linux-kernel - Re: selftests: tc-testing: tdc.sh: WARNING: at kernel/locking/lockdep.c:1226 lockdep_register

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Date: Tue, 30 Apr 2024 12:17:41 +0200
From: Davide Caratti <dcaratti@...hat.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: lkft-triage@...ts.linaro.org, regressions@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, jhs@...atatu.com, 
	xiyou.wangcong@...il.com, jiri@...nulli.us, cpaasch@...le.com, 
	pabeni@...hat.com, xmu@...hat.com, maxim@...valent.com, edumazet@...gle.com, 
	anders.roxell@...aro.org, dan.carpenter@...aro.org, arnd@...db.de, 
	Linux Kernel Functional Testing <lkft@...aro.org>
Subject: Re: selftests: tc-testing: tdc.sh: WARNING: at kernel/locking/lockdep.c:1226
 lockdep_register_key

hello,

On Tue, Apr 30, 2024 at 12:17 AM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> While running selftests: tc-testing: tdc.sh the following kernel warnings,
> kernel Bug, kernel oops and kernel panic noticed with Linux next-20240429
> tag kernel as per the available data.
>
> This build config is from kselftest merge config[1].
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>
> selftests: tc-testing: tdc.sh log and crash log

the problem is created by [1]. I think that at least we need to guard
against failures to allocate sch->cpu_bstats and sch->cpu_qstats,
otherwise the dynamic key is registered but never unregistered (though
the key is freed  in the error path of of qdisc_alloc() ). But there
might be also something else; however, I can reproduce some similar
splat, will follow-up on the list.

sorry for the noise,
-- 
davide

[1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=af0cb3fa3f9ed258d14abab0152e28a0f9593084