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Re: [Xen-devel] Dom0 panic on xen 3.4.3

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Dom0 panic on xen 3.4.3
From: Cris Daniluk <cris.daniluk@xxxxxxxxx>
Date: Sat, 21 Aug 2010 18:27:41 -0400
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On Sat, Aug 21, 2010 at 6:12 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> On Fri, Aug 20, 2010 at 08:20:54PM -0400, Cris Daniluk wrote:
>> On Fri, Aug 20, 2010 at 7:59 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
>> > On Fri, Aug 20, 2010 at 02:15:25PM -0400, Cris Daniluk wrote:
>> >> I'm running Xen 3.4.3 final and observing the following kernel panic
>> >> when I fire up the 9th domU. dom0 is CentOS 5.5 running a XenLinux
>> >> kernel. grub.conf entry is below, followed by the dump. The kernel
>> >> crash is immediately after the 9th domU is unpaused.
>> >>
>> >> title Xen 3.4.3 CentOS (2.6.18-194.11.1.el5xen)
>> >>         root (hd0,0)
>> >>         kernel /xen-3.4.3.gz dom0_mem=768M loglvl=all guest_loglvl=all
>> >> com1=38400
>> >> 0,8n1 console=com1 sync_console noreboot
>> >>         module /vmlinuz-2.6.18-194.11.1.el5xen ro 
>> >> root=/dev/vg_internal/lv_base
>> >> console=hvc0,38400 norhgb netloop.nloopbacks=100
>> >>         module /mpp-2.6.18-194.11.1.el5xen.img
>> >> title CentOS (2.6.18-194.11.1.el5) with MPP
>> >>         root (hd0,0)
>> >>
>> >
>> > so I assume this crash doesn't happen if you use the el5 default xen 
>> > hypervisor?
>> >
>> > Have you tried using latest linux-2.6.18-xen (from xen.org) ?
>> >
>> > -- Pasi
>> >
>> The dom0 kernel is the el5 default, but I have not tried running their
>> hypervisor since it is so dated. I'll give a shot with the latest
>> xen.org kernel.
> Well the version number looks old (3.1.2), but it has a lot of fixes and 
> backports
> from newer xen versions.
> -- Pasi

Having the same issue with the EL5 RPM as well. Latest 2.6.18 on
xen.org seems to be a little broken. The LSI controller isn't getting
detected after the megaraid_sas module loads. The initrds look
identical between the two, so I'm assuming there is some obscure bug
that was fixed and backported into the EL5 kernel but not Jeremy's. I
suppose I can try a newer pvops kernel if you think that might be

Seems to be fairly consistently crashing regardless of Xen version,
though. Also interestingly it seems it may be more about the VMs
starting at once htan the specific number of VMs..


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