stream: fix regression on duplex end #35941

mmomtchev · 2020-11-03T09:53:25Z

Decide the return status of writeOrBuffer before
calling stream.write which can reset state.length

Fixes: #35926

Checklist

make -j4 test (UNIX), or vcbuild test (Windows) passes
tests and/or benchmarks are included
documentation is changed or added
commit message follows commit guidelines

nodejs-github-bot · 2020-11-03T09:53:30Z

Review requested:

@nodejs/streams

ronag · 2020-11-03T10:00:42Z

Missing test. Also I would like to understand how this can fix that issue. This seems wrong to me.

mcollina · 2020-11-03T10:16:10Z

test/parallel/test-stream-duplex-readable-end.js

+  dst.removeAllListeners();
+}
+
+dst.on('data', data => console.log(data));


please remove the console.log and use a common.mustCall() with an assertion instead.

I reshuffled it a little bit, 'data' doesn't get called on correct execution - but must be there in order to trigger the reading

mcollina · 2020-11-03T10:16:56Z

test/parallel/test-stream-duplex-readable-end.js

+  read: common.mustCallAtMost(() => {
+    if (loops--)
+      src.push(Buffer.alloc(20000));
+  }, 2)


I think this should be a mustCall(), not mustCallAtMost(). The algorithm is deterministic.

nodejs-github-bot · 2020-11-03T10:24:14Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34034/

mmomtchev · 2020-11-03T10:29:24Z

Missing test. Also I would like to understand how this can fix that issue. This seems wrong to me.

Obtained by blindly comparing NODE_DEBUG outputs of node 12 vs node-master - they remain remarkably similar despite the fact that the code base has been throughly refactored

mmomtchev · 2020-11-03T10:35:10Z

Missing test. Also I would like to understand how this can fix that issue. This seems wrong to me.

Obtained by blindly comparing NODE_DEBUG outputs of node 12 vs node-master - they remain remarkably similar despite the fact that the code base has been throughly refactored

Maybe it just reproduces the bug that made it working 😄

ronag · 2020-11-03T10:41:01Z

I feel there is a more fundamental issue here and suspect that this might just hide it.

mmomtchev · 2020-11-03T10:47:10Z

I feel there is a more fundamental issue here and suspect that this might just hide it.

I spent two hours yesterday evening and couldn't fully understand it. My theory is that returning false from _write pauses the stream and gives the 'end' chance to get delivered. Otherwise everything remains stuck in an endless loop with the 'end' waiting in a nextTick handler.

ronag · 2020-11-03T10:53:12Z

I mean part of the problem here is that Readable.push(null) does not Writable.end() the writable side of the Transform.

We could fix that by:

if (this.readableEnded) {
  this.end()
}

inside the transform callback but that would cause a write after end error as I mentioned here.

ronag · 2020-11-03T10:55:22Z

Just to be clear that I don't mind landing this PR to fix behavior regression (it has some perf regression for sync case) but I don't think it actually solves the fundamental problem here.

mcollina

lgtm, I think this is fine.

nodejs-github-bot · 2020-11-03T11:16:47Z

CI: https://ci.nodejs.org/job/node-test-pull-request/34035/

benjamingr

Echoing Robert's "the fundamental issue needs addressing but this can land in the meantime" sentiment.

puzrin · 2020-11-03T17:32:58Z

Sorry if naive question. When this can be released?

mcollina · 2020-11-03T17:51:20Z

This can land in another 40 hours. Then it'll ship in the next v15 in the next week or so. It needs to sit in a current release before being bumped to LTS for 2 weeks. My best guess is at least a month, if not a month and a half.

Given that it seems a pretty urgent regression, we might be ok in short-circuiting this. What do @nodejs/tsc @nodejs/releasers @nodejs/lts think?

richardlau · 2020-11-03T17:55:50Z

@mcollina Do you know when the regression went out in the LTS releases? I'm open to short-circuiting the wait time if it's a recent regression and this PR has sign off from @nodejs/streams.

mcollina · 2020-11-03T17:59:07Z

@richardlau I think this has been there for most of v14 current cycle - not recent at all. It's not in v12.

puzrin · 2020-11-03T18:20:12Z

Just checked. This bug appeared in v14.1.0. Previous versions not affected.

richardlau · 2020-11-03T18:59:38Z

@targos has been preparing a 15.x release for tomorrow, so if this should be urgently fixed perhaps fast tracking into tomorrow's release is an option? We pencilled in a 14.x release for this month but AFAIK haven't settled on an exact date but if this does go out in tomorrow's 15.x release it'll probably make it into the next 14.x release without needing to short circuit LTS wait times.

mcollina · 2020-11-03T19:03:46Z

Then let's fast-track this

mcollina · 2020-11-03T19:04:05Z

cc @nodejs/tsc for awareness

mmomtchev · 2020-11-20T13:07:09Z

@Trott , @lpinca was this supposed to be included? I am sorry if it was up to me to backport it? What is the usual process when a PR needs backporting?

Trott · 2020-11-20T16:17:05Z

@Trott , @lpinca was this supposed to be included? I am sorry if it was up to me to backport it? What is the usual process when a PR needs backporting?

