Investigate flaky test-http-server-request-timeout-keepalive #42741

richardlau · 2022-04-14T16:48:41Z

Test

test-http-server-request-timeout-keepalive

Platform

FreeBSD, macOS

Console output

17:13:37 not ok 1424 parallel/test-http-server-request-timeout-keepalive
17:13:37   ---
17:13:37   duration_ms: 3.487
17:13:37   severity: fail
17:13:37   exitcode: 1
17:13:37   stack: |-
17:13:37     node:assert:123
17:13:37       throw new AssertionError(obj);
17:13:37       ^
17:13:37     
17:13:37     AssertionError [ERR_ASSERTION]: Expected values to be strictly equal:
17:13:37     + actual - expected
17:13:37     
17:13:37     + 'HTTP/1.1 200 OK\r\n' +
17:13:37     +   'Content-Type: text/plain\r\n' +
17:13:38     +   'Date: Thu, 14 Apr 2022 16:13:37 GMT\r\n' +
17:13:38     +   'Connection: close\r\n' +
17:13:38     +   'Transfer-Encoding: chunked\r\n' +
17:13:38     +   '\r\n' +
17:13:38     +   '0\r\n' +
17:13:38     +   '\r\n'
17:13:38     - ''
17:13:38         at Socket.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd12-x64/test/parallel/test-http-server-request-timeout-keepalive.js:82:12)
17:13:38         at Socket.<anonymous> (/usr/home/iojs/build/workspace/node-test-commit-freebsd/nodes/freebsd12-x64/test/common/index.js:438:15)
17:13:38         at Socket.emit (node:events:539:35)
17:13:38         at endReadableNT (node:internal/streams/readable:1344:12)
17:13:38         at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
17:13:38       generatedMessage: true,
17:13:38       code: 'ERR_ASSERTION',
17:13:38       actual: 'HTTP/1.1 200 OK\r\n' +
17:13:38         'Content-Type: text/plain\r\n' +
17:13:38         'Date: Thu, 14 Apr 2022 16:13:37 GMT\r\n' +
17:13:38         'Connection: close\r\n' +
17:13:38         'Transfer-Encoding: chunked\r\n' +
17:13:38         '\r\n' +
17:13:38         '0\r\n' +
17:13:38         '\r\n',
17:13:38       expected: '',
17:13:38       operator: 'strictEqual'
17:13:38     }
17:13:38     
17:13:38     Node.js v18.0.0-pre
17:13:38   ...

Build links

Additional information

Test was recently updated by #41263.

cc @ShogunPanda

The text was updated successfully, but these errors were encountered:

ShogunPanda · 2022-04-14T17:08:20Z

I will take care of that tomorrow morning.

Out of the box I just have to fine tune timers.

@nodejs/build Can I get access to that BSD machine?

Refs: nodejs#41263 PR-URL: nodejs#42846 Fixes: nodejs#42741 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it>

tniessen · 2022-04-25T15:55:50Z

Looks like #42846 reduced the error rate by some amount but it's still flaky. We can probably further increase the base timeout and see if that helps, even if the test will become unbearably slow.

ShogunPanda · 2022-04-25T15:58:52Z

I have a further change in #42812 which should reduce it even more.
I'd suggest to wait for that to land and see what happens.

Anyway given the success rate is above 99% I think we might think about closing this (since retries in CI are normal) and reopen only if there is consistent failure.

richardlau · 2022-04-25T16:04:12Z

I have a further change in #42812 which should reduce it even more. I'd suggest to wait for that to land and see what happens.

Anyway given the success rate is above 99% I think we might think about closing this (since retries in CI are normal) and reopen only if there is consistent failure.

