1966348 - Perma [tier 2] gfx/layers/apz/test/mochitest/test_group_overscroll_handoff.html | Test timed out. - | single tracking bug

Status: RESOLVED FIXED

(Core :: Panning and Zooming, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: chorotan [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer?job_id=508144472&repo=mozilla-central
Full log: https://firefox-ci-tc.services.mozilla.com/api/queue/v1/task/cBeXGqV4ReS3iAG199G-FQ/runs/0/artifacts/public/logs/live_backing.log

---

task 2025-05-14T10:16:27.014Z] 10:16:27     INFO - TEST-PASS | gfx/layers/apz/test/mochitest/test_group_overscroll_handoff.html | Starting subtest helper_position_fixed_scroll_handoff-5.html 
[task 2025-05-14T10:16:27.014Z] 10:16:27     INFO - must wait for load
[task 2025-05-14T10:16:27.014Z] 10:16:27     INFO - helper_position_fixed_scroll_handoff-5.html | start scroll #1
[task 2025-05-14T10:16:27.015Z] 10:16:27     INFO - helper_position_fixed_scroll_handoff-5.html | After scroll #1: fixed=712 subdoc window=0 window=0
[task 2025-05-14T10:16:27.015Z] 10:16:27     INFO - helper_position_fixed_scroll_handoff-5.html | wait scroll #1
[task 2025-05-14T10:16:27.015Z] 10:16:27     INFO - helper_position_fixed_scroll_handoff-5.html | start scroll #2
[task 2025-05-14T10:16:27.016Z] 10:16:27     INFO - Buffered messages finished
[task 2025-05-14T10:16:27.016Z] 10:16:27     INFO - TEST-UNEXPECTED-FAIL | gfx/layers/apz/test/mochitest/test_group_overscroll_handoff.html | Test timed out. - 
[task 2025-05-14T10:16:27.887Z] 10:16:27     INFO - GECKO(4843) | MEMORY STAT | vsize 2680MB | residentFast 175MB | heapAllocated 12MB
[task 2025-05-14T10:16:31.915Z] 10:16:31     INFO - Error: Unable to restore focus, expect failures and timeouts.
[task 2025-05-14T10:16:31.945Z] 10:16:31     INFO - TEST-OK | gfx/layers/apz/test/mochitest/test_group_overscroll_handoff.html | took 331474ms
[task 2025-05-14T10:16:32.049Z] 10:16:32     INFO - TEST-START | gfx/layers/apz/test/mochitest/test_group_paint_skip.html
[task 2025-05-14T10:16:35.563Z] 10:16:35     INFO - GECKO(4843) | helper_paint_skip_instant_absolute_scroll_position_update.html | WaitUntilApzStable: done promiseFocus
[task 2025-05-14T10:16:35.620Z] 10:16:35     INFO - GECKO(4843) | helper_paint_skip_instant_absolute_scroll_position_update.html | WaitUntilApzStable: done promiseAllPaintsDone
[task 2025-05-14T10:16:35.622Z] 10:16:35     INFO - GECKO(4843) | helper_paint_skip_instant_absolute_scroll_position_update.html | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2025-05-14T10:16:35.657Z] 10:16:35     INFO - GECKO(4843) | helper_paint_skip_instant_absolute_scroll_position_update.html | PromiseApzRepaintsFlushed: APZ flush done
[task 2025-05-14T10:16:35.659Z] 10:16:35     INFO - GECKO(4843) | helper_paint_skip_instant_absolute_scroll_position_update.html | WaitUntilApzStable: all done
[task 2025-05-14T10:16:35.682Z] 10:16:35     INFO - GECKO(4843) | helper_paint_skip_instant_absolute_scroll_position_update.html | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2025-05-14T10:16:35.692Z] 10:16:35     INFO - GECKO(4843) | helper_paint_skip_instant_absolute_scroll_position_update.html | PromiseApzRepaintsFlushed: APZ flush done
[task 2025-05-14T10:16:36.127Z] 10:16:36     INFO - GECKO(4843) | helper_paint_skip_instant_relative_scroll_position_update.html | WaitUntilApzStable: done promiseFocus
[task 2025-05-14T10:16:36.171Z] 10:16:36     INFO - GECKO(4843) | helper_paint_skip_instant_relative_scroll_position_update.html | WaitUntilApzStable: done promiseAllPaintsDone
[task 2025-05-14T10:16:36.182Z] 10:16:36     INFO - GECKO(4843) | helper_paint_skip_instant_relative_scroll_position_update.html | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2025-05-14T10:16:36.393Z] 10:16:36     INFO - GECKO(4843) | helper_paint_skip_instant_relative_scroll_position_update.html | PromiseApzRepaintsFlushed: APZ flush done
[task 2025-05-14T10:16:36.393Z] 10:16:36     INFO - GECKO(4843) | helper_paint_skip_instant_relative_scroll_position_update.html | WaitUntilApzStable: all done
[task 2025-05-14T10:16:36.407Z] 10:16:36     INFO - GECKO(4843) | helper_paint_skip_instant_relative_scroll_position_update.html | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2025-05-14T10:16:36.417Z] 10:16:36     INFO - GECKO(4843) | helper_paint_skip_instant_relative_scroll_position_update.html | PromiseApzRepaintsFlushed: APZ flush done
[task 2025-05-14T10:16:36.845Z] 10:16:36     INFO - GECKO(4843) | helper_first_paint_instant_relative_scroll_position_update.html | WaitUntilApzStable: done promiseFocus
[task 2025-05-14T10:16:36.884Z] 10:16:36     INFO - GECKO(4843) | helper_first_paint_instant_relative_scroll_position_update.html | WaitUntilApzStable: done promiseAllPaintsDone
[task 2025-05-14T10:16:36.887Z] 10:16:36     INFO - GECKO(4843) | helper_first_paint_instant_relative_scroll_position_update.html | PromiseApzRepaintsFlushed: Flushed APZ repaints, waiting for callback...
[task 2025-05-14T10:16:36.914Z] 10:16:36     INFO - GECKO(4843) | helper_first_paint_instant_relative_scroll_position_update.html | PromiseApzRepaintsFlushed: APZ flush done
[task 2025-05-14T10:16:36.915Z] 10:16:36     INFO - GECKO(4843) | helper_first_paint_instant_relative_scroll_position_update.html | WaitUntilApzStable: all done
[task 2025-05-14T10:16:36.951Z] 10:16:36     INFO - GECKO(4843) | MEMORY STAT | vsize 2685MB | residentFast 184MB | heapAllocated 16MB

