[Bug 32911] Video playback is unreliable with radeon kms

[bugzilla-daemon at freedesktop.org]

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

--- Comment #1 from Siarhei Siamashka <siarhei.siamashka at gmail.com> 2011-01-08 20:59:34 PST ---
OK, some more information. Got a few other similar mild failures (so that the
box is still accessible via ssh) and they have different backtraces, but also
seem to be memory allocation related. Right now my guess it that radeon kms is
causing some memory corruption in the kernel.

I tried to switch to SLUB allocator and enable SLUB_DEBUG. Unfortunately this
change did not help me to catch any problems yet. On a somewhat positive side,
the mild reliability problems also have disappeared (for example it does not
seem to easily fail on browser flash video playback anymore).

Still there is a testcase which is guaranteed to kill the system for me. It
involves launching gl-117 game (using llvmpipe for 3D) in one window so that it
runs its demo, and also starting scaled video playback in mplayer in another
window so that both windows are visible on screen at the same time. In about
less than 15 minutes and typically a lot faster, the whole system deadlocks.
And the box is totally dead, I even can't connect to it with ssh, so I have
neither backtraces nor clues about what could have happened.

Anyway, I'm going to keep KMS enabled for a while, maybe some some other easier
to debug testcases will be discovered and the driver bug(s?) could be found.

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