[Bug 105670] [regression][hang] Trine1EE hangs GPU after loading screen on Mesa3D-17.3 and later

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Mar 25 20:25:28 UTC 2018


--- Comment #14 from almos <aaalmosss at gmail.com> ---
(In reply to Roland Scheidegger from comment #5)
> (In reply to almos from comment #4)
> > The problem is not loop unrolling. The problem is that userspace code can
> > hang the GPU unrecoverably, and thus bringing down the entire system.
> > 
> > BTW I can confirm this on Pitcairn with radeon drm in linux 4.15.
> There isn't much you can do about shaders not terminating (loop limiting in
> llvmpipe is quite a hack, you could legitimately have a loop which has more
> iterations).
You can detect the stall and kill the process that sent the drawing command.

> But yes, gpu reset actually working reliably would be nice. I haven't really
> seen it succeed lately neither (but it can happen...).
It wouldn't be nice. It's essential.

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