Bug#1032482: LXD - issue with btrfs backend loop file

2023-03-07 Thread Mathias Gibbens 
Control: tags -1 + confirmed pending

Hi Sylvain,

  Thanks for reporting this issue and the sleuthing to find the
upstream fix. Shortly I'll be uploading a new version of lxd to
unstable with that commit cherry-picked back into Debian's packaging.

Mathias


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Bug#1032482:

2023-03-07 Thread Sylvain Tgz 
I found a related issue on upstream git.
https://github.com/lxc/lxd/pull/11333
Following date of 5.0.2 and issue creation. This fix is not present on 5.0.2.

Bug#1032482: LXD - issue with btrfs backend loop file

2023-03-07 Thread Sylvain Tgz 
Package: lxd
Severity: important

Hello,

I had an issue when using a btrfs backend loop file.
To confirm the issue, I bootstrapped a fresh Deb12 install. This is
the method to reproduce the issue.

After installed lxd,btrfs-progs and done the init wizard :

lxc storage create pool_btrfs_1 btrfs size=50GiB
lxc profile device add default root disk path=/ pool=pool_btrfs_1
lxc profile device add default ethlan nic name=ethlan nictype=bridged
parent=brlan
lxc init images:debian/12 Deb12test -v

All seems to be fine, trying to limit storage for this container

lxc config device override Deb12test root size=20GiB
Error: Failed to update device "root": Failed to run: btrfs qgroup
create 0/257 /var/lib/lxd/storage-pools/pool_btrfs_1/containers/Deb12test:
exit status 1 (ERROR: unable to create quota group: File exists)

I've the issue
Try to create a new container

lxc init images:debian/12 Deb12test2 -v
Creating Deb12test2
Error: Failed instance creation: Failed creating instance from image:
Failed to run: btrfs qgroup create 0/256
/var/lib/lxd/storage-pools/pool_btrfs_1/images/3971d4f65afc45437f1a688151487848e966088de60e995d9a6e638e292bae71:
exit status 1 (ERROR: unable to create quota group: File exists)

Issue again, no more action possible :(

After some previous tests I discovered this issue is related to btrfs 6.
Downgrade it :

wget 
http://snapshot.debian.org/archive/debian/20220922T121957Z/pool/main/b/btrfs-progs/btrfs-progs_5.19.1-1_amd64.deb
dpkg -i btrfs-progs_5.19.1-1_amd64.deb

(no reboot performed)

lxc init images:debian/12 Deb12test2 -v
Creating Deb12test2
lxc config device override Deb12test root size=20GiB
Device root overridden for Deb12test

All works fine !

I found this issue on LXD tracker https://github.com/lxc/lxd/issues/11210
Therefore, changelog of 5.0.2 seems have the fix :
https://linuxcontainers.org/lxd/news/#lxd-502-lts-has-been-released
"lxd/storage/drivers/driver/btrfs/utils: Fix getQGroup to suport BTRFS >= 6.0.1"

I will also try to inform upstream devs. I will keep you if I have
news from them.

Sylvain