Christian Hesse <list@eworm.de> on Thu, 2014/01/23 14:27:
> Hello everybody,
>
> looks like lvm2 2.02.105 breaks snapshots. This is my block device tree:
>
> NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
> sda 8:0 0 477G 0 disk
> |-sda1 8:1 0 767M 0 part
> | `-vg0-boot 254:0 0 64M 0 lvm /boot
> |-sda2 8:2 0 444,2G 0 part
> | `-cvg 254:3 0 444,2G 0 crypt
> | |-cvg-root 254:4 0 40G 0 lvm /
> | |-cvg-swap 254:5 0 4G 0 lvm [SWAP]
> | |-cvg-log 254:6 0 1G 0 lvm /var/log
> | `-cvg-home 254:8 0 320G 0 lvm /home
> |-sda3 8:3 0 32G 0 part
> `-sda128 259:0 0 1M 0 part
>
> Creating a snapshot succeeds, but it is broken and can not be mounted:
>
> # lvcreate -s -pr -l50%free -n snap-home cvg/home
> Logical volume "snap-home" created
> # mount /dev/cvg/snap-home /mnt/tmp
> mount: /dev/mapper/cvg-snap--home is write-protected, mounting read-only
> mount: wrong fs type, bad option, bad superblock on
> /dev/mapper/cvg-snap--home, missing codepage or helper program, or other
> error
>
> Syslog has a lot of these messages:
>
> [ 4823.002220] EXT4-fs (dm-7): ext4_check_descriptors: Checksum for group
> 256 failed (43470!=57954)
>
> Downgrading to lvm2 2.02.104 fixes the problem:
>
> # lvcreate -s -pr -l50%free -n snap-home
> cvg/home Logical volume "snap-home" created
> # mount /dev/cvg/snap-home /mnt/tmp
> mount: /dev/mapper/cvg-snap--home is write-protected, mounting read-only
>
> This is an Arch Linux system with Linux 3.12.8.
Hello everybody,
did anybody notice my mail? This is a real regression for me and I would like
to get this sorted. I will help with whatever is needed to find the problem.
--
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putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);}
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