timers: truncate decimal values #24819

Fishrock123 · 2018-12-04T01:57:19Z

Reverts some timers behavior back to as it was before 2930bd1.

That commit introduced an unintended change which allowed non-integer timeouts to actually exist since the value is no longer converted to an integer via a TimeWrap handle directly.

Even with the fix in e9de435 non-integer timeouts are still indeterministic, because libuv does not support them.

This fixes the issue by emulating the old behavior: truncate the _idleTimeout before using it.

See comments in #24214 for more background on this.

In hindsight, I actually think this discovery makes 2930bd1 semver-major. I think that commit has perhaps spread too far to just 'undo' it, so I think reverting the behavior (not necessarily the code) is the best choice of action.

Note: libuv doesn't even support non-integer / sub-millisecond timers so really we can't even support sub-millisecond timers (the only real use for non-integer timeouts).
(I don't think supporting sub-millisecond timers is particularly useful, either.)

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 · 2018-12-04T01:57:21Z

@Fishrock123 build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/1817/pipeline

Fishrock123 · 2018-12-04T02:30:48Z

cc @nodejs/timers

CI: https://ci.nodejs.org/job/node-test-pull-request/19172/

test/parallel/test-timers-non-integer-delay.js

apapirovski · 2018-12-04T03:17:52Z

Approved but there might be a few edge cases that I need to test. Will let you know. If possible, please avoid merging until then.

bnoordhuis · 2018-12-04T11:20:54Z

libuv doesn't even support non-integer / sub-millisecond timers

Adding a uv_hrtimer_t handle type isn't out of the question, if there is a need for it.

Fishrock123 · 2018-12-04T17:39:18Z

libuv doesn't even support non-integer / sub-millisecond timers

Adding a uv_hrtimer_t handle type isn't out of the question, if there is a need for it.

Right, but we probably want to have that discussion elsewhere (if we want to have it), since there is some broken behavior in here currently.

apapirovski · 2018-12-07T03:13:59Z

I’m going to be testing the issue I have in mind tomorrow.

apapirovski · 2018-12-07T03:15:31Z

In hindsight, I actually think this discovery makes 2930bd1 semver-major. I think that commit has perhaps spread too far to just 'undo' it, so I think reverting the behavior (not necessarily the code) is the best choice of action.

That commit is semver-major afaik. Not sure I follow.

danbev · 2018-12-07T04:50:23Z

CI: https://ci.nodejs.org/job/node-test-pull-request/19295/

danbev · 2018-12-11T04:47:28Z

Re-run of failing node-test-commit-osx

Fishrock123 · 2018-12-11T05:24:57Z

@apapirovski did you get around to testing it?

apapirovski · 2018-12-13T04:19:47Z

@Fishrock123 you need to make sure that any time something like lists[item._idleTimeout] occurs, we use the truncated value. So line 384, needs to be lists[Math.trunc(item._idleTimeout)]. Then the behavior should be good. I'm going to spot check if any other places are affected.

Fishrock123 · 2018-12-13T19:57:59Z

@apapirovski Done, looks like just covering that spot is good enough. New CI: https://ci.nodejs.org/job/node-test-pull-request/19491/

(guess I maybe should add a test for that case though..)

TimothyGu · 2018-12-13T20:02:28Z

Potentially dumb question: why don't we truncate during setTimeout() or setInterval()?

Fishrock123 · 2018-12-14T01:34:06Z

@TimothyGu not dumb. The reason is that the timer api is... well... a bit too flexible due to historic reasons, so this way more reliably catches what a user could feed in.

One day, probably a year or so after active() is deprecated, this will no longer be an issue, hopefully.

