lib: fix reference leak

benchmark/process/next-tick-loop-args.js

@@ -0,0 +1,37 @@
+'use strict';
+const common = require('../common.js');
+const bench = common.createBenchmark(main, {
+  n: [1e4, 2e4, 4e4],
+  loop: [1e2, 2e2],
+});
+
+function main({ n, loop }) {
+  bench.start();
+  run();
+  function run() {
+    let j = 0;
+
+    function cb() {
+      j++;
+      if (j === n) {
+        loop--;
+        if (loop === 0) {
+          bench.end(n);
+        } else {
+          run();
+        }
+      }
+    }
+
+    for (let i = 0; i < n; i++) {
+      if (i % 4 === 0)
+        process.nextTick(cb, i, true, 10, 'test');
+      else if (i % 3 === 0)
+        process.nextTick(cb, i, true, 10);
+      else if (i % 2 === 0)
+        process.nextTick(cb, i, 20);
+      else
+        process.nextTick(cb, i);
+    }
+  }
+}

benchmark/process/next-tick-loop.js

@@ -0,0 +1,30 @@
+'use strict';
+const common = require('../common.js');
+const bench = common.createBenchmark(main, {
+  n: [1e4, 2e4, 4e4],
+  loop: [1e2, 2e2],
+});
+
+function main({ n, loop }) {
+  bench.start();
+  run();
+  function run() {
+    let j = 0;
+
+    function cb() {
+      j++;
+      if (j === n) {
+        loop--;
+        if (loop === 0) {
+          bench.end(n);
+        } else {
+          run();
+        }
+      }
+    }
+
+    for (let i = 0; i < n; i++) {
+      process.nextTick(cb);
+    }
+  }
+}

lib/internal/fixed_queue.js

@@ -111,6 +111,7 @@ module.exports = class FixedQueue {
     if (tail.isEmpty() && tail.next !== null) {
       // If there is another queue, it forms the new tail.
       this.tail = tail.next;
+      tail.next = null;
     }
     return next;
   }