In Linux kernel 6.7, a serious error has been found in the logic of the Bcachefs file system, which manifests in configurations with multiple storage devices when using new versions of the file system creation tools. The problem arises from the possibility of creating a situation where the file system tries to update its version, which may not complete; after this, the kernel might attempt to downgrade the file system version — and as a result of this interaction, severe file system corruption can occur.
Currently, all Bcachefs users with more than one device are advised to upgrade to kernel 6.8 because the proposed fixes have not been accepted into the 6.7 branch due to non-compliance with the requirements of the accompanying issues (fixes for various problems were submitted in one pull request without separation into individual patches). Over time, a file system rescan mechanism will be implemented to reconstruct trees from inode metadata, ensuring recovery even in such situations.
Bron: opennet.ru
