Comment 7 for bug 668799

@Peter, that patch, against 0.13 results in some odd deadlocks; specifically a racey deadlock during signal handling best I can tell.

Attached is an strac'ing of the make process- nothing special, just forking off some children, wait'ing on the results- if you look earlier in the log you'll see the fork/wait working fine (look for SIGCHLD delivery), then see the final one go out to lunch waiting on a futex.

At this point it takes me about 4-5 runs to trigger it, but it's proving fairly reproducible on the builds I've been attempting- cmake in particular seems to trigger it rather quickly.