The trace shows it's failing in privates.c

#0  0x00000000004346ca in dixLookupPrivate (privates=0x198, key=0x7d96e0)
    at ../../dix/privates.c:79
        ptr = <value optimized out>

However the code in question doesn't make it clear where the failure is:

static _X_INLINE int
privateExists(PrivateRec **privates, const DevPrivateKey key)
{
    return *key && *privates &&
        (*privates)[0].state > *key &&
        (*privates)[*key].state;
}

Guess the next step for this one is to go upstream.  Still would be
wonderful to get a more detailed backtrace though.

** Changed in: xorg-server (Ubuntu)
   Importance: Medium => High
       Status: Incomplete => Triaged

-- 
Xorg crashed with SIGSEGV in dixLookupPrivate()
https://bugs.launchpad.net/bugs/328937
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