[BISECTED][BUG] Bug 91133 : GPU hang on G45

[BISECTED][BUG] Bug 91133 : GPU hang on G45

[Vincent Legoll]

Hello,

I finally managed to bisect properly that GPU hang, more info here:
https://bugs.freedesktop.org/show_bug.cgi?id=91133

But unfortunately the culprit commit does not revert properly from
current linus tree.

I first met that bug about 2 monthes ago, but had no time to investigate
back then, so I went back to a previous working kernel, and then a month
from now, decided to dig in.

It took a very long time because I'm on an old laptop, not very powerful,
and without enough space to use ccache usefuly, so the many recompiles
cycles did take an awfully long time.

And also the first bisection attempt failed, probably because of config
variations. So, it was really painful, but that pain is behind now.

How do we follow from here to a final fix ?

I can test patches, the bug reproducing is fairly accurate and quick...

-- 
Vincent Legoll
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Re: [BISECTED][BUG] Bug 91133 : GPU hang on G45

[Vincent Legoll]

> But unfortunately the culprit commit does not revert properly from
> current linus tree.

In fact the patch does revert with a bit of fuzz on current linus's tree,
and I tested the bug disappear with the revert.

Should I ask on LKML for a revert, during the bug fixing process ?

-- 
Vincent Legoll
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Re: [BISECTED][BUG] Bug 91133 : GPU hang on G45

[Daniel Vetter]

On Wed, Jul 22, 2015 at 09:53:48PM +0200, Vincent Legoll wrote:
> > But unfortunately the culprit commit does not revert properly from
> > current linus tree.
> 
> In fact the patch does revert with a bit of fuzz on current linus's tree,
> and I tested the bug disappear with the revert.
> 
> Should I ask on LKML for a revert, during the bug fixing process ?

Would be great if you can submit the revert (with bugzilla link and
signed-off-by and everything to intel-gfx here). I need to double-check
that there's nothing else we need to revert. Also please cc all the
original authors/reviewers of the offending patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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