(gdb) bt full
#0  0xb7785430 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7515b61 in __libc_writev (fd=-1218895884, vector=0xbfd61438, count=1)
    at ../sysdeps/unix/sysv/linux/writev.c:51
        resultvar = <value optimized out>
        result = <value optimized out>
#2  0x0813a77e in _XSERVTransSocketWritev (ciptr=0x952bbf8, buf=0xbfd61438, 
    size=1) at /usr/include/X11/Xtrans/Xtranssock.c:2191
No locals.
#3  0x08139e9f in _XSERVTransWritev (ciptr=0x952bbf8, buf=0xbfd61438, size=1)
    at /usr/include/X11/Xtrans/Xtrans.c:912
No locals.
#4  0x08135b46 in FlushClient (who=0x9727468, oc=0x9604c10, __extraBuf=0x0, 
    extraCount=0) at ../../os/io.c:899
        before = <value optimized out>
        remain = <value optimized out>
        i = <value optimized out>
        len = <value optimized out>
        oco = 0x93cf420
        connection = 45
        trans_conn = 0x952bbf8
        iov = {{iov_base = 0x9306648, iov_len = 32}, {iov_base = 0x2d, 
            iov_len = 153804960}, {iov_base = 0x1000, iov_len = 135654459}}
        padBuffer = "\000\000"
        written = 0
        padsize = 0
        notWritten = 32
        todo = 32
#5  0x08134574 in CloseDownConnection (client=0x9727468)
    at ../../os/connection.c:1047
        oc = 0x9604c10
#6  0x08087a4d in CloseDownClient (client=0x9727468)
    at ../../dix/dispatch.c:3424
        really_close_down = 1
#7  0x0808d010 in Dispatch () at ../../dix/dispatch.c:467
        result = 1
        client = 0x9727468
        nready = 0
        start_tick = 38480
#8  0x08072515 in main (argc=9, argv=0xbfd61674, envp=0xbfd6169c)
    at ../../dix/main.c:397
        i = <value optimized out>
        alwaysCheckForInput = {0, 1}