linux-kernel - Re: 2.6.35 hangs on early boot in KVM

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Message-ID: <201008031659.58736.tvrtko.ursulin@sophos.com>
Date:	Tue, 3 Aug 2010 16:59:58 +0100
From:	Tvrtko Ursulin <tvrtko.ursulin@...hos.com>
To:	Avi Kivity <avi@...hat.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: 2.6.35 hangs on early boot in KVM

On Tuesday 03 Aug 2010 16:17:20 Tvrtko Ursulin wrote:
> On Tuesday 03 Aug 2010 15:57:03 Tvrtko Ursulin wrote:
> > On Tuesday 03 Aug 2010 15:51:08 Avi Kivity wrote:
> > >   On 08/03/2010 12:28 PM, Tvrtko Ursulin wrote:
> > > > I have basically built 2.6.35 with make oldconfig from a working
> > > > 2.6.34. Latter works fine in kvm while 2.6.35 hangs very early. I see
> > > > nothing after grub (have early printk and verbose bootup enabled),
> > > > just a blinking VGA cursor and CPU at 100%.
> > >
> > > Please copy kvm@...r.kernel.org on kvm issues.
> > >
> > > > CONFIG_PRINTK_TIME=y
> > >
> > > Try disabling this as a workaround.
> >
> > I am in the middle of a bisect run with five builds left to go, currently
> > I have:
> >
> > bad 537b60d17894b7c19a6060feae40299d7109d6e7
> > good 93c9d7f60c0cb7715890b1f9e159da6f4d1f5a65
>
> Bisect is looking good, narrowed it to ten revisions, but I am not sure to
> make it to the end today:
>
> bad cb41838bbc4403f7270a94b93a9a0d9fc9c2e7ea
> good 41d59102e146a4423a490b8eca68a5860af4fe1c

Bisect points the finger to "x86, ioapic: In mpparse use mp_register_ioapic"
(cf7500c0ea133d66f8449d86392d83f840102632), so I am copying Eric. No idea
whether this commit is solely to blame or it is a combined interaction with
KVM, but I am sure you guys will know.

If you want me to test something else please shout.

Tvrtko

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