Bug 208889 – REGRESSION: [ Mac wk2 ] fast/images/decode-render-animated-image.html is flaky failing

• Status: NEW
• Component: Images

[Jason Lawrence]

Created attachment 393183 [details]
decode-render-animated-image-diff

fast/images/decode-render-animated-image.html

Description:
This test is flaky failing on Mac wk2. There appears to be a regression point at r257944.

History:
https://results.webkit.org/?suite=layout-tests&test=fast%2Fimages%2Fdecode-render-animated-image.html&platform=mac

Diff:
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK2%20(Tests)/r258226%20(11064)/fast/images/decode-render-animated-image-diffs.html

[Radar WebKit Bug Importer]

<rdar://problem/60294431>

[Jason Lawrence]

I have marked this test as failing while this issue is investigated.
https://trac.webkit.org/changeset/258234/webkit

[Alexey Proskuryakov]

This cannot be r257944, which didn't change any code. I see the first failure on internal bots with r257872, and one of the bots started to flaky time out with the first timeout on r257830. But this isn't frequent enough to positively blame.

[Jason Lawrence]

This issue appears to have regressed at r258002. I can reproduce this issue with r258259 and r258002 using the command below, but cannot reproduce the issue with r258002 or r257998.

run-webkit-tests --iterations 1000 --exit-after-n-failures 3 --force -f —clobber-old-results fast/images/decode-render-animated-image.html

r258259:
[12/1000] fast/images/decode-render-animated-image.html failed unexpectedly (reference mismatch)
[78/1000] fast/images/decode-render-animated-image.html failed unexpectedly (reference mismatch)
998 tests ran as expected, 2 didn't:

r258002:
[47/1000] fast/images/decode-render-animated-image.html failed unexpectedly (reference mismatch)
999 tests ran as expected, 1 didn't:

r258001:
All 1000 tests ran as expected.

r257998:
All 1000 tests ran as expected.

[Jason Lawrence]

It doesn't look like this commit could have caused the issue. I will keep testing.