1517401 - Intermittent margin-collapsing/block-min-height-last-child-9a.html == margin-collapsing/block-min-height-last-child-9-ref.html | image comparison, max difference: 4, number of differing pixels: 2

Status: RESOLVED INVALID

(Core :: Layout: Block and Inline, defect, P5)

Description

[Treeherder Bug Filer]

Filed by: ncsoregi [at] mozilla.com

https://treeherder.mozilla.org/logviewer.html#?job_id=219718814&repo=mozilla-inbound

https://queue.taskcluster.net/v1/task/GQY9oWHLQ0Of9b57U6vVEg/runs/0/artifacts/public/logs/live_backing.log

https://hg.mozilla.org/mozilla-central/raw-file/tip/layout/tools/reftest/reftest-analyzer.xhtml#logurl=https://queue.taskcluster.net/v1/task/GQY9oWHLQ0Of9b57U6vVEg/runs/0/artifacts/public/logs/live_backing.log&only_show_unexpected=1

Comment 1

[Daniel Holbert [:dholbert]]

The failures show 2 mismatching pixels, on the top middle-right edge of the blue area.  In the testcase snapshot, these pixels have 251 in their blue color-channel, instead of 255 like all the other solid-blue pixels.

There's no rational reason for these pixels to differ, in the HTML source -- there aren't any no antialiased characters or special content placed at that middle-right area or anything.

Source, for reference:
https://searchfox.org/mozilla-central/source/layout/reftests/margin-collapsing/block-min-height-last-child-9a.html
https://searchfox.org/mozilla-central/source/layout/reftests/margin-collapsing/block-min-height-last-child-9b-dyn.html

So I'm pretty sure this looks like bad RAM.  Please reopen if this reoccurs though.

Comment 2

[Intermittent Failures Robot]

1 failures in 1668 pushes (0.001 failures/push) were associated with this bug in the last 7 days.

Repository breakdown:
* mozilla-inbound: 1

Platform breakdown:
* windows7-32: 1

For more details, see:
https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1517401&startday=2018-12-31&endday=2019-01-06&tree=all