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272fa19991Skip exiting and core-dumping tasks when rewriting fs_struct paths in chroot_fs_refs(). Such a task is about to release its fs_struct via exit_fs() anyway, so the worst case is that it lingers on a stale root/pwd until it does. This isn't entirely free: a skipped task keeps its reference on the old root, so after a pivot_root() the old root can't be torn down until the task is gone. With umount2(MNT_DETACH) that only defers destruction of the old rootfs; a plain umount() could in principle fail with -EBUSY. In practice this doesn't matter -- pivot_root(2) is meant to be paired with MNT_DETACH and isn't issued while other tasks are actively using the mount namespace -- so the transient pin is harmless. Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-25-77ee053060e0@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
252 lines
6.1 KiB
252 lines
6.1 KiB