This issue is tracking that the test is flaky, which it still appears to be so I'm reopening.

tniessen · 2022-04-26T00:04:32Z

It's interesting that it seems to only happen on macOS and FreeBSD. I might run a few stress tests.

tniessen · 2022-04-26T21:48:42Z

Patch (assuming the issue is timing-related):

diff --git a/test/parallel/test-http-server-headers-timeout-keepalive.js b/test/parallel/test-http-server-headers-timeout-keepalive.js
index 05531087ed83..ba82cb0e0c9c 100644
--- a/test/parallel/test-http-server-headers-timeout-keepalive.js
+++ b/test/parallel/test-http-server-headers-timeout-keepalive.js
@@ -24,7 +24,7 @@ function performRequestWithDelay(client, firstDelay, secondDelay, closeAfter) {
   }, firstDelay + secondDelay).unref();
 }
 
-const headersTimeout = common.platformTimeout(2000);
+const headersTimeout = common.platformTimeout(5000);
 const server = createServer({
   headersTimeout,
   requestTimeout: 0,
diff --git a/test/parallel/test-http-server-request-timeout-keepalive.js b/test/parallel/test-http-server-request-timeout-keepalive.js
index 2466e1ee7a95..eb6d64b2f2bb 100644
--- a/test/parallel/test-http-server-request-timeout-keepalive.js
+++ b/test/parallel/test-http-server-request-timeout-keepalive.js
@@ -24,7 +24,7 @@ function performRequestWithDelay(client, firstDelay, secondDelay, closeAfter) {
   }, firstDelay + secondDelay).unref();
 }
 
-const requestTimeout = common.platformTimeout(2000);
+const requestTimeout = common.platformTimeout(5000);
 const server = createServer({
   headersTimeout: 0,
   requestTimeout,

First run (master and with patch):

	osx11	freebsd12-x64
master	`OK: 902 NOT OK: 98 TOTAL: 1000`	`OK: 863 NOT OK: 137 TOTAL: 1000`
increased timeout	`OK: 676 NOT OK: 324 TOTAL: 1000`	`OK: 1000 NOT OK: 0 TOTAL: 1000`

Second run (master and with patch):

	osx11	freebsd12-x64
master	`OK: 910 NOT OK: 90 TOTAL: 1000`	`OK: 819 NOT OK: 181 TOTAL: 1000`
increased timeout	`OK: 713 NOT OK: 287 TOTAL: 1000`	`OK: 1000 NOT OK: 0 TOTAL: 1000`

Unless I'm mistaken, increasing the timeout fixes the issues on FreeBSD but somehow makes it worse on macOS?

I started a third run with fresh revisions because I find this hard to believe (master and with patch).

Update: Third run (master and with patch):

	osx11	freebsd12-x64
master	`OK: 916 NOT OK: 84 TOTAL: 1000`	`OK: 838 NOT OK: 162 TOTAL: 1000`
increased timeout	`OK: 721 NOT OK: 279 TOTAL: 1000`	`OK: 1000 NOT OK: 0 TOTAL: 1000`

tniessen · 2022-04-27T12:13:01Z

Median success rate (refer to patch and separate tables above):

	osx11	freebsd12-x64
master (2000ms)	91.0 %	83.8 %
patched (5000ms)	71.3 %	100 %

ShogunPanda · 2022-04-27T14:12:40Z

@richardlau Thanks, I think one commit closed this by mistake.

ShogunPanda · 2022-04-27T14:13:11Z

@tniessen This is very strange. I code on MacOS and never got a failure...

Refs: #41263 PR-URL: #42846 Fixes: #42741 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it>

tniessen · 2022-04-29T11:20:45Z

@richardlau Based on #42741 (comment), would you be okay with further increasing the timeout to fix the test on FreeBSD and with marking it as flaky on macOS? Do GitHub actions respect our list of flaky tests?

richardlau · 2022-04-29T11:28:29Z

@richardlau Based on #42741 (comment), would you be okay with further increasing the timeout to fix the test on FreeBSD and with marking it as flaky on macOS?

I would be okay increasing the timeout and marking macOS flaky although we'd still keep this open for tracking as we do for other tests marked flaky.

Do GitHub actions respect our list of flaky tests?

