Bug#616301: xserver-xorg-video-radeon:screen goes black, system hangs after 2sec:[youtube(FF/Opera)-reset req.]

[Ben Hutchings]

On Sun, 2011-03-06 at 13:08 -0500, Alex Deucher wrote:
> On Fri, Mar 4, 2011 at 8:50 PM, Ben Hutchings <ben at decadent.org.uk> wrote:
> > On Fri, 2011-03-04 at 21:01 +0200, Faidon Liambotis wrote:
> >> severity 616301 critical
> >> thanks
> >
> > No, not unless it will affect a large proportion of users.
> >
> >> My system locks up whenever I click on a YouTube video link since
> >> yesterday. I can probably live without YouTube :), but in any case this
> >> shouldn't happen.
> >>
> >> This isn't a singled out case nor in exotic, possibly faulty, hardware.
> >> It's on a standard 1½-year old Dell OptiPlex 780 desktop with a Radeon
> >> HD card (one of the standard configurations) and this is on a stock
> >> squeeze system.
> >>
> >> The findings so far seem to suggest this is a Mesa issue; I'd probably
> >> file it under "Linux kernel bugs" (or even DoS bugs) but I'm not sure
> >> where to properly file such bugs in the post-KMS stack world.
> >
> > If there is a kernel driver involved then it should be assigned to the
> > kernel.  Even without KMS, a Mesa driver should be considered untrusted
> > and should not be able to trigger a crash or hang.  With KMS, this
> > applies to the X driver too.
> >
> 
> With or without KMS, the userspace acceleration drivers can certainly
> cause GPU hangs if the 3D engine is programmed with some combination
> of commands it doesn't like.

You can't solve the halting problem but you can implement a watchdog,
can't you?

Ben.

-- 
Ben Hutchings
Once a job is fouled up, anything done to improve it makes it worse.
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