CVE-2026-31455

In the Linux kernel, the following vulnerability has been resolved:

xfs: stop reclaim before pushing AIL during unmount

The unmount sequence in xfsunmountflush_inodes() pushed the AIL while background reclaim and inodegc are still running. This is broken independently of any use-after-free issues - background reclaim and inodegc should not be running while the AIL is being pushed during unmount, as inodegc can dirty and insert inodes into the AIL during the flush, and background reclaim can race to abort and free dirty inodes.

Reorder xfsunmountflushinodes() to stop inodegc and cancel background reclaim before pushing the AIL. Stop inodegc before cancelling mreclaimwork because the inodegc worker can re-queue mreclaimwork via xfsinodegcsetreclaimable.