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

[Daniel Stodden <daniel.stodden@xxxxxxxxxx>]

On Thu, 2010-01-21 at 07:28 -0500, Pasi KÃrkkÃinen wrote:
> On Wed, Jan 06, 2010 at 03:50:05PM +0200, Pasi KÃrkkÃinen 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:
> https://bugzilla.redhat.com/show_bug.cgi?id=466681
> 
> Should this be applied to 2.6.18-xen and pv_ops dom0 kernels aswell? 

Only to 2.6.18. 

It's obsolete after 2.6.27.
O_DIRECT gained page cache invalidation in the meantime.

Cheers,
Daniel


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