nilfs_cpfile_delete_checkpoints: cannot delete block

Hi,

Until now nilfs-2.0.12 has run very stable without data corruption.
However on one partition (600G) I have got the following errors while 
running the cleaner:

nilfs_cpfile_delete_checkpoints: cannot delete block
NILFS: GC failed during preparation: cannot delete checkpoints: err=-2

This is a partition mainly holding large temporary render files (can be 
up to 25gb/file). There are currently 132702 snapshots.

As this partition is not used during the next few days, I will leave it 
with the error so if you would like me to test further things, please 
let me know.

Bye,
David Arendt