1586086 - Intermittent first-letter/font-text-styles.html == first-letter/font-text-styles-ref.html | image comparison, max difference: 255, number of differing pixels: 4032

Status: RESOLVED INCOMPLETE

(Core :: Layout: Text and Fonts, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: aiakab [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=269661008&repo=autoland
Full log: https://queue.taskcluster.net/v1/task/QnJu_I_8Rp2qMBMJ28xsYQ/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://queue.taskcluster.net/v1/task/QnJu_I_8Rp2qMBMJ28xsYQ/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

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[task 2019-10-03T18:57:21.060Z] 18:57:21 INFO - REFTEST TEST-END | http://10.0.2.2:8854/tests/layout/reftests/first-letter/958249.html == http://10.0.2.2:8854/tests/layout/reftests/first-letter/958249-ref.html
[task 2019-10-03T18:57:21.060Z] 18:57:21 INFO - REFTEST TEST-START | http://10.0.2.2:8854/tests/layout/reftests/first-letter/font-text-styles.html == http://10.0.2.2:8854/tests/layout/reftests/first-letter/font-text-styles-ref.html
[task 2019-10-03T18:57:21.060Z] 18:57:21 INFO - REFTEST TEST-LOAD | http://10.0.2.2:8854/tests/layout/reftests/first-letter/font-text-styles.html | 443 / 7931 (5%)
[task 2019-10-03T18:57:21.060Z] 18:57:21 INFO - REFTEST TEST-LOAD | http://10.0.2.2:8854/tests/layout/reftests/first-letter/font-text-styles-ref.html | 443 / 7931 (5%)
[task 2019-10-03T18:57:21.062Z] 18:57:21 INFO - REFTEST TEST-UNEXPECTED-FAIL | http://10.0.2.2:8854/tests/layout/reftests/first-letter/font-text-styles.html == http://10.0.2.2:8854/tests/layout/reftests/first-letter/font-text-styles-ref.html | image comparison, max difference: 255, number of differing pixels: 4032
[task 2019-10-03T18:57:21.080Z] 18:57:21 INFO - REFTEST IMAGE 1 (TEST):

Comment 1

[Daniel Holbert [:dholbert]]

Unfortunately the reftest image is truncated so we can't see the failure in reftest-analyzer, but I'll attach the two screenshots (taken from reftest_raw.log).

In both the testcase and reference case screenshots, it looks like we've got the wrong character offsets, which feels like bug 1585643.

Additionally, in the reference case screenshot, "gonzo macadamia" is all on one line (with no visible space character), whereas in the testcase screenshot it's wrapped to two lines. This feels like another outcome from having improper character width measurements, so likely all part of the same issue.

Comment 2

[Daniel Holbert [:dholbert]]

Attachment: screenshot of testcase (from reftest_raw.log)

Comment 3

[Daniel Holbert [:dholbert]]

Attachment: screenshot of reference case (from reftest_raw.log)

Comment 4

[Intermittent Failures Robot]

2 failures in 4292 pushes (0.0 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:

• autoland: 2

Platform breakdown:

• android-em-7-0-x86_64: 2

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1586086&startday=2019-09-30&endday=2019-10-06&tree=all

Comment 5

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

https://wiki.mozilla.org/Bug_Triage#Intermittent_Test_Failure_Cleanup
For more information, please visit auto_nag documentation.