1710803 - Intermittent [tier2] dom/ipc/tests/browser_gc_schedule.js | GC can begin on tab 1 - Got +0, expected null

Status: RESOLVED FIXED

(Core :: DOM: Content Processes, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: dluca [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=339472581&repo=autoland
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/fUtOsM_MTc2LNyGmoQE-JA/runs/0/artifacts/public/logs/live_backing.log
Reftest URL: https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/fUtOsM_MTc2LNyGmoQE-JA/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

---

INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | Unsorted events, last: 1620804474478, this: 1620804474540 - 
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - Buffered messages finished
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - TEST-UNEXPECTED-FAIL | dom/ipc/tests/browser_gc_schedule.js | GC can begin on tab 1 - Got +0, expected null
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - Stack trace:
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - chrome://mochikit/content/browser-test.js:test_is:1362
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - chrome://mochitests/content/browser/dom/ipc/tests/browser_gc_schedule.js:checkOneAtATime:107
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - chrome://mochitests/content/browser/dom/ipc/tests/browser_gc_schedule.js:gcAbort:251
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | event.state is good - 
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | event.tab exists - 
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | Unsorted events, last: 1620804474540, this: 1620804474577 - 
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-05-12T07:27:54.737Z] 07:27:54     INFO - TEST-UNEXPECTED-FAIL | dom/ipc/tests/browser_gc_schedule.js | GC can end on tab 0 - Got +0, expected 1
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - Stack trace:
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - chrome://mochikit/content/browser-test.js:test_is:1362
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - chrome://mochitests/content/browser/dom/ipc/tests/browser_gc_schedule.js:checkOneAtATime:110
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - chrome://mochitests/content/browser/dom/ipc/tests/browser_gc_schedule.js:gcAbort:251
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | event.state is good - 
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | event.tab exists - 
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | Unsorted events, last: 1620804474577, this: 1620804474589 - 
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - Not taking screenshot here: see the one that was previously logged
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - TEST-UNEXPECTED-FAIL | dom/ipc/tests/browser_gc_schedule.js | GC can end on tab 1 - Got 1, expected null
[task 2021-05-12T07:27:54.738Z] 07:27:54     INFO - Stack trace:
[task 2021-05-12T07:27:54.739Z] 07:27:54     INFO - chrome://mochikit/content/browser-test.js:test_is:1362
[task 2021-05-12T07:27:54.739Z] 07:27:54     INFO - chrome://mochitests/content/browser/dom/ipc/tests/browser_gc_schedule.js:checkOneAtATime:110
[task 2021-05-12T07:27:54.739Z] 07:27:54     INFO - chrome://mochitests/content/browser/dom/ipc/tests/browser_gc_schedule.js:gcAbort:251
[task 2021-05-12T07:27:54.739Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | No GC left running - 
[task 2021-05-12T07:27:54.739Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | Tab 0 did a GC - 
[task 2021-05-12T07:27:54.739Z] 07:27:54     INFO - TEST-PASS | dom/ipc/tests/browser_gc_schedule.js | Tab 1 did a GC - 
[task 2021-05-12T07:27:54.739Z] 07:27:54     INFO - Leaving test bound gcAbort```

Comment 1

[Andrew McCreight (out of office until 8/21) [:mccr8]]

Paul, you should keep an eye on this in case the failure rate is too high. I'm assuming this is a test added for your patch.

Comment 2

[Paul Bone [:pbone]]

Yes, this is a test I've added.

This is failing on "Windows 10 x64 WebRender debug test-windows10-64-qr/debug-test-verify-fis-e10s". What does "verify" mean here? why is this tier 2? I want to figure out if there's something about how the browser is run here that causes my test to fail, I was never able to make it fail when running locally or on try.

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1629064

Comment 4

[Andrew McCreight (out of office until 8/21) [:mccr8]]

(In reply to Paul Bone [:pbone] from comment #2)

This is failing on "Windows 10 x64 WebRender debug test-windows10-64-qr/debug-test-verify-fis-e10s". What does "verify" mean here? why is this tier 2? I want to figure out if there's something about how the browser is run here that causes my test to fail, I was never able to make it fail when running locally or on try.

"Verify mode" runs the test over and over again, by itself, in a variety of configurations including with chaos mode. You can run it locally like this with --verify.

Comment 5

[Andrew McCreight (out of office until 8/21) [:mccr8]]

If you dig through the logs, you might be able to figure out which specific part of the verify process was running when it failed.

Comment 6

[Paul Bone [:pbone]]

Attachment: Bug 1710803 - Skip browser_gc_schedule.js for verify mode r=mccr8

I don't think the intermittent failures here are an indication of a true
problem here, more of a problem with how it's possible to test this code.

Comment 7

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/b41eb6f293c5
Skip browser_gc_schedule.js for verify mode r=mccr8 DONTBUILD

Comment 8

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/b41eb6f293c5