It's the ext3 block reservation patch that's the culprit. (The details are pretty icky) There's been a number of fixes to that in the last few days, so hopefully we'll see resolution on it real soon.
-- Aleksey Nogin
Home Page: http://nogin.org/ E-Mail: nogin cs caltech edu (office), aleksey nogin org (personal) Office: Jorgensen 70, tel: (626) 395-2907