Quota not working when cleaning up snapper snapshots

Hi to all,

I don’t know exactly if this issue goes in this forum so here it goes.

I’ve been using snapper for the last year without any problem, sometimes I had to do some cleaning up because snapshots were eating up my root partition. I usually remove snapshots typing:

# snapper rm snapshotX-snapshotY
# snapper cleanup number

Until now, everything worked fine but last night I had a weird message when executing the second command:

# snapper cleanup number
quota not working (preparing quota failed)

Seems that algorythms empty-pre-post and timeline work without flaws.

I’ve been googling around with no luck. Anyone knows what’s happening?

My snapper log looks like this.

2017-05-28 11:56:21 MIL libsnapper(8193) AsciiFile.cc(reload):114 - loading file /etc/snapper/configs/root
2017-05-28 11:56:21 MIL libsnapper(8193) AsciiFile.cc(getValue):235 - key:SUBVOLUME value:/
2017-05-28 11:56:21 MIL libsnapper(8193) AsciiFile.cc(getValue):235 - key:FSTYPE value:btrfs
2017-05-28 11:56:21 MIL libsnapper(8193) AsciiFile.cc(getValue):235 - key:QGROUP value:1/0
2017-05-28 11:56:21 MIL libsnapper(8193) AsciiFile.cc(getValue):235 - key:SYNC_ACL value:no
2017-05-28 11:56:21 MIL libsnapper(8193) Snapper.cc(Snapper):125 - subvolume:/ filesystem:btrfs
2017-05-28 11:56:21 MIL libsnapper(8193) Snapper.cc(loadIgnorePatterns):174 - number of ignore patterns:8
2017-05-28 11:56:21 MIL libsnapper(8193) Snapshot.cc(read):245 - found 4 snapshots
2017-05-28 11:56:51 MIL libsnapper(8193) Snapper.cc(~Snapper):136 - Snapper destructor
2017-05-28 11:57:21 MIL libsnapper(8193) snapperd.cc(main):287 - Exiting

Thanks in advance for your help.