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

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Date:	Thu, 30 Dec 2010 00:07:44 +0100
From:	Miklos Vajna <vmiklos@...galware.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>,
	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 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.

View attachment "config.txt" of type "text/plain" (123521 bytes)

View attachment "out-systemd.txt" of type "text/plain" (21968 bytes)

View attachment "out-sysvinit.txt" of type "text/plain" (24996 bytes)

Content of type "application/pgp-signature" skipped