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Garry TanandClaude Fable 5
78cd06e157
Two defects in one report. On macOS 26 / Apple Silicon the headless-shell GPU process pegs ~800% CPU indefinitely after real page work and --disable-gpu alone is not enough; the reporter validated that adding --disable-software-rasterizer/--disable-gpu-compositing/--disable-gpu-watchdog drops it to 0.0% with screenshots still working. The flag block is a pure platform-parameterized function (unit-tested on any host), darwin-gated, headless-only (buildGStackLaunchArgs feeds the headed/GBrowser paths where GPU-off is wrong), with a GSTACK_DISABLE_GPU=off escape. Separately: the headless launch has no userDataDir, so it never writes the SingletonLock that killOrphanChromium walks — 'browse stop' reported success while the orphan kept spinning. The daemon now records the launched child's pid + wall-clock start time in the state file (the xvfbPid/xvfbStartTime contract), and stop paths reap a survivor only after verifying BOTH the recorded start time and a Chromium-looking cmdline — a recycled PID, even one running a different legitimate Chromium, is never killed (identity tests include the coreutils-shebang trap that defeats argv0 renames). macOS efficacy is per the reporter's validation; live re-verification on Apple silicon is tracked in TODOS.md. Refs #2709 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>