linux-kernel - Re: Bug in Kernel 6.8.x, 6.9.x Causing Trace/Panic During Shutdown/Reboot

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Date: Fri, 24 May 2024 12:50:08 +0200
From: "Linux regression tracking (Thorsten Leemhuis)"
 <regressions@...mhuis.info>
To: Ilkka Naulapää <digirigawa@...il.com>,
 stable@...r.kernel.org
Cc: regressions@...ts.linux.dev, Steven Rostedt <rostedt@...dmis.org>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: Bug in Kernel 6.8.x, 6.9.x Causing Trace/Panic During
 Shutdown/Reboot

[CCing a few people]

On 24.05.24 12:31, Ilkka Naulapää wrote:
> 
> I have encountered a critical bug in the Linux vanilla kernel that
> leads to a kernel panic during the shutdown or reboot process. The
> issue arises after all services, including `journald`, have been
> stopped. As a result, the machine fails to complete the shutdown or
> reboot procedure, effectively causing the system to hang and not shut
> down or reboot.

Thx for the report. Not my area of expertise, so take this with a gain
of salt. But given the versions your mention in your report and the
screenshot that mentioned tracefs_free_inode I suspect this is caused by
baa23a8d4360d ("tracefs: Reset permissions on remount if permissions are
options"). A few fixes for it will soon hit mainline and are meant to be
backported to affected stable trees:

https://lore.kernel.org/all/20240523212406.254317554@goodmis.org/
https://lore.kernel.org/all/20240523174419.1e5885a5@gandalf.local.home/

You might want to try them – or recheck once they hit the stable trees
you are about. If they don't work, please report back.

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
If I did something stupid, please tell me, as explained on that page.

> Here are the details of the issue:
> 
> - Affected Versions: Before kernel version 6.8.10, the bug caused a
> quick display of a kernel trace dump before the shutdown/reboot
> completed. Starting from version 6.8.10 and continuing into version
> 6.9.0 and 6.9.1, this issue has escalated to a kernel panic,
> preventing the shutdown or reboot from completing and leaving the
> machine stuck.
> 
> - Symptoms:
>   - In normal shutdown/reboot scenarios, the kernel trace dump briefly
> appears as the last message on the screen.
>   - In rescue mode, the kernel panic message is displayed. Normally it
> is not shown.
> 
> Since `journald` is stopped before this issue occurs, no textual logs
> are available. However, I have captured two pictures illustrating
> these related issues, which I am attaching to this email for your
> reference. Also added my custom kernel config.
> 
> Thank you for your attention to this matter. Please let me know if any
> additional information is required to assist in diagnosing and
> resolving this bug.
> 
> Best regards,
> 
> Ilkka Naulapää