RE: [Xen-devel] Help booting Xen under RHEL6 beta2

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Just to close this for posterity:

Move along, these are not the droids you are looking for.

In days of debugging this problem (and also during much help
from Konrad), I had always manually started xenstored before
attempting to start xend.  And every time I had tried xl,
I had tried it after attempting to start xend, and it had
failed.

Apparently starting xend (in 4.0.1-rcX) AFTER starting
xenstored puts xenstored into a very strange state, after
which neither xm nor xl will work (but xenstore-ls and
friends do work).  In this state, all socket connections
fail.  So the classic joke: If it hurts when you do that,
don't do that.

Bottom line: RHEL6b2 distro with 2.6.32.x pvops dom0 with
xen-4.0-testing works.

Thanks to everyone for helping on this!
Dan

> -----Original Message-----
> From: Dan Magenheimer
> Sent: Tuesday, July 13, 2010 5:55 PM
> To: Konrad Wilk; Keir Fraser; Ian Campbell; Stefano Stabellini; xen-
> devel@xxxxxxxxxxxxxxxxxxx; DonDutile; Young
> Subject: RE: [Xen-devel] Help booting Xen under RHEL6 beta2
> 
> Status update: Still no go.
> 
> Konrad and I repeated some of the obvious xenstored related
> possible problems and everything looks fine.
> 
> I tried rolling back the pvops evtchn/gntdev naming changes.
> No difference.  I tried rolling back the tools evtchn changeset
> (21182).  No difference.
> 
> Best I can tell so far, this seems to be something unique
> to RHEL6b2 but don't have the xenstored skills to debug
> any further.
> 
> Dan
> 
> > -----Original Message-----
> > From: Konrad Rzeszutek Wilk
> > Sent: Monday, July 12, 2010 7:30 PM
> > To: Dan Magenheimer
> > Cc: Keir Fraser; Ian Campbell; Stefano Stabellini; xen-
> > devel@xxxxxxxxxxxxxxxxxxx; DonDutile; Young
> > Subject: Re: [Xen-devel] Help booting Xen under RHEL6 beta2
> >
> > On Mon, Jul 12, 2010 at 05:39:34PM -0700, Dan Magenheimer wrote:
> > > > I'm in the process of doing a fresh build which will
> > > > take awhile.
> > >
> > > Backing out to xen-4.0.1-rc3 did not help, though short
> > > of reinstalling the entire system from scratch, I'm not
> > > sure how to ensure I've backed _everything_ out to rc3...
> > > there's too many flying parts.
> >
> > Well, you can try to back-out the two changes in the pv-ops kernel.
> >
> > git revert 376d908f52427591cef4acd172db9c3ef28676ec
> >
> > and
> > git revert 9d85e25edbcb8a684db8470119077475ac4d90b5
> >
> > And that way the pv-ops kernel can run with Xen 4.0 and Xen 4.0-
> > unstable
> > as well.
> >
> > It could also be that you are mixing two versions of Xen. As in you
> > might have the distro's libs and then yours. Perhaps a bit of find /
> > -name libxens*.so could shed some light?
> >

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