Fishrock123 · 2018-12-19T02:26:26Z

test.parallel/test-child-process-execfile failed on nodes=alpine-latest-x64, I don't know why but as far as I am aware there aren't any other tests with non-decimal timeouts.

assert.js:753
    throw newErr;
    ^

AssertionError [ERR_ASSERTION]: ifError got unwanted exception: Command failed: /home/iojs/build/workspace/node-test-commit-linux/nodes/alpine-latest-x64/out/Release/node /home/iojs/build/workspace/node-test-commit-linux/nodes/alpine-latest-x64/test/fixtures/exit.js 0

    at ChildProcess.exithandler (child_process.js:294:12)
    at ChildProcess.emit (events.js:189:13)
    at maybeClose (internal/child_process.js:978:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:265:5)

Fishrock123 · 2019-01-23T23:50:14Z

~~Another rebase + CI. Hopefully everything is more stable this time around.~~

~~https://ci.nodejs.org/job/node-test-pull-request/20295/~~

Edit: again, after rebase to pull in more test fixes https://ci.nodejs.org/job/node-test-pull-request/20378/

Reverts some timers behavior back to as it was before 2930bd1 That commit introduced an unintended change which allowed non-integer timeouts to actually exist since the value is no longer converted to an integer via a TimeWrap handle directly. Even with the fix in e9de435 non-integer timeouts are still indeterministic, because libuv does not support them. This fixes the issue by emulating the old behavior: truncate the `_idleTimeout` before using it. See comments in nodejs#24214 for more background on this.

Fishrock123 · 2019-01-29T00:25:43Z

Landed in a7c66b6

Reverts some timers behavior back to as it was before 2930bd1 That commit introduced an unintended change which allowed non-integer timeouts to actually exist since the value is no longer converted to an integer via a TimeWrap handle directly. Even with the fix in e9de435 non-integer timeouts are still indeterministic, because libuv does not support them. This fixes the issue by emulating the old behavior: truncate the `_idleTimeout` before using it. See comments in #24214 for more background on this. PR-URL: #24819 Reviewed-By: Anatoli Papirovski <[email protected]> Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: Trivikram Kamat <[email protected]> Reviewed-By: James M Snell <[email protected]>

Fishrock123 added the timers Issues and PRs related to the timers subsystem / setImmediate, setInterval, setTimeout. label Dec 4, 2018

Fishrock123 requested a review from apapirovski December 4, 2018 01:57

Fishrock123 force-pushed the timers-non-integer-delay branch from a0b2aa4 to 77d6fdf Compare December 4, 2018 02:00

richardlau reviewed Dec 4, 2018

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apapirovski approved these changes Dec 4, 2018

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Fishrock123 mentioned this pull request Dec 4, 2018

flaky: sequential/test-cli-syntax-* #24403

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Fishrock123 force-pushed the timers-non-integer-delay branch from 77d6fdf to 387130e Compare December 4, 2018 17:51

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joyeecheung mentioned this pull request Dec 5, 2018

CI failures: 20181201-20181205 nodejs/reliability#19

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richardlau mentioned this pull request Dec 7, 2018

setTimeout eating CPU time and doing infinity stuck with non-whole delay #24897

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trivikr approved these changes Dec 8, 2018

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Fishrock123 force-pushed the timers-non-integer-delay branch from 387130e to 4c0f21e Compare December 13, 2018 19:56

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Fishrock123 force-pushed the timers-non-integer-delay branch from 4c0f21e to 9c7c99e Compare January 14, 2019 19:05

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This was referenced Jan 16, 2019

CI failures: 20190110 - 20190116 nodejs/reliability#20

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Investigate flaky known_issues/test-vm-timeout-escape-queuemicrotask #25529

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Fishrock123 force-pushed the timers-non-integer-delay branch from 9c7c99e to 339e7b8 Compare January 23, 2019 23:49

Fishrock123 force-pushed the timers-non-integer-delay branch from 339e7b8 to 10e70b6 Compare January 28, 2019 17:08

Fishrock123 closed this Jan 29, 2019

Fishrock123 deleted the timers-non-integer-delay branch January 29, 2019 00:25

targos mentioned this pull request Jan 29, 2019

v11.9.0 proposal #25802

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timers: truncate decimal values #24819

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timers: truncate decimal values #24819

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