linux-kernel - Re: [PATCH RFC 0/3] generalize panic

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Message-ID: <49efb43a-703e-495a-b076-dd386eb65e81@linux.dev>
Date: Fri, 9 May 2025 10:26:23 +0800
From: Lance Yang <lance.yang@...ux.dev>
To: mhiramat@...nel.org, llong@...hat.com
Cc: Feng Tang <feng.tang@...ux.alibaba.com>, Petr Mladek <pmladek@...e.com>,
 Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH RFC 0/3] generalize panic_print's dump function to be

Cc Masami and Waiman

On 2025/5/7 18:43, Feng Tang wrote:
> When working on kernel stability issues, panic, task-hung and
> software/hardware lockup are frequently met. And to debug them, user
> may need lots of system information at that time, like task call stacks,
> lock info, memory info etc.
> 
> panic case already has panic_print_sys_info() for this purpose, and has
> a 'panic_print' bitmask to control what kinds of information is needed,
> which is also helpful to debug other task-hung and lockup cases.
> 
> So this patchset extract the function out, and make it usable for other
> cases which also need system info for debugging.
> 
> Locally these have been used in our bug chasing for stablility issues
> and was helpful.
> 
> Please help to review, thanks!
> 
> - Feng
> 
> Feng Tang (3):
>    kernel/panic: generalize panic_print's function to show sys info
>    kernel/hung_task: add option to dump system info when hung task
>      detected
>    kernel/watchdog: add option to dump system info when system is locked
>      up
> 
>   include/linux/panic.h | 12 ++++++++++++
>   kernel/hung_task.c    | 29 +++++++++++++++-------------
>   kernel/panic.c        | 44 +++++++++++++++++++++----------------------
>   kernel/watchdog.c     | 11 +++++++++++
>   4 files changed, 61 insertions(+), 35 deletions(-)
>