb4d6af20 "CHANNEL"
        args = 0xb4d6af28 "dahdi_span"
        acfptr = 0xb5a80480
        res = <value optimized out>
        u = <value optimized out>
#5  0x0813d357 in append_channel_vars (category=2, event=0x81d6aba "Hangup", chancount=1, chans=0xb4d6b15c, file=0x81d64e9 "channel.c", line=2853, func=0x81d82c6 "ast_hangup",
    fmt=0x81d57b0 "Channel: %s\r\nUniqueid: %s\r\nCallerIDNum: %s\r\nCallerIDName: %s\r\nConnectedLineNum: %s\r\nConnectedLineName: %s\r\nCause: %d\r\nCause-txt: %s\r\n")
    at manager.c:4883
        res = 0x85f3838
        ret = <value optimized out>
        val = 0x81ca811 ""
        var = 0x85e5ab8
#6  __ast_manager_event_multichan (category=2, event=0x81d6aba "Hangup", chancount=1, chans=0xb4d6b15c, file=0x81d64e9 "channel.c", line=2853, func=0x81d82c6 "ast_hangup",
    fmt=0x81d57b0 "Channel: %s\r\nUniqueid: %s\r\nCallerIDNum: %s\r\nCallerIDName: %s\r\nConnectedLineNum: %s\r\nConnectedLineName: %s\r\nCause: %d\r\nCause-txt: %s\r\n")
    at manager.c:4942
        session = <value optimized out>
        hook = <value optimized out>
        auth = 0xb4d6afc0
        ap = 0xb4d6b0d0 "ð\220^\bÒ\220^\b\030i^\b\200þ\034\b\200þ\034\b\200þ\034\b"
        buf = 0x85f3328
        i = <value optimized out>
        __PRETTY_FUNCTION__ = "__ast_manager_event_multichan"
#7  0x080c334d in ast_hangup (chan=0x85eded0) at channel.c:2836
        _chans = {0x85eded0}
        extra_str = "0,,\000\000\000\000\000ô\017d·ï7\000\000\001\000\000\000ô\017d·ô\017d·\200#d·\000\000\000\000x±Ö´PpU·x±Ö´x\225\v\b Þ^\b\210\n\000\000æ\202\035\b"
        __PRETTY_FUNCTION__ = "ast_hangup"
#8  0x0815ff0e in __ast_pbx_run (c=0x85eded0, args=0x0) at pbx.c:5085
        found = 1
        res = <value optimized out>
        autoloopflag = 0
        error = <value optimized out>
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#9  0x08160c40 in pbx_thread (data=0x85eded0) at pbx.c:5177
        c = 0x85eded0
#10 0x0819ff3b in dummy_start (data=0x85e9378) at utils.c:1004
        __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {140442192, 0, 4001536, -1260997736, 58313449, -1646197872}, __mask_was_saved = 0}}, __pad = {0xb4d6b454, 0x0,
            0x0, 0x0}}
        __not_first_call = <value optimized out>
        ret = <value optimized out>
#11 0xb7365c04 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#12 0xb75be02e in clone () from /lib/libc.so.6
No symbol table info available.