sys_unshare() does mmput(new_mm). This is not enough if we have
mm->core_waiters.
This patch is a temporary fix for soon to be released 2.6.16.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
[ Checked with Uli: "I'm not planning to use unshare(CLONE_VM). It's
not needed for any functionality planned so far. What we (as in Red
Hat) need unshare() for now is the filesystem side." ]
Signed-off-by: Linus Torvalds <torvalds@osdl.org>