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Re: [Xen-users] Kernel panics and blank /var/log/messages?

To: Muli Ben-Yehuda <muli@xxxxxxxxxx>
Subject: Re: [Xen-users] Kernel panics and blank /var/log/messages?
From: Yoav Felberbaum <mailinglists@xxxxxxxxxx>
Date: Tue, 24 Oct 2006 16:28:26 +0100
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On 24 Oct 2006, at 16:19, Muli Ben-Yehuda wrote:

On Tue, Oct 24, 2006 at 02:14:54PM +0100, Yoav Felberbaum wrote:
Hello,

My Xen-ified kernel (3.0.3) on a dedicated host seems to be kernel-
panicing upon boot. Since IPMI/SOL seems to be nonfunctional in the
Xen kernel, I cannot tell what is causing the kernel to panic.

SOL works (for SOL definitions of works...) fine for me on an IBM
x366. What are your Xen and Linux command line options? do you have
SOL working with a stock Linux kernel?

Yes - it works on a default RHEL kernel. I've tried several times to fix it to no luck...
---
default 4
timeout=10
#splashimage=(hd0,0)/grub/splash.xpm.gz
#hiddenmenu
serial --unit=1 --speed=19200 --word=8 --parity=no --stop=1
terminal --timeout=10 console serial
<SNIP>
title Red Hat Enterprise Linux ES (2.6.9-42.0.3.ELsmp)
        root (hd0,0)
kernel /vmlinuz-2.6.9-42.0.3.ELsmp ro root=LABEL=/ console=tty0 console=ttyS1,19200n8
        initrd /initrd-2.6.9-42.0.3.ELsmp.img
<SNIP>
title Xen 3.0 / XenLinux 2.6
        root (hd0,0)
        kernel /xen-3.0.gz dom0_mem=192M
module /vmlinuz-2.6.16-xen ro root=LABEL=/ console=tty0 console=ttyS1,19200n8
        module /initrd-2.6.16.29-xen.img
----

So I thought I'd check /var/log/messages. But to my surprise, that
also seems to have no output for any messages generated by the Xen
kernel. Why? (The default RHEL4.4 kernels seems to log to this file
just fine, and I've checked syslog.conf which looks fine).

If you panic before mounting the root file system, there's no file
system to write the log output to.

D'oh, good point. *Sighs* Guess I'm up a creek without a paddle.

Y.

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