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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.”

I feel like "I can reliably make the bug disappear by turning on my debug harness" is a reliable sign that things are about to get weird.

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