Resolving that bug took quite a bit of serendipity. The break came when I was on the verge of giving up on the assembly rewrite and reverting back to C. I'd left my "frozen" iPod sitting around for a while. ~15 minutes later, I came back, and everything was back to normal -- this was evidence that I was not seeing a true lockup, but rather an extremely long delay (consistent with an integer wraparound).
Resolving that bug took quite a bit of serendipity. The break came when I was on the verge of giving up on the assembly rewrite and reverting back to C. I'd left my "frozen" iPod sitting around for a while. ~15 minutes later, I came back, and everything was back to normal -- this was evidence that I was not seeing a true lockup, but rather an extremely long delay (consistent with an integer wraparound).