linux-kernel - Re: v4.20-rc1: list_del corruption on thinkpad x220

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Message-ID: <20181124152352.GA9548@amd>
Date:   Sat, 24 Nov 2018 16:23:52 +0100
From:   Pavel Machek <pavel@....cz>
To:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Cc:     bp@...en8.de, hpa@...or.com,
        kernel list <linux-kernel@...r.kernel.org>, mingo@...hat.com,
        tglx@...utronix.de, x86@...nel.org, jani.nikula@...ux.intel.com,
        rodrigo.vivi@...el.com, intel-gfx@...ts.freedesktop.org,
        chris@...is-wilson.co.uk
Subject: Re: v4.20-rc1: list_del corruption on thinkpad x220

Hi!

> > > There's one similar for nouveau in Bugzilla, but it seems like a genuine
> > > memory corruption (1 bit flipped):
> > > 
> > > https://bugs.freedesktop.org/show_bug.cgi?id=84880
> > > 
> > > Any extra information would be of use :)
> > > 
> > > Regards, Joonas
> > > 
> > > PS. Could you open a bug to Bugzilla, it'll help to collect the
> > > information in one consolidated place:
> > > 
> > > https://01.org/linuxgraphics/documentation/how-report-bugs
> > 
> > I prefer email... certainly for bugs that can't be reproduced.
> 
> By adding it to the Bugzilla it may be recognized by somebody else
> who is experiencing a similar issue. Internet points are not deducted
> for submitting bugs in good faith, even if they get closed as
> NOTABUG.

Feel free to copy from email to bugzilla :-).

> It sounds like you've hit the same signature twice, so it may very well
> be reproducible. Does flightgear have some demo mode where you could
> leave it running a heavy scene overnight?

I'm not sure if it was same signature twice. I had two lockups, but
IIRC only investigated one.

Not really a demo mode. I can put plane on autopilot, but eventually
gas runs out. (And I guess window needs to be visible for test to be
effective.) I tried today, but it did not crash.

Do you have something else I could run to do the testing?

> Were you running 4.19 kernel previously, distro one or vanilla? A full
> dmesg from a boot would be appreciated (from kernel where you didn't
> experience issues, and from one where you do).

Recent kernels I'm running are self-compiled.

> We actually have a well defined process and personnel to look into the
> Bugzilla entries, so it'd still be helpful to have this logged to
> Bugzilla.

If I can reproduce it, it makes sense to create bugzilla entry.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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