Bug 3214

Summary:	dracut does not generate correct initrd with btrfs
Product:	Mageia	Reporter:	Rémy CLOUARD (shikamaru) <shikamaru>
Component:	RPM Packages	Assignee:	Colin Guthrie <mageia>
Status:	RESOLVED FIXED	QA Contact:
Severity:	major
Priority:	Normal	CC:	Kicer86
Version:	Cauldron	Keywords:	NEEDINFO, Triaged
Target Milestone:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Source RPM:	dracut-013-2.mga2.src.rpm	CVE:
Status comment:
Attachments:	lsinitrd /boot/initrd-3.1.0-desktop-0.rc10.1.mga2.img generated by dracut content of init content of old init ( content of /etc/dracut.conf

Description Rémy CLOUARD (shikamaru) 2011-10-29 10:56:30 CEST

Description of problem:
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

Version-Release number of selected component (if applicable):
dracut: dracut-013-2.mga2
btrfsprogs: btrfs-progs-0.19-1.20111027.1.mga2
kernel: kernel-desktop-3.1.0-0.rc10.1.mga2-1-1.mga2 and kernel-desktop-3.1.0-1.mga2-1-1.mga2

How reproducible:
always

Steps to Reproduce:
1. install a cauldron system (via boot.iso or all.img) with /boot (ext2) and / (btrfs)
2. install dracut
3. move your old initrd: mv /boot/initrd-3.1.0-desktop-1.mga2.img /boot/initrd-old.img
4. run the following command: /sbin/installkernel -N 3.1.0-desktop-1.mga2
5. reboot
6. it fails to mount /, probably because of this /dev/btrfs_control file missing

Comment 1 Rémy CLOUARD (shikamaru) 2011-10-29 10:59:53 CEST

Created attachment 1020 [details]
lsinitrd /boot/initrd-3.1.0-desktop-0.rc10.1.mga2.img generated by dracut

Comment 2 Manuel Hiebel 2011-10-29 11:55:54 CEST

Bug assigned to the package maintainer.

Assignee: bugsquad => mageia

Comment 3 Rémy CLOUARD (shikamaru) 2011-10-29 14:17:17 CEST

Created attachment 1021 [details]
content of init

here is what I have in the init contained in my initrd

Comment 4 Rémy CLOUARD (shikamaru) 2011-10-29 14:20:59 CEST

Created attachment 1022 [details]
content of old init (

Comment 5 Rémy CLOUARD (shikamaru) 2011-10-29 14:25:19 CEST

in case it might be useful, my version/release of udev is 173-3.mga2

Comment 6 Rémy CLOUARD (shikamaru) 2011-10-29 14:27:24 CEST

Created attachment 1023 [details]
content of /etc/dracut.conf

Comment 7 Rémy CLOUARD (shikamaru) 2011-11-04 21:21:52 CET

some additional info, in case it might be interesting.

I tried to load the btrfs module in the dracut shell, by issuing a modprobe btrfs.

Seems like the module canât be loaded, but I also get an error with the zlib_deflate module, though I can load this module individually.

Any idea ?

Comment 8 Colin Guthrie 2011-11-30 23:47:40 CET

I've just updated dracut to latest git master. Can you take it for a spin?

Keywords: (none) => NEEDINFO, Triaged

Comment 9 Colin Guthrie 2011-12-05 19:37:26 CET

I also found a bug that could be related to incorrect root device calculations when the *any* btrfs partitions are found.

Please test the 013-7.mga2 version of the package just submitted and let me know if things behave better now.

Comment 10 MichaÅ Walenciak 2011-12-24 14:46:13 CET

I just tested it and it still occurs (kernel 3.1.4 boots fine, 3.1.6 does not)

CC: (none) => Kicer86

Comment 11 Colin Guthrie 2011-12-24 14:48:25 CET

Can you give some debug output from then it does not boot? You should be dumped to a shell where you can issue various commands and inspect previous command output. One of the commands is failing (presumably one related to fsck in some capacity.

Please give us some info on this!

Comment 12 MichaÅ Walenciak 2011-12-25 17:09:16 CET

it's the same issue as Rémy's:

module btrfs could not be loaded because zlib_deflate cannot be loaded

Comment 13 Colin Guthrie 2011-12-26 23:53:06 CET

OK, so getting somewhere... 

As described here: https://bugs.launchpad.net/ubuntu/+source/linux-linaro-omap/+bug/715835 the problem is the lack of a hard dep on a crc32 implementation (btrfs itself just requires the libcrc32 module). So, it's trivial to fix dracut to ensure that crc32c is included (add it to the instmods line in 90btrfs/module-setup.sh)

However when doing this, it still fails to boot when using a root=UUID=nnn syntax. I think dracut is someone extracting certain things from either blkid or udev incorrectly.

If you use root=/dev/sda1 etc. it'll work fine.

Anyway I'll try and work on a full fix shortly.

Colin Guthrie 2011-12-26 23:53:16 CET

Status: NEW => ASSIGNED

Comment 14 Colin Guthrie 2011-12-27 00:06:30 CET

Hmm, actually it's the resume= bit that seems to break things (which I think is covered in another bug (or at least it was on my mental list), and deleting the resume= bits from the kernel command line allows it to boot fine even with a UUID= type syntax. Job's a good 'un.

Status: ASSIGNED => RESOLVED
Resolution: (none) => FIXED

Comment 15 MichaÅ Walenciak 2011-12-27 14:25:15 CET

works indeed, thx