On Mon, Nov 19, 2012 at 9:39 AM, Colin Guthrie <mageia@colin.guthr.ie> wrote:

The call that's stalling things is stat(), but this never used to be a
problem with lazy umounts in the past (not sure if it's just stat()
that's now blocking at a kernel level or of some userspace code now
calls it when in the past it did not?

If your nfs mount is dead I would expect stat to hang, so I guess it wasn't called in the past.