linux-kernel - Re: [PATCH EEVDF NULL deref] sched/eevdf: Fix NULL deref when avg

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Message-ID: <20251105123954.GM3245006@noisy.programming.kicks-ass.net>
Date: Wed, 5 Nov 2025 13:39:54 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Zicheng Qu <quzicheng@...wei.com>
Cc: mingo@...hat.com, juri.lelli@...hat.com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com,
	mgorman@...e.de, vschneid@...hat.com, linux-kernel@...r.kernel.org,
	wulibin163@....com, tanghui20@...wei.com, zhangqiao22@...wei.com,
	judy.chenhui@...wei.com
Subject: Re: [PATCH EEVDF NULL deref] sched/eevdf: Fix NULL deref when
 avg_vruntime nears overflow

On Wed, Nov 05, 2025 at 06:47:40PM +0800, Zicheng Qu wrote:
> This is the reproduction patch. We encountered a similar issue on a
> normally running kernel, and after analysis, we deliberately constructed
> a comparable scenario. Since it is difficult to control the conditions
> from user space, we proactively modified certain parts of the kernel
> code to simulate the issue (the code includes detailed explanations).

Thanks!

> As for the zero_vruntime patch, after applying it, we have not
> observed any crashes over than 24 hours.

Excellent, I'll go think about the SCHED_CORE case and make it a proper
patch then.