amtadt

Because CRC is in the on-disk data structure, not in the in-ram data structure. It is stripped upon reading to ram, and created upon writing to disk.

That's how bcachefs is designed right now.

Self healing is dangerous because it can potentially corrupt good data on disk, if RAM or other system component is flaky.

Repro: supposedly only good copy is copied to ram, ram corrupts bit, crc is recalculated using corrupted but, corrupted copy is written back to disk(s).