lib: fix timer leak

lib/internal/timers.js

@@ -152,6 +152,11 @@ const timerListQueue = new PriorityQueue(compareTimersLists, setPosition);
 // - value = linked list
 const timerListMap = { __proto__: null };
 
+// This stores all the known timer async ids to allow users to clearTimeout and
+// clearInterval using those ids, to match the spec and the rest of the web
+// platform.
+const knownTimersById = { __proto__: null };
+
 function initAsyncResource(resource, type) {
   const asyncId = resource[async_id_symbol] = newAsyncId();
   const triggerAsyncId =
@@ -550,6 +555,9 @@ function getTimerCallbacks(runNextTicks) {
         if (!timer._destroyed) {
           timer._destroyed = true;
 
+          if (timer[kHasPrimitive])
+            delete knownTimersById[asyncId];
+
           if (timer[kRefed])
             timeoutInfo[0]--;
 
@@ -580,6 +588,9 @@ function getTimerCallbacks(runNextTicks) {
         } else if (!timer._idleNext && !timer._idlePrev && !timer._destroyed) {
           timer._destroyed = true;
 
+          if (timer[kHasPrimitive])
+            delete knownTimersById[asyncId];
+
           if (timer[kRefed])
             timeoutInfo[0]--;
 
@@ -683,4 +694,5 @@ module.exports = {
   timerListQueue,
   decRefCount,
   incRefCount,
+  knownTimersById,
 };

lib/timers.js

@@ -52,6 +52,7 @@ const {
   active,
   unrefActive,
   insert,
+  knownTimersById,
 } = require('internal/timers');
 const {
   promisify: { custom: customPromisify },
@@ -71,11 +72,6 @@ const {
   emitDestroy,
 } = require('internal/async_hooks');
 
-// This stores all the known timer async ids to allow users to clearTimeout and
-// clearInterval using those ids, to match the spec and the rest of the web
-// platform.
-const knownTimersById = { __proto__: null };
-
 // Remove a timer. Cancels the timeout and resets the relevant timer properties.
 function unenroll(item) {
   if (item._destroyed)

test/parallel/test-primitive-timer-leak.js

@@ -0,0 +1,23 @@
+'use strict';
+// Flags: --expose-gc
+require('../common');
+const onGC = require('../common/ongc');
+
+// See https://github.com/nodejs/node/issues/53335
+const poller = setInterval(() => {
+  global.gc();
+}, 100);
+
+let count = 0;
+
+for (let i = 0; i < 10; i++) {
+  const timer = setTimeout(() => {}, 0);
+  onGC(timer, {
+    ongc: () => {
+      if (++count === 10) {
+        clearInterval(poller);
+      }
+    }
+  });
+  console.log(+timer);
+}