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From:   Alex Deucher <alexdeucher@gmail.com>
Date:   Thu, 6 Oct 2022 15:28:28 -0400
Message-ID: <CADnq5_Of-8ZyBxee0fZ=0x-eV-2NX_+e9sd-9nmuHdLugSHp2g@mail.gmail.com>
Subject: Re: [git pull] drm for 6.1-rc1
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Dave Airlie <airlied@gmail.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        LKML <linux-kernel@vger.kernel.org>,
        dri-devel <dri-devel@lists.freedesktop.org>
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On Thu, Oct 6, 2022 at 2:48 PM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> On Tue, Oct 4, 2022 at 8:42 PM Dave Airlie <airlied@gmail.com> wrote:
> >
> > Lots of stuff all over, some new AMD IP support and gang
> > submit support [..]
>
> Hmm.
>
> I have now had my main desktop lock up twice after pulling this.
> Nothing in the dmesg after a reboot, and nothing in particular that
> seems to trigger it, so I have a hard time even guessing what's up,
> but the drm changes are the primary suspect.
>
> I will try to see if I can get any information out of the machine, but
> with the symptom being just a dead machine ...
>
> This is the same (old) Radeon device:
>
>    49:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
> [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev e7)
>
> with dual 4k monitors, running on my good old Threadripper setup.
>
> Again, there's no explicit reason to blame the drm pull, except that
> it started after that merge (that machine ran the kernel with the
> networking pull for a day with no problems, and while there were other
> pull requests in between them, they seem to be fairly unrelated to the
> hardware I have).
>
> But the lockup is so sporadic (twice in the last day) that I really
> can't bisect it, so I'm afraid I have very very little info.
>
> Any suggestions?

Maybe you are seeing this which is an issue with GPU TLB flushes which
is kind of sporadic:
https://gitlab.freedesktop.org/drm/amd/-/issues/2113
Are you seeing any GPU page faults in your kernel log?

Alex