linux-kernel - Re: 6.8 to 6.9.0-rc3: kernel NULL pointer dereference in pick_next_task

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Date: Mon, 15 Apr 2024 12:59:07 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Sergei Trofimovich <slyich@...il.com>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	yu.c.chen@...el.com, wuyun.abel@...edance.com
Subject: Re: 6.8 to 6.9.0-rc3: kernel NULL pointer dereference in
 pick_next_task_fair+0x89

On Sun, Apr 14, 2024 at 09:50:18AM +0100, Sergei Trofimovich wrote:
> Hi kernel/sched/ maintainers!
> 
> Over past few days my machines started OOpsing when a nightly kernel
> build starts. I don't have a reliable reproducer. The builder should use
> `idle` CPU scheduling policy.
> 

Thanks for the report, some of us have been chasing this ghost for a
little while and so far it has proven elusive because it's very hard to
reliably reproduce.

I'll go try with your approach.