Just making some notes here: Before xf86XVEnterVT calls WalkTree, it
calls ScreenPriv->EnterVT which is CMapEnterVT:
(gdb) print *(XF86XVScreenPtr) ((XvScreenPtr)
pScreen->devPrivates[XF86XvScreenIndex].ptr)->devPriv.ptr
$24 = {DestroyWindow = 0xb7ce4a00 <XvDestroyWindow>, ClipNotify = 0xb7c73a60
<DRIClipNotify>, WindowExposures = 0xb7c72a30 <DRIWindowExposures>, AdjustFrame
= 0xb7c73200 <DRIAdjustFrame>, EnterVT = 0x80d08d0 <CMapEnterVT>, LeaveVT =
0xaf99b480 <XAALeaveVT>, videoGC = 0x0}
--
Xorg crashed with SIGSEGV in xf86XVRegetVideo
https://bugs.launchpad.net/bugs/126820
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