Comment 1

[Cristina Horotan [:chorotan]]

Started with this merge

Comment 2

[Botond Ballo [:botond]]

(In reply to Cristina Horotan [:chorotan] from comment #1)

Started with this merge

Bug 1961722 in that range seems suspicious, given that it's changing a codepath related to scroll handoff

Comment 3

[Timothy Nikkel (:tnikkel)]

Okay, feel free to back out bug 1961722 then, either it'll fix the issue or not, either way we will have learned more.

Comment 4

[Timothy Nikkel (:tnikkel)]

I did try runs, it does seem to be because of bug 1961722.

Comment 5

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

Set release status flags based on info from the regressing bug 1961722

Comment 6

[Timothy Nikkel (:tnikkel)]

We are failing helper_position_fixed_scroll_handoff-5.html, which has is testing scroll handoff in a scrollframe that is in a fixed div in an iframe. It is testing that scroll hands off from inside that fixed div to the root scroll frame of that document. The job type has fission disabled, which means that we do not set displayports on every scroll frame that wants them. So I would guess that when we call SetZeroMarginDisplayPortOnAsyncScrollableAncestors for the scroll frame inside the fixed div, the patch for bug 1961722 makes us walk the parent frame, so it goes to the fixed div, to the root frame and then to the parent doc. Before bug 1961722, it would walk from the fixed div to the placeholder for it, which would then eventually find the root scroll frame of the subdoc. So we probably need to make SetZeroMarginDisplayPortOnAsyncScrollableAncestors do the same kind of thing that GetAsyncScrollableAncestorFrame does when it passes the SCROLLABLE_FIXEDPOS_FINDS_ROOT flag to GetNearestScrollContainerFrame. And then audit any similar loops to see if they have a similar problem.

Comment 7

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

:tnikkel, since you are the author of the regressor, bug 1961722, could you take a look?

For more information, please visit BugBot documentation.

Comment 8

[Intermittent Failures Robot]

37 failures were associated with this bug in the last 7 days.
This is the #46 most frequent failure this week.

This failure happened more than 30 times this week! Resolving this bug is a high priority.

Try to resolve this bug as soon as possible. If unresolved for 2 weeks, the affected test(s) may be disabled.

Repository breakdown:

• mozilla-central: 37

Table

	nofis
linux1804-x86_64/asan	11
linux1804-x86_64/debug	13
linux1804-x86_64/opt	13

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1966348&startday=2025-05-12&endday=2025-05-18&tree=all

Comment 9

[Timothy Nikkel (:tnikkel)]

Attachment: Bug 1966348. When walking the async scrollable ancestor chain make sure to walk from fixed position to root scroll frame. r?botond,hiro,dlrobertson

This is what GetAsyncScrollableAncestorFrame does.

Comment 10

[Donal Meehan [:dmeehan]]

Settng Fx140 to fixed since the regressor, Bug 1961722, was backed out

Comment 11

[Intermittent Failures Robot]

43 failures were associated with this bug in the last 7 days.
This is the #26 most frequent failure this week.

This failure happened more than 30 times this week! Resolving this bug is a high priority.

Try to resolve this bug as soon as possible. If unresolved for 2 weeks, the affected test(s) may be disabled.

Repository breakdown:

• mozilla-central: 42
• try: 1

Table

	nofis
linux1804-x86_64/asan	15
linux1804-x86_64/debug	14
linux1804-x86_64/opt	14

For more details, see:

https://treeherder.mozilla.org/intermittent-failures/bugdetails?bug=1966348&startday=2025-05-19&endday=2025-05-25&tree=all

Comment 12

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/49ffec9bf371
When walking the async scrollable ancestor chain make sure to walk from fixed position to root scroll frame. r=botond

Comment 13

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/49ffec9bf371