linux-kernel - Re: [PATCH] avoid race condition in pick_next_task_fair in kernel/sched

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Message-ID: <20101222133154.GS10557@genesis.frugalware.org>
Date:	Wed, 22 Dec 2010 14:31:55 +0100
From:	Miklos Vajna <vmiklos@...galware.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>,
	shenghui <crosslonelyover@...il.com>,
	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] avoid race condition in pick_next_task_fair in
 kernel/sched_fair.c

On Wed, Dec 22, 2010 at 10:07:22AM +0100, Peter Zijlstra <peterz@...radead.org> wrote:
> On Wed, 2010-12-22 at 09:41 +0100, Mike Galbraith wrote:
> > On Wed, 2010-12-22 at 09:29 +0100, Peter Zijlstra wrote:
> > > On Wed, 2010-12-22 at 01:22 +0100, Miklos Vajna wrote:
> > > > Please let me know if you need more info.
> > > 
> > > What distro are you using? it looks like systemd is involved and I'm
> > > actively avoiding anything using that crap.

First, sorry about the systemd list, I did not know it's
subscriber-only.

This is Frugalware Linux, and it's disabled by default here as well.

> > Heh, gearing up to hunt a bug it triggers, just doing all I had to do to
> > get the thing built and installed blew my box _all up_.  I still have
> > smoldering bits lying about a week later.
> 
> There's a reason I was asking for a qemu image ;-), I'm not letting that
> stuff anywhere near my regular machines.

Sure - here is a qcow image (871M):

http://frugalware.org/~vmiklos/files/systemd.img

Here is how I started it:

qemu-kvm -vnc :0 -m 1G -hda systemd.img

$ qemu-kvm -version
QEMU PC emulator version 0.12.3 (qemu-kvm-0.12.3), Copyright (c) 2003-2008 Fabrice Bellard

There are two menu entries in grub config - first is sysvinit, that
boots up correctly here, you can login using root / root. The second is
systemd, that just panics here almost all the time. In case it would
not, use 'systemctl emergency' as root and that will trigger the bug. :)

If you need more packages in the virtual machine and the pacman package
manager sounds exotic, here is a quick help:

http://frugalware.org/docs/pacman-g2#_apt_pacman_g2_cross_reference

Thanks,

Miklos

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