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Re: [Xen-users] Kernel panics

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Yves Dorfsman <yves@xxxxxxxxx>
  • Date: Thu, 05 Jul 2007 11:34:29 -0600 (MDT)
  • Delivery-date: Thu, 05 Jul 2007 10:33:55 -0700
  • Importance: Normal
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

> OK, I may be going off on a tangent here, but bear with me.
> This may sound like a silly question, but when you roll your own kernel,
>  are you building it along with Xen, or are you building it manually?
> I've not built a Xen-patched kernel manually before, so I'm a little
> unfamiliar with the process, but there are patches to apply (if you are
> using vanilla sources), and then there are specific settings when
> configuring. The kernel config file that is in the source tarball from
> the Xen site should tell you what you need to know.

Actually I even tried to use my "normal" 2.6.20 kernel, and XEN told me
this wasn't a XEN kernel and it couldn't use it.

But to answer your question, I got the tar ball, and ran "make world"
which pulled the kernel sources from the internet, and added the XEN
specific to it. Knowing I needed to add the JFS driver in there, I
ran "make oldconfig" "make menuconfig" and added all the drivers into
that I thought I neede, then ran a "make" again.

Since then, I've re-started this from scratch, and I am now making
"make world" to split dom0 from domU which cuts down the compile time
by a fair bit, but hasn't changed the results by one bit !

> - From what you've said though, I'm guessing that there's a driver you
> need that is only in a later kernel.  If that's the case, you may need

Hmmmm... I thought about that for about 5 seconds, I do have a fairly
recent AM2 mother board, and my current kernel is 2.6.20.

I'll pull the 2.6.16 from kernel.org, and see if I can boot from that.

> to either port the Xen patches to it yourself (apparently not a task for
> the faint hearted), or hope someone else has done so (for instance, the
> latest Ubuntu has a different kernel version to the one on the Xen
> site).  Or you could back port the driver you need.  That's of course if
> you need a kernel newer than 2.6.18.  If you don't, have you tried Xen
> 3.1?

I did quickly tried XEN 3.1, but got the same results...

> Of course, I may have got this all wrong.  So if you're using the
> standard patched sources, and the kernel is configured correctly, my
> apologies for asking such time wasting questions :-)

Don't worry, I appreciate your help, makes me re-think all the steps
I have done, so that might even trigger good ideas (the old "ask Bob"

> At any rate, have you managed to capture any useful information from the
> panic yet?

What is "useful" information, beyond the message I posted in an earlier
post ? And how can I get the output to be more verbose than that ?


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