linux-kernel - Re: [PATCH] sched/fair: Fix division-by-zero error in task_scan

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Message-ID: <20250902085745.GT3289052@noisy.programming.kicks-ass.net>
Date: Tue, 2 Sep 2025 10:57:45 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Xia Fukun <xiafukun@...wei.com>
Cc: mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	mgorman@...e.de, riel@...hat.com, dietmar.eggemann@....com,
	rostedt@...dmis.org, bsegall@...gle.com, vschneid@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/fair: Fix division-by-zero error in task_scan_max()

On Wed, Aug 27, 2025 at 12:34:27PM +0000, Xia Fukun wrote:
> The error can be reproduced by following these steps:
> First, set sysctl_numa_balancing_scan_size to 0:
> 
> echo 0 > /sys/kernel/debug/sched/numa_balancing/scan_size_mb
> 
> Then trigger the clone system call, for example, by using
> pthread_create to create a new thread.

How about rejecting 0 instead?