Similar: my new driver crashes the machine. A couple days debugging. Triple-check every register value. All good. It doesn't crash when I single-step! A couple

Similar: my new driver crashes the machine. A couple days debugging. Triple-check every register value. All good. It doesn't crash when I single-step! A couple more days debugging. Finally get it: the machine crashes when two ports are enabled close enough in time. Go talk to the hardware guys. “Yeah, we know, power traces are fixed in the next rev.”