From 3c5354869e993ab645f85a2c73ce72f8af014de2 Mon Sep 17 00:00:00 2001
From: theanarkh <theratliter@gmail.com>
Date: Sun, 28 Aug 2022 23:03:12 +0800
Subject: [PATCH] cluster: fix cluster rr distribute error

PR-URL: https://github.com/nodejs/node/pull/44202
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 lib/internal/cluster/round_robin_handle.js |  4 +++
 test/parallel/test-cluster-accept-fail.js  | 30 ++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 test/parallel/test-cluster-accept-fail.js

diff --git a/lib/internal/cluster/round_robin_handle.js b/lib/internal/cluster/round_robin_handle.js
index a881ca10bcb9de..29a87e716e8f21 100644
--- a/lib/internal/cluster/round_robin_handle.js
+++ b/lib/internal/cluster/round_robin_handle.js
@@ -98,6 +98,10 @@ RoundRobinHandle.prototype.remove = function(worker) {
 };
 
 RoundRobinHandle.prototype.distribute = function(err, handle) {
+  // If `accept` fails just skip it (handle is undefined)
+  if (err) {
+    return;
+  }
   append(this.handles, handle);
   // eslint-disable-next-line node-core/no-array-destructuring
   const [ workerEntry ] = this.free; // this.free is a SafeMap
diff --git a/test/parallel/test-cluster-accept-fail.js b/test/parallel/test-cluster-accept-fail.js
new file mode 100644
index 00000000000000..29d57783a9d11f
--- /dev/null
+++ b/test/parallel/test-cluster-accept-fail.js
@@ -0,0 +1,30 @@
+// Flags: --expose-internals
+'use strict';
+const common = require('../common');
+const assert = require('assert');
+const net = require('net');
+const cluster = require('cluster');
+const rr = require('internal/cluster/round_robin_handle');
+
+if (cluster.isPrimary) {
+  const distribute = rr.prototype.distribute;
+  rr.prototype.distribute = function(err, handle) {
+    assert.strictEqual(err, 0);
+    handle.close();
+    distribute.call(this, -1, undefined);
+  };
+  cluster.schedulingPolicy = cluster.SCHED_RR;
+  cluster.fork();
+} else {
+  const server = net.createServer(common.mustNotCall());
+  server.listen(0, common.mustCall(() => {
+
+    const socket = net.connect(server.address().port);
+
+    socket.on('close', common.mustCall(() => {
+      server.close(common.mustCall(() => {
+        process.disconnect();
+      }));
+    }));
+  }));
+}