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Re: [Xen-devel] Tagging Xen 4.0.0 first release candidate / pygrub dom0

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Tagging Xen 4.0.0 first release candidate / pygrub dom0 caching bug
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Thu, 21 Jan 2010 14:28:50 +0200
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On Wed, Jan 06, 2010 at 03:50:05PM +0200, Pasi Kärkkäinen wrote:
> On Tue, Jan 05, 2010 at 06:42:05AM +0000, Keir Fraser wrote:
> > I plan to tag -rc1 later this week. If you have any outstanding patches,
> > please send them to the list now.
> > 
> Hmm.. I just remembered this pygrub bug:
> https://bugzilla.redhat.com/show_bug.cgi?id=466681
> pygrub doesn't use O_DIRECT so sometimes it gets old information
> from dom0 kernel cache - and fails to use the updated domU grub.conf.
> Redhat seems to have patches available for testing.. not for
> xen-unstable though.
> I've personally hit this bug many times.

It seems Redhat guys have a fix available.. they fixed the problem by 
patching dom0 kernel blkback.

More details about the fix here:

Should this be applied to 2.6.18-xen and pv_ops dom0 kernels aswell? 

-- Pasi

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