I think releasers will cherry-pick and leave a note here if it doesn't land cleanly. @nodejs/releasers Should a backport to 14.x be opened at this time? Or hold off?

@mmomtchev If you're confident that this will not be able to be cherry-picked to the v14.x-staging branch and that it should be included, you can get open a backport release by following the instructions at https://github.com/nodejs/node/blob/master/doc/guides/backporting-to-release-lines.md.

puzrin · 2020-11-20T16:48:04Z

May be reopen #35926 until fix in v14 (LTS)? Bug is serious, IMO.

mmomtchev · 2020-11-20T17:00:46Z

I am confident, the file I modified does not exist on v14.x

Backport Decide the return status of writeOrBuffer before calling stream.write which can reset state.length Refs: nodejs#35941 Fixes: nodejs#35926

mmomtchev · 2020-11-22T18:07:12Z

@puzrin @Trott I submitted a PR to v14.x-staging with a backport of this change

- Remove unneeded listener for the `'error'` event. - Use `common.mustCall()`. - Verify that the `src` stream gets paused. PR-URL: #36056 Refs: #35941 Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

Backport Decide the return status of writeOrBuffer before calling stream.write which can reset state.length Refs: nodejs#35941 Fixes: nodejs#35926

Decide the return status of writeOrBuffer before calling stream.write which can reset state.length Add unit test for #35926 Refs: #35926 Backport-PR-URL: #36375 PR-URL: #35941 Fixes: #35926 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>

- Remove unneeded listener for the `'error'` event. - Use `common.mustCall()`. - Verify that the `src` stream gets paused. PR-URL: #36056 Refs: #35941 Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

Decide the return status of writeOrBuffer before calling stream.write which can reset state.length Add unit test for #35926 Refs: #35926 Backport-PR-URL: #36375 PR-URL: #35941 Fixes: #35926 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>

- Remove unneeded listener for the `'error'` event. - Use `common.mustCall()`. - Verify that the `src` stream gets paused. PR-URL: #36056 Refs: #35941 Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

Notable Changes: - **deps**: - upgrade npm to 6.14.9 (Myles Borins) #36450 - update acorn to v8.0.4 (Michaël Zasso) #35791 - **doc**: add release key for Danielle Adams (Danielle Adams) #35545 - **http2**: check write not scheduled in scope destructor (David Halls) #36241 - **stream**: fix regression on duplex end (Momtchil Momtchev) #35941 PR-URL: #36476

Decide the return status of writeOrBuffer before calling stream.write which can reset state.length Add unit test for #35926 Refs: #35926 Backport-PR-URL: #36375 PR-URL: #35941 Fixes: #35926 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com>

- Remove unneeded listener for the `'error'` event. - Use `common.mustCall()`. - Verify that the `src` stream gets paused. PR-URL: #36056 Refs: #35941 Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com> Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Ricky Zhou <0x19951125@gmail.com>

Notable Changes: - **deps**: - upgrade npm to 6.14.9 (Myles Borins) #36450 - update acorn to v8.0.4 (Michaël Zasso) #35791 - **doc**: add release key for Danielle Adams (Danielle Adams) #35545 - **http2**: check write not scheduled in scope destructor (David Halls) #36241 - **stream**: fix regression on duplex end (Momtchil Momtchev) #35941 PR-URL: #36476

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mcollina added the fast-track PRs that do not need to wait for 48 hours to land. label Nov 3, 2020

mcollina mentioned this pull request Nov 3, 2020

v15.1.0 release proposal #35948

Merged

mmomtchev added a commit to mmomtchev/node that referenced this pull request Nov 22, 2020

stream: fix regression on duplex end

c6fa9a6

Backport Decide the return status of writeOrBuffer before calling stream.write which can reset state.length Refs: nodejs#35941 Fixes: nodejs#35926

wa-Nadoo mentioned this pull request Nov 22, 2020

stream: avoid drain for sync streams #32887

Closed

4 tasks

enov pushed a commit to enov/node that referenced this pull request Dec 4, 2020

stream: fix regression on duplex end

b0a1830

Backport Decide the return status of writeOrBuffer before calling stream.write which can reset state.length Refs: nodejs#35941 Fixes: nodejs#35926

enov mentioned this pull request Dec 4, 2020

[14.x] stream: fix regression on duplex end #36375

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3 tasks

BethGriggs mentioned this pull request Dec 10, 2020

v14.15.2 proposal #36476

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This was referenced Dec 18, 2020

[bug] POST -> Premature close stream fastify/fastify#2739

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POST -> Premature close? sindresorhus/got#1556

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amotzte mentioned this pull request Jan 5, 2021

Can you upgrade chrome docker to latest LTS node.js? browserless/browserless#1200

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Heerschop mentioned this pull request Jan 19, 2021

Script execution can freeze chanzo/script-launcher#128

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clshortfuse mentioned this pull request Feb 3, 2021

HTTP responses on Node v14.15.2+ hang #37210

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targos added backported-to-v14.x stream Issues and PRs related to the stream subsystem. and removed fast-track PRs that do not need to wait for 48 hours to land. labels Apr 25, 2021

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stream: fix regression on duplex end #35941

stream: fix regression on duplex end #35941

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stream: fix regression on duplex end #35941

stream: fix regression on duplex end #35941

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