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

Sat Oct 29 13:03:28 CEST 2011

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
+() ascii ribbon campaign - against html e-mail
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+