linux-kernel - Re: linux-6.2-rc4+ hangs on poweroff/reboot: Bisected

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Date:   Wed, 15 Feb 2023 11:36:29 +0100
From:   "Linux regression tracking #update (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Chris Clayton <chris2553@...glemail.com>,
        Dave Airlie <airlied@...il.com>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Karol Herbst <kherbst@...hat.com>,
        Ben Skeggs <skeggsb@...il.com>, bskeggs@...hat.com,
        Lyude Paul <lyude@...hat.com>,
        ML nouveau <nouveau@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: linux-6.2-rc4+ hangs on poweroff/reboot: Bisected

On 13.02.23 10:14, Chris Clayton wrote:
> On 13/02/2023 02:57, Dave Airlie wrote:
>> On Sun, 12 Feb 2023 at 00:43, Chris Clayton <chris2553@...glemail.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@...mhuis.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
> 
> Thanks Dave. [...]
FWIW, in case anyone strands here in the archives: the msg was
truncated. The full post can be found in a new thread:

https://lore.kernel.org/lkml/e0b80506-b3cf-315b-4327-1b988d86031e@googlemail.com/

Sadly it seems the info "With runpm=0, both reboot and poweroff work on
my laptop." didn't bring us much further to a solution. :-/ I don't
really like it, but for regression tracking I'm now putting this on the
back-burner, as a fix is not in sight.

#regzbot monitor:
https://lore.kernel.org/lkml/e0b80506-b3cf-315b-4327-1b988d86031e@googlemail.com/
#regzbot backburner: hard to debug and apparently rare
#regzbot ignore-activity

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.

#regzbot ignore-activity