They should do:

node/.github/workflows/test-macos.yml

Line 34 in 68fb0bf

FLAKY_TESTS: dontcare

node/Makefile

Lines 526 to 530 in 68fb0bf

    
           test-ci: | clear-stalled bench-addons-build build-addons build-js-native-api-tests build-node-api-tests doc-only 
        
           	out/Release/cctest --gtest_output=xml:out/junit/cctest.xml 
        
           	$(PYTHON) tools/test.py $(PARALLEL_ARGS) -p tap --logfile test.tap \ 
        
           		--mode=$(BUILDTYPE_LOWER) --flaky-tests=$(FLAKY_TESTS) \ 
        
           		$(TEST_CI_ARGS) $(CI_JS_SUITES) $(CI_NATIVE_SUITES) $(CI_DOC)

richardlau · 2022-04-29T11:53:28Z

I've no idea if it's the same underlying cause, but I've just spotted on LinuxONE:
https://ci.nodejs.org/job/node-test-commit-linuxone/31851/nodes=rhel8-s390x/consoleFull

12:30:49 not ok 1273 parallel/test-http-server-request-timeout-keepalive
12:30:49   ---
12:30:49   duration_ms: 6.565
12:30:49   severity: fail
12:30:49   exitcode: 1
12:30:49   stack: |-
12:30:49     Mismatched <anonymous> function calls. Expected exactly 1, actual 2.
12:30:49         at Proxy.mustCall (/home/iojs/build/workspace/node-test-commit-linuxone/test/common/index.js:396:10)
12:30:49         at Server.<anonymous> (/home/iojs/build/workspace/node-test-commit-linuxone/test/parallel/test-http-server-request-timeout-keepalive.js:77:27)
12:30:49         at Server.<anonymous> (/home/iojs/build/workspace/node-test-commit-linuxone/test/common/index.js:438:15)
12:30:49         at Object.onceWrapper (node:events:641:28)
12:30:49         at Server.emit (node:events:527:28)
12:30:49         at emitListeningNT (node:net:1414:10)
12:30:49         at process.processTicksAndRejections (node:internal/process/task_queues:81:21)
12:30:49   ...

ShogunPanda · 2022-04-29T12:50:31Z

I think this might have been an error from me, I have:

client.on('error', errOrEnd);
client.on('end', errOrEnd);

So being called two times is legit if things are not closed fast enough,

ShogunPanda · 2022-04-29T12:52:29Z

Should I mark this test and all tests in #42893 (without raising the timeout)?
They all rely on timers so I think we're gonna hard time guaranteeing they don't fail on slow platforms...

(just to clarify: they pass on most platforms so I don't think we're ignoring a bug)

Refs: nodejs#42741

tniessen · 2022-04-30T13:09:37Z

I would be okay increasing the timeout and marking macOS flaky although we'd still keep this open for tracking as we do for other tests marked flaky.

@richardlau I opened #42962 to mark the two known problematic tests as flaky on macOS. Increasing the timeout seems to fix the FreeBSD failures.

They all rely on timers so I think we're gonna hard time guaranteeing they don't fail on slow platforms...

The strange part is that the error rate seems to increase when the timeout increases (see #42741 (comment)), so I am not sure if macOS being slow is the issue here.

Refs: nodejs#42741

Refs: #42741 PR-URL: #42926 Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

ShogunPanda · 2022-05-03T04:58:30Z

@tniessen You are right. I actually spotted a bug while working on #42812, see changes in https://github.com/nodejs/node/pull/42812/files#diff-bbcf7a115fe4680f3a7c076a487c89bd4ce935e7d2a726cfcb3f69331705e25eR260.

~~Do you mind trying again first with and 2 and then 5 seconds once that lands?~~

Both related PR are now in master. Can you please try again with 2 and/or 5 seconds?

ShogunPanda · 2022-05-06T11:20:07Z

@tniessen Any update on this? Are tests improving?

Refs: #42741 PR-URL: #42926 Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

joyeecheung · 2022-05-12T13:56:55Z

It seems the flake is still there: nodejs/reliability#273

Reason	`parallel/test-http-server-request-timeouts-mixed`
Type	JS_TEST_FAILURE
Failed PR	13 (#42960, #42963, #42623, #42968, #42867, #37769, #42423, #42601, #43005, #42970, #43036, #42725, #43023)
Appeared	test-orka-macos10.15-x64-1, test-macstadium-macos11.0-arm64-3, test-orka-macos11-x64-2, test-nearform-macos10.15-x64-1, test-orka-macos11-x64-1
First CI	https://ci.nodejs.org/job/node-test-pull-request/43865/
Last CI	https://ci.nodejs.org/job/node-test-pull-request/43960/

