Comment 28 for bug 1423672

Seems we are also confronted with this error in one of our VMWare guests:
[45780.021968] EXT4-fs error (device dm-9): ext4_mb_generate_buddy:756: group 1411, block bitmap and bg descriptor inconsistent: 32757 vs 32768 free clusters
[45780.022029] Aborting journal on device dm-9-8.
[45780.055657] EXT4-fs (dm-9): Remounting filesystem read-only
[45780.055733] EXT4-fs error (device dm-9) in ext4_orphan_add:2609: Journal has aborted

It happened four times the last three weeks, pretty annoying. We have tried to "harden" ext4 in some way by using:
* ext4 rw,relatime,nodelalloc,errors=remount-ro,commit=2
as mount options. We have also increased hung_task_timeout_secs as we have found some hints in a RedHat KB article.

Any ideas on how to fix that ext4 error in the guest?