(gdb) bt
#0  0x0086b422 in __kernel_vsyscall ()
#1  0x002d46d0 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0x002d6098 in abort () from /lib/tls/i686/cmov/libc.so.6
#3  0x0031224d in ?? () from /lib/tls/i686/cmov/libc.so.6
#4  0x00318604 in ?? () from /lib/tls/i686/cmov/libc.so.6
#5  0x0031a5b6 in free () from /lib/tls/i686/cmov/libc.so.6
#6  0x080a7a61 in Xfree (ptr=0x0) at ../../os/utils.c:1159
#7  0x08129420 in ProcessOtherEvent (ev=0x944e298, device=0xbec2d38) at ../../Xi/exevents.c:953
#8  0x08151ec8 in ProcessPointerEvent (ev=0x944e298, mouse=0xbec2d38) at ../../xkb/xkbAccessX.c:732
#9  0x0809fb05 in mieqProcessDeviceEvent (dev=0xbec2d38, event=0x944e298, screen=0x0) at ../../mi/mieq.c:403
#10 0x081056b8 in ProcXTestFakeInput (client=<value optimized out>) at ../../Xext/xtest.c:418
#11 0x0806cf87 in Dispatch () at ../../dix/dispatch.c:426
#12 0x080674b5 in main (argc=10, argv=0xbff73ac4, envp=0xbff73af0) at ../../dix/main.c:283
(gdb) print ev->any.type == ET_Raw
$11 = 1
(gdb)