The problem seems to be that there are negative coordinates being passed
in to ProcPolySegment:
(gdb) p/x *(xSegment*)&((xPolySegmentReq *)0x2918e1c)[1]
$11 = {x1 = 0x24, y1 = 0x10, x2 = 0xfffe, y2 = 0xffff}
I don't know who is supposed to catch this. Looking at the call
sequence, nobody really makes sure that these values are in bounds.
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https://bugs.launchpad.net/bugs/416421
Title:
[gm45] X crash on X200s with dual monitors (using DisplayPort)
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