linux-kernel - Re: arm64/juno-r2: Kernel panic in cgroup_fj

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Message-ID: <CANDhNCpWWNpBQfeGq_Bj1pEWTYULJGaubTuPJ2Yxjg4_ESzgBw@mail.gmail.com>
Date: Fri, 5 Sep 2025 10:50:48 -0700
From: John Stultz <jstultz@...gle.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: open list <linux-kernel@...r.kernel.org>, 
	Linux ARM <linux-arm-kernel@...ts.infradead.org>, Cgroups <cgroups@...r.kernel.org>, 
	lkft-triage@...ts.linaro.org, Linux Regressions <regressions@...ts.linux.dev>, 
	Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, 
	Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...nel.org>, 
	Ben Copeland <benjamin.copeland@...aro.org>, Anders Roxell <anders.roxell@...aro.org>, 
	Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Tejun Heo <tj@...nel.org>, 
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: arm64/juno-r2: Kernel panic in cgroup_fj_stress.sh on next-20250904

On Fri, Sep 5, 2025 at 6:21 AM Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>
> Kernel warnings and a panic were observed on Juno-r2 while running
> LTP controllers (cgroup_fj_stress.sh) on the Linux next-20250904 with
> SCHED_PROXY_EXEC=y enabled build.
>
> Regression Analysis:
> - New regression? yes
> - Reproducibility? yes
>
> First seen on next-20250904
> Bad: next-20250904
> Good: next-20250822
>
> Test regression: next-20250904 juno-r2 cgroup_fj_stress.sh kernel panic
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Thank you for the testing and the report here!

> Juno-r2:
>  * LTP controllers
>    * cgroup_fj_stress.sh
>
> Test crash:
> cgroup_fj_stress_net_cls_1_200_one:
> [  365.917504] /usr/local/bin/kirk[402]: cgroup_fj_stress_net_cls_1_200_one:
> start (command: cgroup_fj_stress.sh net_cls 1 200 one)
> [  374.230110] ------------[ cut here ]------------
> [  374.230132] WARNING: lib/timerqueue.c:55 at
> timerqueue_del+0x68/0x70, CPU#5: swapper/5/0

This looks like we are removing a timer that was already removed from the queue.

I don't see anything obvious right away in the delta that would clue
me into what's going on, but I'll try to reproduce this.

thanks
-john