The shutdown RPC call to the worker thread never resolved because the worker's event loop drained after cleanup, preventing the postMessage result from being delivered back to the main thread. This left process.exit() unreachable and the process hanging indefinitely.
Replace the blocking await with a fire-and-forget shutdown RPC that waits for the worker's close event (up to 5s timeout) before calling worker.terminate().
Alex Alecu
779121f9e7