[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
Thu Mar 22 20:15:03 UTC 2018


--- Comment #5 from Roland Scheidegger <sroland at vmware.com> ---
(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

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

I disagree that loop unrolling isn't a problem. Clearly there's two problems:
- loop unrolling shouldn't turn perfectly fine loops into loops which don't
terminate, this is what this bug is about.
- gpu reset should work reliably

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