[cle-release-team] kernel issues

[Charles Hedrick]

Kernel issues from yesterday:

799: I've added a comment. Probably not critical to do, but I recommend setting rollbackOnReturn in trunk so it is tested for the next release.

797: was resolved by reverting 433. Should be fine as long as no one puts 433 back.

815: we have been running the latest patch in production. I can't prove that the race condition still exists since we upgraded mysql without more work than I current have time to do. It doesn't look like there is an overt deadlock in the code. I think the problem is that subselects cause locks to be generated implicitly, and there's no clear documentation on what locks happen. With Mysql at least, they are version-specific. I'm going to leave the patch in the Rutgers kernel, as I believe it's safer to do the lock. Our problem seemed to have been provoked by Lesson Builder. I modified the LB code to make sure that a lock happens even in an unmodified kernel.