2024308 - Intermittent [TV] browser/modules/test/browser/browser_ReducedProtectionNotification.js | waiting for vsync to be disabled - timed out after 50 tries. - false == true

Status: NEW

(Core :: Privacy: Anti-Tracking, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: smolnar [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=554395140&repo=autoland&task=UH4XhX1bQQ-y3HwOjIYDiQ.0
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/UH4XhX1bQQ-y3HwOjIYDiQ/runs/0/artifacts/public/logs/live_backing.log
Reftest URL: https://hg.mozilla.org/mozilla-central/raw-file/default/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/UH4XhX1bQQ-y3HwOjIYDiQ/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

---

INFO - Console message: [JavaScript Warning: "The resource at “http://trackertest.org/” was blocked because Enhanced Tracking Protection is enabled." {file: "http://tracking.example.org/browser/browser/base/content/test/protectionsUI/trackingPage.html" line: 0}]
[task 2026-03-18T15:15:07.359+00:00] 15:15:07     INFO - Buffered messages logged at 15:14:56
[task 2026-03-18T15:15:07.359+00:00] 15:15:07     INFO - TEST-PASS | browser/modules/test/browser/browser_ReducedProtectionNotification.js | test_pref_gating - No infobar when the feature pref is disabled
[task 2026-03-18T15:15:07.359+00:00] 15:15:07     INFO - Buffered messages logged at 15:14:57
[task 2026-03-18T15:15:07.360+00:00] 15:15:07     INFO - Console message: [JavaScript Warning: "The resource at “http://trackertest.org/” was blocked because Enhanced Tracking Protection is enabled." {file: "http://tracking.example.org/browser/browser/base/content/test/protectionsUI/trackingPage.html" line: 0}]
[task 2026-03-18T15:15:07.361+00:00] 15:15:07     INFO - Leaving test test_pref_gating
[task 2026-03-18T15:15:07.361+00:00] 15:15:07     INFO - Buffered messages finished
[task 2026-03-18T15:15:07.362+00:00] 15:15:07     INFO - TEST-UNEXPECTED-FAIL | browser/modules/test/browser/browser_ReducedProtectionNotification.js | waiting for vsync to be disabled - timed out after 50 tries. - false == true
[task 2026-03-18T15:15:07.362+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:ensureVsyncDisabled:731
[task 2026-03-18T15:15:07.362+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:nextTest:1043
[task 2026-03-18T15:15:07.362+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:testScope/test_finish/<:2096
[task 2026-03-18T15:15:07.362+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:run:2019
[task 2026-03-18T15:15:07.363+00:00] 15:15:07     INFO - Not taking screenshot here: see the one that was previously logged
[task 2026-03-18T15:15:07.364+00:00] 15:15:07     INFO - TEST-UNEXPECTED-FAIL | browser/modules/test/browser/browser_ReducedProtectionNotification.js | vsync remained enabled at the end of the test. Is there an animation still running? Consider talking to the performance team for tips to solve this. - false == true
[task 2026-03-18T15:15:07.364+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:ensureVsyncDisabled:732
[task 2026-03-18T15:15:07.364+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:nextTest:1043
[task 2026-03-18T15:15:07.364+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:testScope/test_finish/<:2096
[task 2026-03-18T15:15:07.364+00:00] 15:15:07     INFO - chrome://mochikit/content/browser-test.js:run:2019
[task 2026-03-18T15:15:07.617+00:00] 15:15:07     INFO - GECKO(1654) | MEMORY STAT | vsize 37411MB | residentFast 313MB | heapAllocated 113MB
[task 2026-03-18T15:15:07.618+00:00] 15:15:07     INFO - checking for open sidebars

Comment 1

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

:manuel, since you are the author of the regressor, bug 1994684, could you take a look?

For more information, please visit BugBot documentation.

Comment 2

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

Set release status flags based on info from the regressing bug 1994684

Comment 3

[Intermittent Failures Robot]

1 failures were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 1

Table

	no_variant
macosx1470-x86_64/opt	1

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=2024308&startday=2026-03-16&endday=2026-03-22&tree=all

Comment 4

[Manuel Bucher [:manuel]]

waiting for vsync to be disabled

seems like an unrelated failure to the test. Also the failure only happened once. I'll take a look if this becomes more common.

Comment 5

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

Set release status flags based on info from the regressing bug 1994684