linux-kernel - Re: [Question] Detecting Sleep-in-Atomic Context in PREEMPT_RT via RV (Runtime Verification) monitor rtapp:sleep

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Message-ID: <87jyz5kuf2.fsf@yellow.woof>
Date: Tue, 02 Dec 2025 12:14:09 +0100
From: Nam Cao <namcao@...utronix.de>
To: Yunseong Kim <ysk@...lloc.com>, Nam Cao <nam.cao@...aro.org>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Tomas Glozar
 <tglozar@...hat.com>, Shung-Hsi Yu <shung-hsi.yu@...e.com>, Byungchul Park
 <byungchul@...com>, syzkaller@...glegroups.com,
 linux-rt-devel@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Question] Detecting Sleep-in-Atomic Context in PREEMPT_RT via
 RV (Runtime Verification) monitor rtapp:sleep

> RV is not a static checker, it is a run-time checker.
>
> Just in case you are not aware yet, there is also Smatch:
> https://github.com/error27/smatch. But I can't offer much help there.

I was looking up something unrelated, and I found that Smatch does
detect this sleep-in-atomic problem:
https://staticthinking.wordpress.com/2024/05/24/sleeping-in-atomic-warnings/

I'm not sure if its design takes PREEMPT_RT into consideration. But
seems worth having a look.

Nam