events: remove weak listener for event target by rluvaton · Pull Request #48952 · nodejs/node · GitHub

need to add a test

Why not make this a separate, standalone function instead of adding it to the prototype (as a non-standard function)?

good question, Because it accesses the instance internals and I want to make it close to the other remove listener 😄

My general impression is that for web standards APIs, node tries to avoid exposing non-standard properties and functions.

I don't plan to expose it as plain function, either extracting or use symbol as a key

I'm thinking maybe just remove the while as we are sure that this exists unless there is some weird thing that can happen here...

Is there a better way to test 🤔 feels like this could be flakey

This is a good question but to reduce flakiness this test would be to not run in parallel with other tests, will move it to a different file

#48952 (comment)

this 100 sounds like a magic number which would not be truly reliable... (I don't have a better idea of how to test this though)

Removed the test as it did not work for some reason...

@rluvaton I wrote this in another conversation, but I feel it belongs here...
Maybe using a WeakRef[] etc we can ensure the values are gone after globalThis.gc();, instead of checking an increase in memory? (meaning add them wrapped by WeakRef into an array during the createALotOfAbortSignals setup)

great idea, the test was added :)

removed the test as it can be flaky and instead checked that the memory leak warning was not emitted...

Also cc @nodejs/events

I am not sure why this requires the async iife wrapper, or the sleeps

without the sleep, the test would fail (as I assume the GC happen in a different thread when having more than 1 core)

@rluvaton so is 10ms trust-worthy?

I used 10ms like the rest

increased to 100ms and hope the test now pass

I replaced the test with another one that check that the memory leak warning not emitted which would be faster and have the same result

CI: https://ci.nodejs.org/job/node-test-pull-request/53013/

@rluvaton the test seems to be failing 😕

not ok 244 parallel/test-abortcontroller
  ---
  duration_ms: 244.52900
  severity: fail
  exitcode: 1
  stack: |-
    node:internal/process/promises:289
                triggerUncaughtException(err, true /* fromPromise */);
                ^
    
    AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
    + actual - expected
    
    + AbortSignal {
    +   [Symbol(events.maxEventTargetListeners)]: 10,
    +   [Symbol(events.maxEventTargetListenersWarned)]: false,
    +   [Symbol(kAborted)]: false,
    +   [Symbol(kComposite)]: false,
    +   [Symbol(kEvents)]: SafeMap(1) [Map] {
    +     'abort' => <ref *1> {
    +       next: Listener {
    +         callback: SafeWeakRef [WeakRef] {},
    +         flags: 81,
    +         listener: SafeWeakRef [WeakRef] {},
    +         next: undefined,
    +         previous: [Circular *1]
    +       },
    +       resistStopPropagation: true,
    +       size: 1
    +     }
    +   },
    +   [Symbol(kHandlers)]: SafeMap(0) [Map] {},
    +   [Symbol(kReason)]: undefined,
    +   [Symbol(kTimeout)]: true
    + }
    - undefined
        at /home/iojs/build/workspace/node-test-commit-linux/test/parallel/test-abortcontroller.js:256:5 {
      generatedMessage: true,
      code: 'ERR_ASSERTION',
      actual: AbortSignal {
        [Symbol(kEvents)]: SafeMap(1) [Map] {
          'abort' => <ref *1> {
            size: 1,
            next: Listener {
              next: undefined,
              previous: [Circular *1],
              listener: SafeWeakRef [WeakRef] {},
              flags: 81,
              callback: SafeWeakRef [WeakRef] {}
            },
            resistStopPropagation: true
          }
        },
        [Symbol(events.maxEventTargetListeners)]: 10,
        [Symbol(events.maxEventTargetListenersWarned)]: false,
        [Symbol(kHandlers)]: SafeMap(0) [Map] {},
        [Symbol(kAborted)]: false,
        [Symbol(kReason)]: undefined,
        [Symbol(kComposite)]: false,
        [Symbol(kTimeout)]: true
      },
      expected: undefined,
      operator: 'strictEqual'
    }
    
    Node.js v21.0.0-pre
  ...

CI: https://ci.nodejs.org/job/node-test-pull-request/53033/

CI: https://ci.nodejs.org/job/node-test-pull-request/53052/

Why not?

