linux-kernel - Intel GPU memory corruption

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Date:   Wed, 25 May 2022 15:47:16 +0200
From:   Baltazár Radics <baltazar.radics@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Intel GPU memory corruption

Hello!

I have a Lenovo Thinkpad T460 with an integrated `Intel Corporation
Skylake GT2 [HD Graphics 520]` GPU. Whenever there's intensive usage of
it, after a while I experience memory corruption. Under normal usage,
this results in random programs segfaulting for example.

I have done several memory tests, including the Lenovo hardware
diagnostics included with my BIOS and the userspace utility `memtester`
as well. When the GPU is not used, no tests have found any issues, so
I'm fairly certain my actual RAM sticks are fine.

However, when I run e.g. `vkmark` or `mpv` alongside `memtester`, it
will report issues after one or two loops. During the time I ran it,
all failures happened at the same offset.

Based on this, I suspect the video driver is the culprit somehow, but
I'm still not entirely certain it's not a hardware issue. If anyone has
ideas on how to track this down, I'd be happy to do some tests.