linux-kernel - 4.20.0-rc6-next-20181210, v4.20-rc1: list_del corruption on thinkpad x220, graphics related?

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Date:   Wed, 12 Dec 2018 19:29:02 +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: 4.20.0-rc6-next-20181210, v4.20-rc1: list_del corruption on thinkpad
 x220, graphics related?

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.
> > > 
> > > Well, your documentation suggests you'll deduce my internet points:
> > > 
> > > 	Before filing the bug, please try to reproduce your issue with the
> > > 	latest kernel. Use the latest drm-tip branch from
> > > 	http://cgit.freedesktop.org/drm-tip and build as instructed on our
> > > 	Build Guide.
> > > 
> > > :-)
> > 
> > I'd prefer not to run drm-tip. I'll update to 2.6.20-rc5+ and see if
> > it re-appears (but it takes long time to reproduce :-().
> 
> If we can or can not reproduce the issue with drm-tip, is a very useful
> datapoint for us. If we can not reproduce, it'll be possible to bisect
> which commit fixed it, and backport that. On the other hand, if it's
> still reproducible, we know we're not spending time on something we
> already fixed, and the priority gets a bump.

bisect ... is not practical on something that takes 2 days to reproduce.

> > If you think it is useful, I can try to update my machine to
> > linux-next.
> 
> linux-next is closer to drm-tip, so it's better. Do you have some
> specific reason for not wanting to run drm-tip (but linux-next is still
> ok)?

I already have build/update scripts for -next, and I trust -next not
to store screenshots of my desktop in my master boot record :-).

Anyway, it does happen with -next. This time, chromiums were running,
and crash happened minute? after I exited flightgear. It can be seen
in the logs.

Oh and I might want to mention -- machine was rather deep in swap this
time, as in "mouse jumping when starting fgfs" and "could feel the
chromium being swapped back in". I might have had this situation
before, and just powercycled the machine "because it is so deep in
swap that it will not recover".

top says:

top - 19:18:24 up 2 days,  8:03,  2 users,  load average: 3.02, 3.45,
3.21
Tasks: 141 total,   1 running,  86 sleeping,   0 stopped,   2 zombie
%Cpu(s): 18.8 us,  7.6 sy,  3.0 ni, 68.4 id,  1.3 wa,  0.0 hi,  0.9
si,  0.0 st
KiB Mem:   5967968 total,   663244 used,  5304724 free,    48876
buffers
KiB Swap:  1681428 total,   170904 used,  1510524 free.   446280
cached Mem

....but of course that memory is free once everything died.

Any ideas? Should I go back to v4.19 to see if it happens there, too?


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

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