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Date:   Wed, 21 Nov 2018 12:54:49 +0100
From:   Pavel Machek <pavel@ucw.cz>
To:     Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc:     bp@alien8.de, hpa@zytor.com,
        kernel list <linux-kernel@vger.kernel.org>, mingo@redhat.com,
        tglx@linutronix.de, x86@kernel.org, jani.nikula@linux.intel.com,
        rodrigo.vivi@intel.com, intel-gfx@lists.freedesktop.org,
        chris@chris-wilson.co.uk
Subject: Re: v4.20-rc1: list_del corruption on thinkpad x220
Message-ID: <20181121115449.GA32455@amd>
References: <20181108175803.GA10785@amd>
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Hi!

> > My machine locked hard (thinkpad x220). After reboot, I found this in
> > syslog:
> >=20
> > Sounds like memory corruption..? Does not sound like easy to debug.
>=20
> Were you doing something GPU intense when you experienced the hard hang?
>=20
> And if so, have you been able to hit the issue more than once? At this
> point it doesn't look like anything we've hit previously, so would be
> great to have some more insight into how we could reproduce.

I seen another crash since that, but I don't think it counts at
"easily reproducible".

I may have been running flightgear at that point. That's fairly GPU intensi=
ve.

> There's one similar for nouveau in Bugzilla, but it seems like a genuine
> memory corruption (1 bit flipped):
>=20
> https://bugs.freedesktop.org/show_bug.cgi?id=3D84880
>=20
> Any extra information would be of use :)
>=20
> Regards, Joonas
>=20
> PS. Could you open a bug to Bugzilla, it'll help to collect the
> information in one consolidated place:
>=20
> https://01.org/linuxgraphics/documentation/how-report-bugs

I prefer email... certainly for bugs that can't be reproduced.