Example

not ok 1166 parallel/test-http-server-request-timeouts-mixed
  ---
  duration_ms: 3.255
  severity: fail
  exitcode: 1
  stack: |-
    node:assert:399
        throw err;
        ^
    
    AssertionError [ERR_ASSERTION]: The expression evaluated to a falsy value:
    
      assert(request2.completed)
    
        at Timeout._onTimeout (/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1015/test/parallel/test-http-server-request-timeouts-mixed.js:106:5)
        at listOnTimeout (node:internal/timers:564:17)
        at process.processTimers (node:internal/timers:507:7) {
      generatedMessage: true,
      code: 'ERR_ASSERTION',
      actual: false,
      expected: true,
      operator: '=='
    }
    
    Node.js v19.0.0-pre
  ...

Refs: #41263 PR-URL: #42846 Fixes: #42741 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com> Reviewed-By: Darshan Sen <raisinten@gmail.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it>

LiviaMedeiros · 2022-06-28T16:44:50Z

I just comprehended what had happened here.
The issue was mistakenly closed by cross-connection via pushing in another repository a commit having Fixes: reference.
The push contained up to 567 latest commits (starting from 2022-04-01) from node repository, rebased on top of test commits.

Checking with curl https://api.github.com/users/LiviaMedeiros/events?per_page=100 | jq '.[]|select(.type=="IssuesEvent")' confirmed that only this issue was affected.

I deeply apologize for this embarassing incident. In the future, I'll keep anything like that on a separate GitHub account.
Please let me know if there are other side effects or something to undo.

@aduh95 thanks for reopening this.
Pinging you as a TSC member (if I made a mistake is applicable).

targos · 2022-09-28T07:41:57Z

I got a failure in #44741 (comment)

aduh95 · 2024-06-17T08:13:34Z

Getting some failures again on osx11 ([test-http-server-request-timeouts-mixed](https://ci.nodejs.org/job/node-test-pull-request/59813/, https://ci.nodejs.org/job/node-test-pull-request/59820/)

richardlau added the flaky-test Issues and PRs related to the tests with unstable failures on the CI. label Apr 14, 2022

BethGriggs mentioned this issue Apr 14, 2022

test: delete test/pummel/test-repl-empty-maybelocal-crash.js #42720

Closed

This was referenced Apr 15, 2022

Access to @ShogunPanda to freebsd12-x64 test VM nodejs/build#2929

Closed

http: added closeAllConnections and closeIdleConnections to http.server #42812

Closed

tniessen mentioned this issue Apr 24, 2022

test: fix flaky HTTP server tests #42846

Merged

nodejs-github-bot closed this as completed in #42846 Apr 24, 2022

richardlau reopened this Apr 25, 2022

ShogunPanda closed this as completed Apr 27, 2022

richardlau reopened this Apr 27, 2022

bnoordhuis mentioned this issue Apr 27, 2022

loop: better align order-of-events behavior between platforms libuv/libuv#3598

Merged

tniessen added a commit to tniessen/node that referenced this issue Apr 30, 2022

test: reduce impact of flaky HTTP server tests

35014d7

Refs: nodejs#42741

tniessen mentioned this issue Apr 30, 2022

test: reduce impact of flaky HTTP server tests #42926

Merged

tniessen mentioned this issue Apr 30, 2022

crypto: clean up parameter validation in HKDF #42924

Merged

tniessen added a commit to tniessen/node that referenced this issue Apr 30, 2022

test: reduce impact of flaky HTTP server tests

06c1abe

Refs: nodejs#42741

LiviaMedeiros closed this as completed Jun 28, 2022

aduh95 reopened this Jun 28, 2022

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Investigate flaky test-http-server-request-timeout-keepalive #42741

Investigate flaky test-http-server-request-timeout-keepalive #42741

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Investigate flaky test-http-server-request-timeout-keepalive #42741

Investigate flaky test-http-server-request-timeout-keepalive #42741

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richardlau commented Apr 14, 2022

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