This one took a long time to rear up because LDT usage is not very
common, but the bug is quite serious.  It got introduced along with
another bug, already fixed, by 75b8bb3e56ca09a467fbbe5229bc68627f7445be 

Please apply.  Fix should also be headed for stable tree and backported,
it is really sadly trivial.  Glauber, Ingo, sorry for the offlist
posting, somehow the original missed LKML.

Zach