Best regards,
								Pavel

> > > > ...otoh, it still looks like an addres, so maybe it is "just" race =
in
> > GPU drivers?
> >=20
> > Any ideas?
> >                                                                 Pavel
> >=20
> > Nov  8 18:35:01 duo CRON[28511]: (root) CMD (command -v debian-sa1 >
> > /dev/null && debian-sa
> > 1 1 1)
> > Nov  8 18:42:57 duo kernel: list_del corruption. prev->next should be
> > ffff8801742b8178, but
> >  was ffffc9000192fec8
> >  Nov  8 18:42:57 duo kernel: ------------[ cut here ]------------
> >  Nov  8 18:42:57 duo kernel: kernel BUG at
> >  /data/fast/l/k/lib/list_debug.c:53!
> >  Nov  8 18:42:57 duo kernel: invalid opcode: 0000 [#1] SMP PTI
> >  Nov  8 18:42:57 duo kernel: CPU: 2 PID: 1082 Comm: i915/signal:1 Not
> >  tainted 4.20.0-rc1+ #3
> >  Nov  8 18:42:57 duo kernel: Hardware name: LENOVO 42872WU/42872WU,
> >  BIOS 8DET74WW (1.44 ) 03
> >  /13/2018
> >  Nov  8 18:42:57 duo kernel: RIP:
> >  0010:__list_del_entry_valid+0x8e/0x90
> >  Nov  8 18:42:57 duo kernel: Code: 66 88 d1 ff 0f 0b 48 89 fe 31 c0 48
> >  c7 c7 90 74 5e 85 e8
> >  53 88 d1 ff 0f 0b 48 89 fe 31 c0 48 c7 c7 c8 74 5e 85 e8 40 88 d1 ff
> >  <0f> 0b 55 48 89 d0 48
> >   8b 52 08 48 89 e5 48 39 f2 75 19 48 8b 32 48
> >   Nov  8 18:42:57 duo kernel: RSP: 0000:ffffc9000196be78 EFLAGS:
> >   00210086
> >   Nov  8 18:42:57 duo kernel: RAX: 0000000000000054 RBX:
> >   ffff8801742b8178 RCX: 00000000000000
> >   00
> >   Nov  8 18:42:57 duo kernel: RDX: 0000000000000000 RSI:
> >   ffff88019e2a53d8 RDI: ffff88019e2a53
> >   d8
> >   Nov  8 18:42:57 duo kernel: RBP: ffffc9000196be78 R08:
> >   ffff880196e2cd10 R09: 00000000000000
> >   00
> >   Nov  8 18:42:57 duo kernel: R10: 00000000e7684eb9 R11:
> >   3863656632393101 R12: ffffc9000196be
> >   c8
> >   Nov  8 18:42:57 duo kernel: R13: ffff88019707e000 R14:
> >   ffff8801742b8080 R15: ffffc9000192fd
> >   d0
> >   Nov  8 18:42:57 duo kernel: FS:  0000000000000000(0000)
> >   GS:ffff88019e280000(0000) knlGS:000
> >   0000000000000
> >   Nov  8 18:42:57 duo kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
> >   0000000080050033
> >   Nov  8 18:42:57 duo kernel: CR2: 00000000ed2bf000 CR3:
> >   000000000581e001 CR4: 00000000000606a0
> >   Nov  8 18:42:57 duo kernel: Call Trace:
> >   Nov  8 18:42:57 duo kernel: intel_breadcrumbs_signaler+0x162/0x330
> >   Nov  8 18:42:57 duo kernel: kthread+0x116/0x150
> >   Nov  8 18:42:57 duo kernel: ? intel_engine_wakeup+0x40/0x40
> >   Nov  8 18:42:57 duo kernel: ? kthread_park+0x90/0x90
> >   Nov  8 18:42:57 duo kernel: ret_from_fork+0x35/0x40
> >   Nov  8 18:42:57 duo kernel: Modules linked in:
> >   Nov  8 18:42:57 duo kernel: ---[ end trace 2f8da183a56f80f6 ]---
> >   Nov  8 18:42:57 duo kernel: RIP:
> >   0010:__list_del_entry_valid+0x8e/0x90
> >   Nov  8 18:42:57 duo kernel: Code: 66 88 d1 ff 0f 0b 48 89 fe 31 c0
> >   48 c7 c7 90 74 5e 85 e8 53 88 d1 ff 0f 0b 48 89 fe 31 c0 48 c7 c7 c8
> >   74 5e 85 e8 40 88 d1 ff <0f> 0b 55 48 89 d0 48 8b 52 08 48 89 e5 48
> >   39 f2 75 19 48 8b 32 48
> >   Nov  8 18:42:57 duo kernel: RSP: 0000:ffffc9000196be78 EFLAGS:
> >   00210086
> >   Nov  8 18:42:57 duo kernel: RAX: 0000000000000054 RBX:
> >   ffff8801742b8178 RCX: 0000000000000000
> >   Nov  8 18:42:57 duo kernel: RDX: 0000000000000000 RSI:
> >   ffff88019e2a53d8 RDI: ffff88019e2a53d8
> >   Nov  8 18:42:57 duo kernel: RBP: ffffc9000196be78 R08:
> >   ffff880196e2cd10 R09: 0000000000000000
> >   Nov  8 18:42:57 duo kernel: R10: 00000000e7684eb9 R11:
> >   3863656632393101 R12: ffffc9000196bec8
> >   Nov  8 18:42:57 duo kernel: R13: ffff88019707e000 R14:
> >   ffff8801742b8080 R15: ffffc9000192fdd0
> >   Nov  8 18:42:57 duo kernel: FS:  0000000000000000(0000)
> >   GS:ffff88019e280000(0000) knlGS:0000000000000000
> >   Nov  8 18:42:57 duo kernel: CS:  0010 DS: 0000 ES: 0000 CR0:
> >   0000000080050033
> >   Nov  8 18:42:57 duo kernel: CR2: 00000000ed2bf000 CR3:
> >   000000000581e001 CR4: 00000000000606a0
> >=20
> > --=20
> > (english) http://www.livejournal.com/~pavelmachek
> > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses=
/blog.html

--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

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