[Xen-devel] Re: Test results for save/restore with upstream pv_ops domU kernels, 2.6.33 problems

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2010-02-25 at 15:14 +0000, Pasi Kärkkäinen wrote:
> On Fri, Jan 29, 2010 at 10:35:32AM +0000, Ian Campbell wrote:
> > On Thu, 2010-01-28 at 21:25 +0000, Pasi Kärkkäinen wrote:
> > > Hello,
> > > 
> > > I just tried some save/restore tests with Fedora 12 Linux 2.6.31.12 
> > > kernels.
> > > The exact Fedora kernel versions are: 2.6.31.12-174.2.3.fc12.i686.PAE and 
> > > 2.6.31.12-174.2.3.fc12.x86_64.
> > > 
> > > Dom0 for these tests was CentOS 5.4 (Xen 3.1.2).
> > > 
> > > - F12 32bit 1vcpu PV guest: 
> > >   save+restore OK, BUG() in guest dmesg after restore [1]
> > > 
> > > - F12 64bit 1vcpu PV guest:
> > >   save+restore OK, BUG() in guest dmesg after restore [2]
> > 
> > I think those are the same underlying bug and are fixed by 
> > http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=commit;h=777df2b017ef34b2d1a172bf769582158839a860
> > 
> > > 
> > > - F12 32bit 2vcpu PV guest:
> > >   save doesn't work, guest stays as "migrating-f12test32" in "xm list" 
> > > forever and has to be "xm destroy"ed.
> > > 
> > > - F12 64bit 2vcpu PV guest:
> > >   save doesn't work, guest stays as "migrating-f12test64" in "xm list" 
> > > forever and has to be "xm destroy"ed.
> > > 
> > > 
> > > What's the best way to debug failing "xm save" ? There was no errors in 
> > > "xm log", or in "xm dmesg".
> > 
> > I think you might see some stuff in /var/log/xen/something but I don't
> > have any particular tips apart from "add printf/printk".
> > 
> > > Also the guest "xm console" doesn't show anything before it dies.
> > > 
> > > Is it possible some of the save/restore related patches didn't make it to 
> > > 2.6.31.x stable kernels? 
> > 
> > AFAIK they only went into the 2.6.32 stable branch. Unfortunately I
> > think the 2.6.31 stable series has come to an end now.
> > 
> 
> Hello,
> 
> An user on ##xen just reported that 2.6.32.9 save/restore works OK,
> but 2.6.33 fails/crashes.
> 
> Some of the patches that went to 2.6.32.x are not in 2.6.33?

I don't think so -- the acceptance criteria for a stable tree is that
the patch is in mainline already. Must be some new breakage.

Ian.

> 
> -- Pasi
> 



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