[Bug 32911] Random memory corruption if using more than 4GiB of RAM on Core i7/P55 with Radeon KMS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32911

Siarhei Siamashka <siarhei.siamashka at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Video playback is           |Random memory corruption if
                   |unreliable with radeon kms  |using more than 4GiB of RAM
                   |                            |on Core i7/P55 with Radeon
                   |                            |KMS
            Product|xorg                        |DRI
          Component|Driver/Radeon               |DRM/Radeon
         AssignedTo|xorg-driver-ati at lists.x.org |dri-devel at lists.freedesktop
                   |                            |.org
          QAContact|xorg-team at lists.x.org       |

--- Comment #2 from Siarhei Siamashka <siarhei.siamashka at gmail.com> 2011-01-22 17:06:19 PST ---
Appears that the memory just gets randomly corrupted. When running gl-117 game
demo using mesa 7.9 llvmpipe, and also running memtester program [1] at the
same time so that the rest of the available memory gets tested, memtester is
typically able to detect memory corruption before the system goes down in a
spectacular way.

The system used to have 4 memory sticks installed, 2GiB each. Memory corruption
disappears if only one 2GiB stick is left (tested for more than a week without
problems) or using 2GiB+2GiB configuration (just started using this, appears to
be stable so far). Installing 6GiB or 8GiB of memory in various ways (trying
different placement in slots on the motherboard) makes the issue reproducible
again.

It could be either a problem in radeon kernel drivers, or just defective
hardware (motherboard?, PSU?, CPU?, memory?, graphics card?). Though memtest86+
does not detect problems and the system appears to be stable when used
"headless" even with the intensive CPU/RAM usage. Anyway, unless somebody else
manages to reproduce the same problem, there is no definite answer to this
question. There is nothing else to be added here (other than dmesg and Xorg
logs). So probably that's my last comment here unless I somehow manage to
narrow down the bug and make a patch. Thanks. The bug can be closed if you
want.

1. http://pyropus.ca/software/memtester/

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