Hmm, this line is setting an invalid pointer:

1012 WacomDevicePtr priv = (WacomDevicePtr)PRIVATE(pWcm);

PRIVATE is defined as XI_PRIVATE, which in turn is defined like this in
xf86Xinput.h:

#define XI_PRIVATE(dev) \
        (((LocalDevicePtr)((dev)->public.devicePrivate))->private)

So something up above this code is setting that private parameter to a
bad value.  (Sort of looks like a null pointer that's been bit
shifted...)

-- 
Xorg crashed with SIGSEGV in ActivateDevice()
https://bugs.launchpad.net/bugs/357544
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