Closed Bug 1849253 Opened 11 months ago Closed 8 months ago

Intermittent /css/css-contain/content-visibility/content-visibility-resize-observer-no-error.html | single tracking bug

Categories

(Core :: Layout, defect, P5)

defect

Tracking

()

RESOLVED DUPLICATE of bug 1807253

People

(Reporter: intermittent-bug-filer, Unassigned)

References

(Blocks 1 open bug)

Details

(Keywords: intermittent-failure, intermittent-testcase)

Filed by: dholbert [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=426306026&repo=try
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/Ny-0CHoHQXWLLddOgMJHBQ/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/Ny-0CHoHQXWLLddOgMJHBQ/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1


I ran into this on a try run, which had zero changes to Gecko itself and zero changes to this particular test.  Treeherder doesn't have any suggested matches, so I'm assuming this is a latent intermittent failure that I just got lucky enough to be the first one to notice.

In the reftest failure analyzer, the screenshot of the testcase shows a 400px tall blue area, while the screenshot of the reference case shows a 100px tall blue area.

I can briefly see the 400px-tall-blue-area rendering, when I load (or shift+reload) the test directly, e.g. at http://wpt.live/css/css-contain/content-visibility/content-visibility-resize-observer-no-error.html

(Really, the 400px tall area is two 200px-divs.)

It looks like we're doing an initial paint of the page with the contain-intrinsic-size-granted heights on these divs, which we perhaps should not be doing...? That's what's creating an opportunity for the reftest snapshot to capture this initial unexpectedly-tall rendering.

I have tried with the command from bug 1865267 comment 12 and cannot reproduce.

We don't have any annotation in content-visibility-resize-observer-no-error.html.ini and it looks the last report was on 2023-08-17 for linux1804-64-qr opt. It's possible this has been fixed by recent changes.

(In reply to Treeherder Bug Filer from comment #0)

I ran into this on a try run, which had zero changes to Gecko itself and zero changes to this particular test. Treeherder doesn't have any suggested matches, so I'm assuming this is a latent intermittent failure that I just got lucky enough to be the first one to notice.

@Daniel: Are you still able to reproduce? Otherwise, I guess we can close?

Flags: needinfo?(dholbert)

Comment 0 was just a one-off on Try; I'm not sure how reproducible that would be. Apparently not very reproducible since we only ever got that one report of an actual test-failure, it seems.

But the thing I described in comment 2 (flicker of taller blue content at page-load): I can still reproduce that in older builds, but it's gone away in newer builds. Fix range:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=9ea04a2cc829da8ce1048f38bb015b869d9273aa&tochange=95679f6ce2544b21ec9cfd0d19961058d60155d6
--> Looks like we can consider this a duplicate of bug 1807253. Thanks!

Status: NEW → RESOLVED
Closed: 8 months ago
Duplicate of bug: 1807253
Flags: needinfo?(dholbert)
Resolution: --- → DUPLICATE
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