On Sat, Aug 16, 2025 at 12:34:50AM +0100, Al Viro wrote: > ... as the comments in reparent() clearly say. As it is, we reparent > *all* overmounts of the mounts being taken out, including those that > are taken out themselves. It's not only a potentially massive slowdown > (on a pathological setup we might end up with O(N^2) time for N mounts > being kicked out), it can end up with incorrect ->overmount in the > surviving mounts. > > Fixes: f0d0ba19985d "Rewrite of propagate_umount()" > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> > --- Reviewed-by: Christian Brauner <brauner@xxxxxxxxxx>
