[Mageia-dev] Please test dracut (mkinitrd replacement)

[Remy CLOUARD]

On Sun, Oct 23, 2011 at 09:05:39PM +0200, Remy CLOUARD wrote:
> On Fri, Oct 21, 2011 at 12:29:46AM +0100, Colin Guthrie wrote:
> > Hi,
> > 
> > Due to upcoming changes to systemd and friends we'll likely need to use
> > dracut rather than mkinitrd for some setups (i.e. those with LVM volumes
> > defined in /etc/fstab)
> > 
> > It would be good if people here could test as we will likely make it the
> > default at some point in the not too distant future.
> > 
> > To test:
> > 
> > sudo -i (or su -)
> > urpmi dracut
> > cd /boot
> > mv initrd-3.1.0-desktop-0.rc10.1.mga2.img initrd-old.img
> > /sbin/installkernel -N 3.1.0-desktop-0.rc10.1.mga2
> done.
> > 
> > 
> > This should install dracut, move the existing initrd out of the way, and
> > regenerate a new one using dracut. If you are using a different kernel
> > version then adjust the two commands accordingly to pick the right version.
> > 
> > Then just reboot. Hopefully all will go well and you won't notice much
> > difference :)
> > 
> I'm sad to be the first to give bad news about that but:
> when I rebooted it didn't work.
> 
> Here is the partitionning scheme I have:
> /boot 256 MB
> raid 0: 2x 60 GB
> LVM on raid
> / on logical volume, btrfs filesystem
> 
> When I boot with the dracut initrd I don't get my / mounted.
> 
> Instead, after a while plymouth disappears and I get the following
> message, repeated all over the screen:
> modprobe: FATAL: Error inserting btrfs
> (/lib/modules/3.1.0-desktop-0.rc10.1.mga2/kernel/fs/btrfs/btrfs.ko.gz)
> Unknown symbol in module, or unknown parameter (see dmesg)
> 
> When I run dmesg|less:
> Everything is fine until my logical volumes are active and then I get
> this message repeated over and over:
> dracut: Checking, if btrfs device complete
> 
> and in the middle of this flood I get this:
> scanning for all btrfs devices
> failed to open /dev/btrfs_control skipping device registration
> scanning devices md0 for LVM volume groups
> Reading all physical volumes. This may take a while
> Found volume group "kaze" using metadata type lvm2
> Partial mode. Incomplete volumes will be processed
> 5 logical volume(s) in volume group "kaze" now active
> Autoassembling MDRaid.
> 
> and in the end I get
> dracut: Warning: no root device "block:/dev/kaze/cauldron" found
> 
> So, to me the problem is neither raid nor LVM but btrfs
> 
> Any idea on how to solve this issue ?
> 
> In case it can be useful, here is the result of
> lsinitrd-dracut /boot/initrd.img : http://pastebin.com/Xe5Jhj38
[...]

I just opened a bug against dracut for this btrfs issue:
https://bugs.mageia.org/show_bug.cgi?id=3214

I still got the problem with the new dracut and kernel.

Regards,
-- 
Rémy CLOUARD
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