linux-kernel - Re: [BUG] Warning and NULL-ptr dereference in amdgpu driver with 5.18

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Date:   Thu, 12 May 2022 09:47:29 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Jörg Rödel <jroedel@...e.de>
Cc:     "Wentland, Harry" <Harry.Wentland@....com>,
        "Siqueira, Rodrigo" <Rodrigo.Siqueira@....com>,
        "Kazlauskas, Nicholas" <nicholas.kazlauskas@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian Koenig <christian.koenig@....com>,
        xinhui pan <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Warning and NULL-ptr dereference in amdgpu driver with 5.18

On Thu, May 12, 2022 at 4:35 AM Jörg Rödel <jroedel@...e.de> wrote:
>
> On Tue, May 10, 2022 at 04:41:57PM -0400, Alex Deucher wrote:
> > Does setting amdgpu.runpm=0 on the kernel command line in grub help?
> > If so, that should fixed with:
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f95af4a9236695caed24fe6401256bb974e8f2a7
>
> Unfortunatly, no, this option doesn't help. Tested with v5.18-rc6, full
> dmesg attached.
>
> Any idea what the BadTLP messages migh be caused by?

Are those new?  Maybe the card is not seated correctly?  Can you try
another slot?

As for the null pointer defer in the display code, @Wentland, Harry
any ideas?  I don't see why that should happen.  Maybe some hotplug
pin is faulty or the display has input detection and that is causing
some sort of hotplug interrupt that causes a race somewhere in the
driver?  Can you make sure the monitor connector is firmly seated on
the GPU?

Alex


>
> Regards,
>
>         Joerg
>
> --
> Jörg Rödel
> jroedel@...e.de
>
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