linux-kernel - Re: [kvm-devel] [BUG] Oops with KVM-27

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Date:	Sun, 10 Jun 2007 22:54:02 +0200
From:	Luca <kronos.it@...il.com>
To:	"Avi Kivity" <avi@...ranet.com>
Cc:	kvm-devel@...ts.sf.net, linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [BUG] Oops with KVM-27

On 6/10/07, Avi Kivity <avi@...ranet.com> wrote:
> Luca wrote:
> > On 6/5/07, Avi Kivity <avi@...ranet.com> wrote:
> >> Luca Tettamanti wrote:
> >> > Il Mon, Jun 04, 2007 at 11:51:10PM +0300, Avi Kivity ha scritto:
> >> >
> >> >>> While doing repeated tests with the installer I ran into another
> >> >>> (unrelated) problem. Sometimes the guest kernel hangs at boot at:
> >> >>>
> >> >>> NET: Registered protocol family 2
> >> >>>
> >> >>> with any kind of networking options (except for -net none, which
> >> works).
> >> >>> With -no-kvm it boots with any networking option.
> >> >>>
> >> >>>
> >> >>>
> >> >> Can you try to pin the guest on a single core with taskset:
> >> >>
> >> >>    taskset 1 qemu ...
> >> >>
> >> >
> >> > Doesn't help. What works is 'nolapic', i.e. disabling the local
> >> APIC on
> >> > the guest kernel.
> >> > I've also tried disabling TSC (notsc) and forcing PIT as the
> >> clocksource
> >> > (clocksouce=pit clock=pit); neither of them helped.
> >> >
> >> >
> >>
> >> Is this a regression relative to a previous kvm version?
> >
> > Hello,
> > sorry for the delay, I was having troubles compiling older KVMs with a
> > recent kernel...
> > The last version that works is kvm-21; starting from kvm-22 the VM
> > hangs during network initialization (now always, but pretty often).
> > This only occurs when the guest is Fedora7 setup ISO. The regular boot
> > (i.e. from the hd) seems unaffected.
>
> I've managed to reproduce this on kvm-21 (it takes many boots for this
> to happen, but it does eventually).

Hum, any clue on the cause? Should I test older versions?

Luca
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