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

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Message-ID: <1293031530.2170.150.camel@laptop>
Date:	Wed, 22 Dec 2010 16:25:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Miklos Vajna <vmiklos@...galware.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, 2010-12-22 at 16:14 +0100, Miklos Vajna wrote:
> 
> 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
> 
> ^ Only init=/bin/systemd added, and this results in a panic in most
> cases. I'm attaching the stdout of qemu, showing the fail in
> put_prev_task_fair. 

OK, that does seem to work, maybe it really wants the vnc thing, dunno.

Anyway, it looks like I need to go build a kernel with kvm in for that
machine ;-) Thanks for the effort so far.
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