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

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Message-ID: <20240416162319.GG30852@noisy.programming.kicks-ass.net>
Date: Tue, 16 Apr 2024 18:23:19 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Igor Raits <igor@...ddata.com>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	slyich@...il.com, wuyun.abel@...edance.com, yu.c.chen@...el.com
Subject: Re: 6.8 to 6.9.0-rc3: kernel NULL pointer dereference in
 pick_next_task_fair+0x89

On Tue, Apr 16, 2024 at 08:18:28AM +0200, Igor Raits wrote:
> Hello all,
> 
> We also see this issue quite frequently these days, however it gets
> slightly hidden behind printk issue so that full stacktrace can't be
> printed due to the deadlock.

Who is we and how do you make it go bang?

Having a semi reliable reproducer in hand would be a tremendous help.


Anywya, I've had:

schedtool -D -e bash -c "while :; make O=defconfig-build clean; make O=defconfig-build -j64; done"

running for an hour or so now, but no luck :/