linux-kernel - Re: Fwd: domU lenny not working: BUG: unable to handle kernel paging request at e7437cc0

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Date:	Mon, 25 Aug 2008 20:46:41 +0100
From:	Ian Campbell <ijc@...lion.org.uk>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Sally-Anne Edwards <sallyanne.edwards@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Fwd: domU lenny not working: BUG: unable to handle kernel
	paging request at e7437cc0

On Mon, 2008-08-25 at 12:35 -0700, Jeremy Fitzhardinge wrote:
> I haven't see this oops before, but I think the code in question
> correlates to:
> 
> 	bret = RING_GET_RESPONSE(&info->ring, i);
> 	id   = bret->id;
> 	req  = (struct request *)info->shadow[id].request;
> 
> which suggests the backend driver is passing back a bogus request ID.
> 
> What's your host environment?

I believe it's a 64 bit Etch kernel running on a Lenny domain 0. I
wonder if that kernel doesn't write the protocol field in xenstore so
the 64 bit backend Sally-Anne is using cannot talk to the 32 bit
frontend correctly.

Sally, can you run xenstore-ls on the domain's path
(/local/domain/<domid>). Is there a protocol field in the vbd entry?
If not can you try starting the domain in the paused state (xm create
-p) and use xenstore-write to fill in the protocol node in the frontend
to "x86_32-abi". e.g.
        xenstore write /local/domain/<domid>/device/vbd/<nr>/protocol x86_32-abi
before unpausing.

I thought the tools did this (so expected the Lenny tools to be correct)
but looking at the code it seems it is the domain 0 kernel which does
it.

Ian.

-- 
Ian Campbell

Success is getting what you want; happiness is wanting what you get.

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