Waymo engineer hosts AMA on debugging GPU Heisenbugs

A Waymo engineer hosted an AMA about debugging bizarre GPU Heisenbugs, sharing a favorite case where a tmem-to-MMA silicon path intermittently drops high bits, offering a rare look at frontline GPU debugging in autonomous driving.

2026-10-24 ~ 2026-10-24 · 3 related posts

• Engineer Debugs 'Insane GPU Heisenbugs' From Inside a Waymo, Does AMA — sloppenheimer · 2026-10-24
• GPU engineers swap "heisenbug" stories: tmem-to-MMA path randomly drops a high bit — sloppenheimer · 2026-10-24

1 near-duplicate retellings: mike64_t