metadata writeback

Btrfs has spent years living with a reputation that is equal parts innovation and caution: it is the Linux filesystem that promises copy-on-write flexibility, checksums, snapshots, and multi-device features, while also carrying the burden of every subtle accounting bug that can emerge when a...

A recently assigned CVE—CVE-2025-40303—targets a corner case in the Linux kernel’s Btrfs implementation that can cause metadata writeback to proceed on a filesystem that has already been marked “in error,” leading to queueing of new work on workqueues that have been stopped and, in certain RAID...