Comment 6 for bug 311254

Yes, it's easily reproducible.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fef0719c6f0 (LWP 7190)]
0x000000000053d155 in CopyKeyClass (device=0x1b55fa0, master=0x1ac2090)
    at /usr/include/bits/string3.h:52
52 return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
(gdb) bt full
#0 0x000000000053d155 in CopyKeyClass (device=0x1b55fa0, master=0x1ac2090)
    at /usr/include/bits/string3.h:52
        mk = (KeyClassPtr) 0x0
        dk = (KeyClassPtr) 0x1b566c0
        lastMapNotifyDevice = (DeviceIntPtr) 0x1ac2740
#1 0x00000000004cfa93 in mieqProcessInputEvents () at ../../mi/mieq.c:361
        handler = (mieqHandler) 0
        e = <value optimized out>
        type = <value optimized out>
        nevents = 1
        i = <value optimized out>
        screen = (ScreenPtr) 0x1937830
        event = (xEvent *) 0x2944fe0
        master_event = (xEvent *) 0x0
        dev = (DeviceIntPtr) 0x1b55fa0
        master = (DeviceIntPtr) 0x1ac2090
#2 0x0000000000484669 in ProcessInputEvents ()
    at ../../../../hw/xfree86/common/xf86Events.c:174
        x = 0
        y = 8232584
#3 0x000000000044d591 in Dispatch () at ../../dix/dispatch.c:363
        result = 0
        client = (ClientPtr) 0x1b337d0
        nready = -1
        start_tick = <value optimized out>
#4 0x00000000004332bd in main (argc=10, argv=0x7fff0f1bde78,
    envp=<value optimized out>) at ../../dix/main.c:383
        i = 1
        alwaysCheckForInput = {0, 1}