broken mount behaviour on jessie

[Brian May]

Peter Palfrader <weasel at debian.org> writes:

> o) you cannot unmount the tmp0 tree while the tmp1 tree is busy:
>
> } root at valiant:/mnt# (cd tmp1/dev/pts ; sleep 10 &)
> } root at valiant:/mnt# umount /mnt/tmp0/dev/pts
> } umount: /mnt/tmp0/dev/pts: target is busy
> }         (In some cases useful info about processes that
> }          use the device is found by lsof(8) or fuser(1).)

Sounds very much like the reason behind #794828, which has been a
constant problem for me.

Are there any workarounds for Jessie?
-- 
Brian May <bam at debian.org>