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In-process diagnostics (diagnostics.ts heartbeat at 5 Hz + node-report snapshots on every beforeEach and heartbeat tick) merged in #7838 and #7842 reach a hard ceiling: during every captured death window the V8 main isolate is event-loop-starved for 200-400 ms before the process is externally terminated, so any timer-driven probe (heartbeat, setTimeout, --report-on-signal handler) never gets serviced and we have zero JS-visible state from the actual moment of death. To capture state during the starvation window we need a probe whose own scheduling does not depend on the dying process's libuv event loop. This commit adds a tiny bash background loop to the Windows backend-test steps (both with- and without-plugins). Every 500 ms it appends: - netstat.log: localhost TCP socket state — surfaces TIME_WAIT / CLOSE_WAIT accumulation or ephemeral-port exhaustion that the in-process libuv handle list can't see (libuv only shows handles Node currently knows about; the kernel may hold many more sockets in disposal states). - tasklist.log: node.exe process state from the Windows OS view (handle count, working set, CPU time), independent of whether V8 is responsive. Both files land in $GITHUB_WORKSPACE/node-report/ which is already the artifact-upload target on failure, so they ride for free on existing infrastructure. The watcher is killed cleanly after `pnpm test` returns so it never holds the runner open. On the next captured silent ELIFECYCLE we'll have, for the first time, a 500 ms-resolution external observation of TCP and process state across the death window. Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com> |
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