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From:   Dave Airlie <airlied@gmail.com>
Date:   Mon, 13 Feb 2023 12:57:32 +1000
Message-ID: <CAPM=9tz+wksJTvMi_4Ef7XWezfH0ReN2se189s8Q=obJjHC+Fw@mail.gmail.com>
Subject: Re: linux-6.2-rc4+ hangs on poweroff/reboot: Bisected
To:     Chris Clayton <chris2553@googlemail.com>
Cc:     Linux regressions mailing list <regressions@lists.linux.dev>,
        Karol Herbst <kherbst@redhat.com>,
        Ben Skeggs <skeggsb@gmail.com>, bskeggs@redhat.com,
        Lyude Paul <lyude@redhat.com>,
        ML nouveau <nouveau@lists.freedesktop.org>,
        LKML <linux-kernel@vger.kernel.org>,
        ML dri-devel <dri-devel@lists.freedesktop.org>
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On Sun, 12 Feb 2023 at 00:43, Chris Clayton <chris2553@googlemail.com> wrote:
>
>
>
> On 10/02/2023 19:33, Linux regression tracking (Thorsten Leemhuis) wrote:
> > On 10.02.23 20:01, Karol Herbst wrote:
> >> On Fri, Feb 10, 2023 at 7:35 PM Linux regression tracking (Thorsten
> >> Leemhuis) <regressions@leemhuis.info> wrote:
> >>>
> >>> On 08.02.23 09:48, Chris Clayton wrote:
> >>>>
> >>>> I'm assuming  that we are not going to see a fix for this regression before 6.2 is released.
> >>>
> >>> Yeah, looks like it. That's unfortunate, but happens. But there is still
> >>> time to fix it and there is one thing I wonder:
> >>>
> >>> Did any of the nouveau developers look at the netconsole captures Chris
> >>> posted more than a week ago to check if they somehow help to track down
> >>> the root of this problem?
> >>
> >> I did now and I can't spot anything. I think at this point it would
> >> make sense to dump the active tasks/threads via sqsrq keys to see if
> >> any is in a weird state preventing the machine from shutting down.
> >
> > Many thx for looking into it!
>
> Yes, thanks Karol.
>
> Attached is the output from dmesg when this block of code:
>
>         /bin/mount /dev/sda7 /mnt/sda7
>         /bin/mountpoint /proc || /bin/mount /proc
>         /bin/dmesg -w > /mnt/sda7/sysrq.dmesg.log &
>         /bin/echo t > /proc/sysrq-trigger
>         /bin/sleep 1
>         /bin/sync
>         /bin/sleep 1
>         kill $(pidof dmesg)
>         /bin/umount /mnt/sda7
>
> is executed immediately before /sbin/reboot is called as the final step of rebooting my system.
>
> I hope this is what you were looking for, but if not, please let me know what you need

Another shot in the dark, but does nouveau.runpm=0 help at all?

Dave.