linux-kernel - Re: [PATCH] sched, cgroup: Use exit hook to avoid use-after-free crash

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Message-ID: <1293789859.6839.97.camel@marge.simson.net>
Date:	Fri, 31 Dec 2010 11:04:19 +0100
From:	Mike Galbraith <efault@....de>
To:	Miklos Vajna <vmiklos@...galware.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	shenghui <crosslonelyover@...il.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg KH <greg@...ah.com>, Paul Turner <pjt@...gle.com>,
	Yong Zhang <yong.zhang0@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>
Subject: Re: [PATCH] sched, cgroup: Use exit hook to avoid use-after-free
 crash

On Thu, 2010-12-30 at 00:07 +0100, Miklos Vajna wrote:
> On Wed, Dec 29, 2010 at 04:25:22PM +0100, Ingo Molnar <mingo@...e.hu> wrote:
> > I tried this patch, but it causes a boot crash:
> 
> Hm, indeed. (I get a crash in qemu, but not on the host machine.)
> 
> qemu -enable-kvm -kernel kernel-build/arch/x86/boot/bzImage  -append "root=/dev/sda1 debug sched_debug ignore_loglevel sysrq_always_enabled console=ttyS0 init=/bin/systemd" -hda systemd.img -serial stdio -m 1G -vnc :0
> 
> does not crash here, but
> 
> qemu -enable-kvm -kernel kernel-build/arch/x86/boot/bzImage  -append "root=/dev/sda1 debug sched_debug ignore_loglevel sysrq_always_enabled console=ttyS0" -hda systemd.img -serial stdio -m 1G -vnc :0
> 
> does.
> 
> I'm attaching the config (what I already sent earlier in this thread)
> and the output of the above two commands just in case that helps Peter.

Your crash seems to be completely independent of Peter's patch.  It
crashes here with your image/config/2.6.36 here regardless, and not 100%
repeatably.  Sometimes it boots, sometimes not.

	-Mike


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