Newer xorg-servers have some kind of automatic input device detection
on server startup. I discovered a configuration that makes the server
crash during initialisation. I'm talking about crashes on
xorg-server-1.1.99.901 and xorg-server-1.1.99.902.

This ServerLayout works:
Section "ServerLayout"
       Identifier      "normal"
       Screen          "Screen0"
       Inputdevice     "Mouse0" "Corepointer"
       Inputdevice     "Keyboard0"
EndSection

This ServerLayout also works (autodetection):
Section "ServerLayout"
       Identifier      "normal"
       Screen          "Screen0"
EndSection

This one crashes (say: semi-automatic):
Section "ServerLayout"
       Identifier      "normal"
       Screen          "Screen0"
       Inputdevice     "Mouse0" "Corepointer"
EndSection

The crash only happens when using anything but "mouse" or "void" (for example:
"evdev") in the Inputdevice section of Mouse0.

I looked into this problem further and found this:
xorg-server-1.1.1 is OK
xorg-server-1.1.99.901 is CRASHING
xorg-server-1.1.99.902 is CRASHING

The code causing the crash is this (hw/xfree86/common/xf86Config.c):
1616     for (i = servlayoutp->inputs; i->driver; i++) {
1617         if (!strcmp(i->driver, "void") || !strcmp(i->driver, "mouse")) {
1618             found = 1; break;
1619         }
1620     }

If this code wants to iterate over the inputs, then i->diver must be set to NULL
at the end of the array or the code crashes. Use i->identifier instead OR the
patch I put on my webspace:
http://gerte.nietbelangrijk.nl/xorg-server-segpatch.txt

Thank you,
Gerte