writeHeapSnapshot causes Segmentation fault

[chriskinsman]

v14.16.0:
Linux scheduler-deployment-c477958d6-v897r 5.4.95-42.163.amzn2.x86_64 #1 SMP Thu Feb 4 12:50:05 UTC 2021 x86_64 Linux:
v8:

What steps will reproduce the bug?

const { writeHeapSnapshot } = require('v8');
function dump() {
    const fileName = '/var/log/' + Date.now() + '.heapsnapshot';
    console.info('Writing heapsnapshot to: ' + fileName);
    writeHeapSnapshot(fileName);
}
dump();

setInterval(function () {
    dump();
}, 1000 * 60 * 60);

How often does it reproduce? Is there a required condition?

Happens everytime

What is the expected behavior?

Write a heapsnapshot

What do you see instead?

Segmentation fault

Additional information

The nodejs code is running inside a container running on AWS EKS Kubernetes. Not sure if relevant

[aduh95]

I'm not able to reproduce on Node.js v15.12.0 (macOS x64_86).

[chriskinsman]

I can confirm I can't make it happen either on v15.12.0. I was able to repro with v14.1.0, v14.15.0 and v14.16.0

[mhdawson]

I see "1000 * 60 * 60" , so once an hour? Does it crash for you immediately or after some time?

I'm running on RHEL 8 with v14.16.0 and shortened the interval to 10s, it ran/generated 40 heapdumps without any crash before I stopped it. I did have to change the location from /var/log to the local directory but assume that would not be related.

Just to confirm, when you see the crash the code provided is the only code you are running right?

[chriskinsman]

Yes. Immediately crashes.

Docker container that replicates issue: ghcr.io/chriskinsman/tilloo:sha-1fc4c52e

[mhdawson]

Are you using the Community Node.js binaries and can you recreate in a base RHEL container like ubi8 ?

[chriskinsman]

Using the nodejs provided alpine image. Ie 14-alpine as my base

…

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On Apr 7, 2021, at 3:21 PM, Michael Dawson ***@***.***> wrote:  Are you using the Community Node.js binaries and can you recreate in a base RHEL container like ubi8 ? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

[mhdawson]

Sorry confused myself I had thought you said RHEL 8 but that was me. Alpine does use a different glibc (and is at the experimental tier - https://github.com/nodejs/node/blob/master/BUILDING.md#platform-list) which may be related. Does it recreate with the Alpine image without any additions?