readPidCmdline fell back to '' on darwin (no /proc), so the identity gate
never matched and reapRecordedChromium was inert on the platform #2709's
GPU-spin reap actually targets — it now falls back to ps -o command=.
readPidStartTime no longer throws when ps is missing (Windows): a launch
must never die to a reap-bookkeeping probe. Three stale-state cleanup
paths (dead-daemon stop, startServer stale cleanup, headed-connect) now
reap the recorded chromium BEFORE unlinking the state file instead of
orphaning it, and the stop-path wait polls (100ms steps, 1s cap) instead
of sleeping a fixed 500ms. Wiring pinned: server-state pid/start-time
write, all five cli.ts reap call sites, headless-only GPU-flag push.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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>
