Did a lot of debugging yesterday using the latest libdrm git tree, and
the problem appears to be in /libdrm/intel/intel_bufmgr_fake.c.
Specifically around the drm_intel_fake_bo_unreference_locked function
(line 873).  The function has a "funky" for loop that calls itself, and
I'm pretty sure it's not properly checking all the blocks it attempts to
free....thus freeing up memory it shouldn't.  I was actually able to
switch VTs after adding some memory checks and tweaking the loop, but
there's still a memory "stomping" issue in the function...as the X
session will simply hang and issue a backtrace after a few minutes of
activity. Will try to continue to debug today. I will also check out the
git tree history of this file as well.

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[iGM45] X exits when switching ttys on 2.6.3 unless NoAccel used
https://bugs.launchpad.net/bugs/345714
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