238580 2022-03-30 16:23:31 -0700 REGRESSION(r292072): [ Mac iOS ] http/tests/webAPIStatistics/canvas-read-and-write-data-collection.html is a constant text failure 2022-04-01 21:34:32 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED CONFIGURATION CHANGED https://bugs.webkit.org/show_bug.cgi?id=238641 InRadar P2 Normal --- 1 Morningstar mmaxfield jenner mmaxfield ntim webkit-bot-watchers-bugzilla webkit-bug-importer oldest_to_newest 1856601 0 Morningstar 2022-03-30 16:23:31 -0700 http/tests/webAPIStatistics/canvas-read-and-write-data-collection.html Is a flaky text failure on Mac and iOS Suspected regression point is r292072. run-webkit-tests http/tests/webAPIStatistics/canvas-read-and-write-data-collection.html --iterations 100 Reveals that this text failure only happens on the first iteration. Issue does not reproduce at r292069. HISTORY: https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2FwebAPIStatistics%2Fcanvas-read-and-write-data-collection.html DIFF: --- /Volumes/Data/worker/ios-simulator-15-release-gpuprocess-tests-wk2/build/layout-test-results/http/tests/webAPIStatistics/canvas-read-and-write-data-collection-expected.txt +++ /Volumes/Data/worker/ios-simulator-15-release-gpuprocess-tests-wk2/build/layout-test-results/http/tests/webAPIStatistics/canvas-read-and-write-data-collection-actual.txt @@ -9,3 +9,11 @@ isPrevalentResource: No isVeryPrevalentResource: No dataRecordsRemoved: 0 +Registrable domain: nullOrigin + hadUserInteraction: No + mostRecentUserInteraction: -1 + grandfathered: No + IsScheduledForAllButCookieDataRemoval: No + isPrevalentResource: No + isVeryPrevalentResource: No + dataRecordsRemoved: 0 DIFF-URL: https://build.webkit.org/results/Apple-iOS-15-Simulator-Release-GPUProcess-WK2-Tests/r292075%20(697)/http/tests/webAPIStatistics/canvas-read-and-write-data-collection-diff.txt 1856602 1 webkit-bug-importer 2022-03-30 16:24:00 -0700 <rdar://problem/91073081> 1856979 2 jenner 2022-03-31 14:28:51 -0700 Marked expectations for test here: https://commits.webkit.org/249082@main 1857297 3 ryanhaddad 2022-04-01 10:23:03 -0700 Fixed test expectations for macOS in https://commits.webkit.org/249127@main 1857452 4 mmaxfield 2022-04-01 16:53:55 -0700 Reverting r292072 makes this test pass again. 1857457 5 ryanhaddad 2022-04-01 17:28:29 -0700 It looks like disabling this test for EWS (since flaky/failing tests are skipped) has caused the failure to move to a different webAPIStatistics test: https://ews-build.s3-us-west-2.amazonaws.com/Commit-Queue/456407-21304/results.html 1857466 6 ryanhaddad 2022-04-01 17:44:58 -0700 Resolved by revert via https://bugs.webkit.org/show_bug.cgi?id=238690 Removed expectations in https://commits.webkit.org/249144@main 1857504 7 mmaxfield 2022-04-01 20:01:24 -0700 I understand what's happening now: 1. InjectedBundle::initialize() runs, which calls activateFonts() (which installs WebKit's testing fonts for the local (web) process. This queues up a notification (which is asynchronously delivered). 2. WebProcess::createWebPage() runs, which loads a dummy empty page, which uses -webkit-standard, and so we end up calling realizeNextFallback() and therefore WebResourceLoadObserver::logFontLoad(). This populates some dummy statistics in the WebResourceLoadObserver under the domain "nullOrigin". 3. InjectedBundle::beginTesting() runs, which calls WebResourceLoadObserver::clearState(). The previously-recorded statistics are now gone. 4. The pending notification gets delivered. The page is still the dummy page. The style recalc ends up calling realizeNextFallback() and therefore WebResourceLoadObserver::logFontLoad(). This populates some more dummy statistics in the WebResourceLoadObserver under the domain "nullOrigin". Before r292072 this didn't use to happen. 5. The test runs, loads some stuff, and dumps the contents of the WebResourceLoadObserver. The contents contain both statistics that the test intentionally created, as well as the dummy statistics that was placed there by the layout the notification caused. 1857505 8 mmaxfield 2022-04-01 20:02:10 -0700 Reopening because there is work to do to make the test work properly. 1857506 9 mmaxfield 2022-04-01 20:03:26 -0700 One thing to realize from the above story is that this problem only occurs during testing. Real users wouldn't actually encounter this problem. 1857522 10 456438 mmaxfield 2022-04-01 20:46:08 -0700 Created attachment 456438 Patch 1857531 11 456442 mmaxfield 2022-04-01 21:24:38 -0700 Created attachment 456442 Patch 1857533 12 mmaxfield 2022-04-01 21:34:26 -0700 Putting back in config changed, so I can continue this in https://bugs.webkit.org/show_bug.cgi?id=238483 456438 2022-04-01 20:46:08 -0700 2022-04-01 21:24:36 -0700 Patch bug-238580-20220401204607.patch text/plain 5578 mmaxfield U3VidmVyc2lvbiBSZXZpc2lvbjogMjkyMjMyCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggM2ViMDY5ZGMxM2EwZmFm MjZkODUzNzM0YmMwM2ZmZGRjZjZlZjRmOS4uNzBiNWZmZTIxMGVlN2I2ODYyODEyNmI0NTc2YWVh YWQ4ZmI3MzU4MCAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI1IEBACisyMDIyLTA0LTAxICBNeWxl cyBDLiBNYXhmaWVsZCAgPG1tYXhmaWVsZEBhcHBsZS5jb20+CisKKyAgICAgICAgUkVHUkVTU0lP 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