vm Script memory leak in Node.js 14 / 16 #40014
Description
Version
14 / 16
Platform
x64 macOS / Linux
Subsystem
vm
What steps will reproduce the bug?
'use strict';
let times = 0;
function run() {
let str = 'var a = "';
for (let i = 0; i < 100 * 1024 / 18; i++) str += Math.random().toString();
str += '";';
const script = new (require('vm').Script)(str);
times++;
if (times % 1000 === 0) console.log(times);
}
(async () => {
while (true) {
run();
await new Promise(resolve => {
setTimeout(() => {
resolve();
}, 10);
});
gc();
}
})();Run with:
$ node --expose-gc --max-heap-size=100 test.jsIt will occur heap OOM under Node.js 14 and 16, and Node.js 12 is OK.
<--- Last few GCs --->
[1430950:0x55695b1dc4b0] 6372 ms: Mark-sweep 72.0 (91.6) -> 71.6 (91.8) MB, 4.3 / 0.0 ms (average mu = 0.728, current mu = 0.778) testing GC in old space requested
[1430950:0x55695b1dc4b0] 6388 ms: Mark-sweep 72.2 (91.8) -> 71.8 (92.1) MB, 3.1 / 0.0 ms (average mu = 0.760, current mu = 0.804) testing GC in old space requested
[1430950:0x55695b1dc4b0] 6403 ms: Mark-sweep 72.4 (92.1) -> 72.0 (92.3) MB, 2.9 / 0.0 ms (average mu = 0.781, current mu = 0.806) testing GC in old space requested
<--- JS stacktrace --->
FATAL ERROR: MarkCompactCollector: young object promotion failed Allocation failed - JavaScript heap out of memory
How often does it reproduce? Is there a required condition?
Every time.
What is the expected behavior?
Not OOM.
What do you see instead?
OOM.
Additional information
No response