investigate flaky test: test-cluster-net-listen-ipv6only-rr #25813

09:43:31 not ok 333 parallel/test-cluster-net-listen-ipv6only-rr
09:43:31   ---
09:43:31   duration_ms: 0.512
09:43:31   severity: fail
09:43:31   exitcode: 1
09:43:31   stack: |-
09:43:31     events.js:173
09:43:31           throw er; // Unhandled 'error' event
09:43:31           ^
09:43:31     
09:43:31     Error: listen EADDRINUSE: address already in use 0.0.0.0:42338
09:43:31         at Server.setupListenHandle [as _listen2] (net.js:1232:14)
09:43:31         at listenInCluster (net.js:1280:12)
09:43:31         at doListen (net.js:1419:7)
09:43:31         at processTicksAndRejections (internal/process/next_tick.js:76:17)
09:43:31     Emitted 'error' event at:
09:43:31         at emitErrorNT (net.js:1259:8)
09:43:31         at processTicksAndRejections (internal/process/next_tick.js:76:17)
09:43:31   ...