Re: [Xen-users] Kernel panics

[Yves Dorfsman <yves@xxxxxxxxx>]

On Thu, 5 Jul 2007, Martin Goldstone wrote:

> > "Please append a correct "root=" boot option"
> > "Not syncying VFS unable to mount root fs on unknown-block(2,0)"
> > (sort of, I'm catching this just before it reboots !).
> I'm assuming you've already got a root= entry, but I've noticed
> sometimes that what works as the root= under a regular kernel doesn't
I have used the same as for my regular kernel:
boot=/dev/sda1


> under Xen (I've noticed this mainly on RHEL systems, they have a
> tendency to use root=LABEL=/, and under certain Xen kernels (though not
> on the 2.6.18 that comes with the Xen 3.1 binary) I've had to point it
> to the correct device (though to be fair, it could have been my initrd).
> > Do you HAVE to have an initrd, or if you managed to put all the
> > necessary drivers in the kernel, you should be able to boot without an
> > initrd ?
> As long as you have all the driver's needed to boot the kernel, you
> should be fine without an initrd
Thanks, that's what I thought, so I'll stop wasting my time with initrd 
for now, and concentrate on the kernel panic itself.

> > My root partition is formated with JFS. Can this be an issue, or as long
> > as I have the JFS drivers in the kernel I should be fine ?
> Again, as long as you have you have either the driver in the kernel or
> the module in the initrd, this should be fine.  I've not come across any
Thanks, that's what I through.


> > Or a way to make it stop and wait for a key to be pressed before it
> > reboots ?
> I add noreboot to the end of the dom0 kernel's module line in grub (not
> the kernel line, as that's Xen, but usually the line below it.
Thanks.

> > When I do use an initrd, I get a segfault from the linuxrc.
> > Depending what version of mkinitrd I use I get different results, a lot
> > of the time I can't even mount the gunzip resulting file, and when I can
> > mount it, I get a lot of empty directories.... Is there a better way of
> > producing the initrd ?
> I always use mkinitrd, and I've not had a problem like this before.
> What distro are you using?
Gentoo.

> Do you put anything weird in your initrd?
I let mkinitrd do its stuff. What do you mean by that ?

> Are you using the stock binaries from the Xen site, or are you rolling
> your own?
For xen.gz, I 've tried both.
For the kernel, I had to build my own, as there is no driver nor module in 
the "dist" one.
> Is mkinitrd returning any errors?
Nop....




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