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Re: [Xen-devel] Working hotplug, but still timing out waiting for vbd de

To: Charles Duffy <cduffy@xxxxxxxxxxx>
Subject: Re: [Xen-devel] Working hotplug, but still timing out waiting for vbd device ("changing physical-device not supported"?)
From: Ewan Mellor <ewan@xxxxxxxxxxxxx>
Date: Mon, 14 Nov 2005 12:27:56 +0000
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On Mon, Nov 14, 2005 at 06:10:39AM -0600, Charles Duffy wrote:

> Ewan Mellor wrote:
> >On Sun, Nov 13, 2005 at 11:37:06AM -0600, Charles Duffy wrote:
> >
> >>changing physical-device not supported
> >
> >Actually Charles, I've just noticed this in your earlier mail, and this
> >suggests something a little more serious going on than I first thought
> >(actually you might have two problems, so if you could still address the
> >potential race, that would be good).
> 
> Yes; I'll get you feedback on the other item within the next few hours.
> 
> >Does this happen immediately after a reboot?
> 
> Let's see... I have it happening on the first DomU startups after one 
> boot... and don't see it anywhere else in my logs, particularly 
> including my more recent test boots.

Hmm.  There's a possibility that stale state in the store would cause this.
It's convoluted, but I think it's possible.  If you see it again, then

xenstore-rm /local
xenstore-rm /vm
reboot

would be a good idea (assuming that this is a test box and you don't care
about what's on it!).  If it's gone away, then let's focus on the hotplug
script problem.

There is a patch coming through soon that should help with the "changing
physical-device" problem, assuming that it _is_ stale state that's causing it.

Cheers,

Ewan.

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