Re: [Xen-devel] Xen 4.2.0, xl toolstack cant launch older domUs

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2012-10-03 at 11:42 +0100, Valtteri Kiviniemi wrote:
> Hi,
> 
> I tried to lower vcpus to 1, and now it produces a different crash:
> 
> Unable to handle kernel NULL pointer dereference at virtual address
> 00000024
>  printing eip:
> c0232139
> 005c4000 -> *pde = 00000000:00000000
> Oops: 0000 [#1]
> SMP
> CPU:    0
> EIP:    0061:[<c0232139>]    Not tainted VLI
> EFLAGS: 00010097   (2.6.16.33-xen-domU-oldgame #1)
> EIP is at blkif_int+0x1dc/0x228

I don't suppose you have source / debug info for this kernel to resolve
this into a location?

You say this exact same config works with xend?

If so then, since this appears to relate to the devices, one thing which
might be worth trying is to set on_crash = "preserve" in your config and
run under both xend and xl. You can then collect the content of xenstore
(xenstore-ls -fp) in both cases (xend booted ok, xl preserved in the
crashed state), and compare.

There will be a bunch of differences relating to the xend one finishing
its boot but something might stand out in the diff. Just posting both
sets of output might be useful.

If you run "xl -vvv create" you should also get a bunch of stuff
relating to the domain builder and where it is placing things. Running
under xend I think something similar is dumped under /var/log/xen
(domain-build-ng.log?)

What does your config file look like?

Ian.



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