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Re: [linux-lvm] lvm2 2.02.105 breaks snapshots



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.
-- 
main(a){char*c=/*    Best regards,                           */"B?IJj;MEH"
"CX:;",b;for(a/*    Chris           get my mail address:    */=0;b=c[a++];)
putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}

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