All,
Well, if you haven't seen it bite you by now, you're lucky but udev changed some things in 168+ that make it vary mad at our kernel. Namely, our kernel does not have the accept4() syscall, and it reall wants that. Myself and Xenoxoas are keenly aware of the issue, and are testing a patched udev today, that we hope will solve everyone's issue.
We will let you know.