[Bug 37168] Regression: Kernel hard-lock when running Second Life

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37168

--- Comment #4 from Sean McNamara <gm.potato.ul at gmail.com> 2011-06-07 10:13:26 PDT ---
(In reply to comment #3)
> Followup: I also get the following messages spewed to dmesg every single frame,
> regardless if I'm using Mesa 7.10.2 or git master or anything in between. I'm
> not sure if this is related to the problem or just noise. But I suspect that
> it's unrelated, because I don't experience any symptoms of failure (crash, OOM)
> with 7.10.2, and the messages still get spewed. The frequency is about once
> every frame, or a bit more often. Maybe as frequently as once per kernel tick
> (~1000 Hz timer).
> 
> [  564.159042] DRHD: handling fault status reg 2
> [  564.159248] DMAR:[DMA Write] Request device [04:00.0] fault addr 44bc0000 
> [  564.159249] DMAR:[fault reason 05] PTE Write access is not set
> 
> The DRHD line appears less frequently, but the DMAR lines are always grouped
> together like that. I tried running other GL apps and it doesn't happen there.

The DMAR and DRHD lines appear to be related to my ASUS P6T Deluxe's broken
BIOS. Even the latest version of this BIOS is unable to handle the Core i7's
VT-d feature correctly. On boot-up, the kernel complains very loudly about my
broken BIOS and the incorrect functioning of the chipset IOMMU; when I disable
VT-d, all of this complaining goes away, as do these DMAR / DRHD faults.

Unfortunately, when disabling VT-d, I still have the memory leak.

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