linux-kernel - crash with CFS v4 and qemu/kvm (was: [patch] CFS scheduler, v4)

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Message-Id: <200704231128.23594.mail@earthworm.de>
Date:	Mon, 23 Apr 2007 11:28:18 +0200
From:	Christian Hesse <mail@...thworm.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>,
	kvm-devel@...ts.sourceforge.net, Avi Kivity <avi@...ranet.com>
Subject: crash with CFS v4 and qemu/kvm (was: [patch] CFS scheduler, v4)

On Friday 20 April 2007, Ingo Molnar wrote:
> i'm pleased to announce release -v4 of the CFS patchset.

Hi Ingo, hi Avi, hi all,

I'm trying to use kvm-20 with cfs v4 and get a crash:

eworm@...o:~$ /usr/local/kvm/bin/qemu -snapshot /mnt/data/virtual/qemu/winxp.img
kvm_run: failed entry, reason 7
kvm_run returned -8

It works (though it is a bit slow) if I start qemu with strace, so for me it 
looks like a race condition?

I did not test any earlier versions of cfs and kvm in combination - I can't 
say if it happens there as well.
-- 
Regards,
Chris

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