Suggested change

      
                  await setTimeout(0);
          
                  await Promise.resolve();

because it won't GC with this

CI: https://ci.nodejs.org/job/node-test-pull-request/53183/

CI: https://ci.nodejs.org/job/node-test-pull-request/53191/

CI: https://ci.nodejs.org/job/node-test-pull-request/53196/

CI: https://ci.nodejs.org/job/node-test-pull-request/53239/

Landed in c39f04c

Fixes: nodejs#48951 PR-URL: nodejs#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Fixes: #48951 PR-URL: #48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Fixes: nodejs#48951 PR-URL: nodejs#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Fixes: #48951 PR-URL: #48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Was this included in, or is planned to be included in v18?

Was this included in, or is planned to be included in v18?

This was released just in v20.6.0, which means it will take some time to reach v18 which is LTS, but hopefully it should happen soon 🙂

Fixes: #48951 PR-URL: #48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Fixes: nodejs/node#48951 PR-URL: nodejs/node#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

nodejs-github-bot added the needs-ci PRs that need a full CI run. label Jul 28, 2023

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rluvaton commented Jul 28, 2023

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rluvaton marked this pull request as ready for review July 28, 2023 15:35

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rluvaton marked this pull request as draft July 30, 2023 13:20

rluvaton marked this pull request as ready for review July 30, 2023 16:05

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CI Reliability 2023-08-01 nodejs/reliability#630

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CI Reliability 2023-08-02 nodejs/reliability#631

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nodejs-github-bot merged commit c39f04c into nodejs:main Aug 12, 2023

rluvaton deleted the fix-memory-leak-in-abort-signal-and-weak-listeners branch August 12, 2023 18:22

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CI Reliability 2023-08-13 nodejs/reliability#635

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Ceres6 pushed a commit to Ceres6/node that referenced this pull request Aug 14, 2023

events: remove weak listener for event target

4bf139e

Fixes: nodejs#48951 PR-URL: nodejs#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

Ceres6 pushed a commit to Ceres6/node that referenced this pull request Aug 14, 2023

events: remove weak listener for event target

b1a29cf

Fixes: nodejs#48951 PR-URL: nodejs#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

RafaelGSS pushed a commit that referenced this pull request Aug 15, 2023

events: remove weak listener for event target

fd6885b

Fixes: #48951 PR-URL: #48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

UlisesGascon mentioned this pull request Aug 15, 2023

v20.6.0 proposal #49185

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RafaelGSS pushed a commit to RafaelGSS/node that referenced this pull request Aug 15, 2023

events: remove weak listener for event target

b822792

Fixes: nodejs#48951 PR-URL: nodejs#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

RafaelGSS pushed a commit that referenced this pull request Aug 16, 2023

events: remove weak listener for event target

eb6e6fc

Fixes: #48951 PR-URL: #48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

RafaelGSS pushed a commit that referenced this pull request Aug 17, 2023

events: remove weak listener for event target

d568600

Fixes: #48951 PR-URL: #48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

targos pushed a commit that referenced this pull request Nov 27, 2023

events: remove weak listener for event target

acd9872

Fixes: #48951 PR-URL: #48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

targos mentioned this pull request Nov 28, 2023

v18.19.0 release proposal #50953

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sercher added a commit to sercher/graaljs that referenced this pull request Apr 25, 2024

events: remove weak listener for event target

513495a

Fixes: nodejs/node#48951 PR-URL: nodejs/node#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

sercher added a commit to sercher/graaljs that referenced this pull request Apr 25, 2024

events: remove weak listener for event target

fb734ce

Fixes: nodejs/node#48951 PR-URL: nodejs/node#48952 Reviewed-By: Chemi Atlow <chemi@atlow.co.il>

events: remove weak listener for event target by rluvaton · Pull Request #48952 · nodejs/node · GitHub

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events: remove weak listener for event target - #48952

events: remove weak listener for event target#48952nodejs-github-bot merged 19 commits intonodejs:mainnodejs/node:mainfrom rluvaton:fix-memory-leak-in-abort-signal-and-weak-listenersrluvaton/node:fix-memory-leak-in-abort-signal-and-weak-listenersCopy head branch name to clipboard

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nodejs-github-bot commented Aug 11, 2023

events: remove weak listener for event target#48952
nodejs-github-bot merged 19 commits into
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rluvaton:fix-memory-leak-in-abort-signal-and-weak-listeners

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