HassOS 2.11: File system error

Recently (with HA 0.95.3, 4 and now with 0.96.x) started getting file system errors in HassOs:
EXT4-FS error ext4_mb_generate_buddy:747.

Running HassOS 2.11 in Oracle VM Virtual box. Not sure how to get started with fixing these. Help appreciated.

I have the same error after update to 0.96. Running on Raspberry. Any Idea, or have to reinstall system?