The code appears to be failing while dereferencing the reg pointer in
this (inlined) routine:

static inline int RegionNumRects(RegionPtr reg) {
    return ((reg)->data ? (reg)->data->numRects : 1);
}


So, this looks more like memory corruption than a simple pointer deref error.

Have you had further X server crashes like this one, or was it just the
one?

** Changed in: xorg-server (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/927674

Title:
  Xorg crashed with SIGSEGV in RegionNumRects()

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