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timers: prevent infinite loop when subsequent immediates are cleared #9759

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timers: prevent infinite loop when subsequent immediates are cleared #9759

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4 changes: 3 additions & 1 deletion lib/timers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -580,8 +580,10 @@ function processImmediate() {
while (immediate) {
domain = immediate.domain;

if (!immediate._onImmediate)
if (!immediate._onImmediate) {
immediate = immediate._idleNext;
continue;
}

if (domain)
domain.enter();
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23 changes: 23 additions & 0 deletions test/parallel/test-timers-regress-GH-9765.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
'use strict';
const common = require('../common');

// This test ensures that if an Immediate callback clears subsequent
// immediates we don't get stuck in an infinite loop.
//
// If the process does get stuck, it will be timed out by the test
// runner.
//
// Ref: https://github.com/nodejs/node/issues/9756

setImmediate(common.mustCall(function() {
clearImmediate(i2);
clearImmediate(i3);
}));

const i2 = setImmediate(function() {
common.fail('immediate callback should not have fired');
});

const i3 = setImmediate(function() {
common.fail('immediate callback should not have fired');
});