[linux-lvm] blkid_wiping breaks snapshots (was: lvm2 2.02.105 breaks snapshots)

Christian Hesse list at eworm.de
Fri Feb 7 23:55:50 UTC 2014

Christian Hesse <list at eworm.de> on Sat, 2014/02/08 00:36:
> Hello everybody,
> I think I nailed it down with git bisect. My first bad commit is:
> 75628f341ad38b68aae33eae0b5700be2a6e5769
> configure: enable blkid_wiping by default if the blkid library is present
> Looks like this wipes data that is still needed... Building a package with
> '--disable-blkid_wipe' now to verify on another system.

Uh, this only helps part of...

I changed my test setup and used writable snapshots. After that I got:

WARNING: DM_snapshot_cow signature detected on /dev/cvg/snap-home at
offset 0. Wipe it? [y/n]

(see https://bbs.archlinux.org/viewtopic.php?id=176504 for another report)

Looks like disabling blkid_wiping fixes this. My snapshot corruption still
occurs though. :-/
Bad thing about it is that the corruption does not occur reliable when doing
simple tests in 'git bisect'... Out of ideas for now - Will go to bed now.
main(a){char*c=/*    Schoene Gruesse                         */"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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