207944 2020-02-19 09:08:22 -0800 (r256583) [ iOS ] http/tests/resourceLoadStatistics/prevalent-domains-per-page-database.html is a flaky timeout 2020-02-20 15:45:34 -0800 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=207523 InRadar P2 Normal --- 1 tsavell katherine_cheney ap katherine_cheney webkit-bot-watchers-bugzilla webkit-bug-importer oldest_to_newest 1620691 0 tsavell 2020-02-19 09:08:22 -0800 http/tests/resourceLoadStatistics/prevalent-domains-per-page-database.html This test was introduced in https://trac.webkit.org/changeset/256583/webkit and is a flaky timeout sense introduction. there is also at least one crash in history. history: https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2FresourceLoadStatistics%2Fprevalent-domains-per-page-database.html 1620692 1 webkit-bug-importer 2020-02-19 09:08:38 -0800 <rdar://problem/59592361> 1621228 2 391289 katherine_cheney 2020-02-20 08:22:22 -0800 Created attachment 391289 Patch 1621234 3 391289 ap 2020-02-20 08:35:16 -0800 Comment on attachment 391289 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=391289&action=review r=ews > LayoutTests/http/tests/resourceLoadStatistics/prevalent-domains-per-page-database.html:20 > + if (arrayOfDomains.length == 0) { > + askForPrevalentResources(); > + return; This is a tight loop, which is unfriendly to other tests running in parallel. Maybe do it on a 100 ms timer? > LayoutTests/http/tests/resourceLoadStatistics/prevalent-domains-per-page-database.html:25 > testFailed("Domain was not successfully marked prevalent."); Does this become dead code now, as we'll keep retrying until timeout? Maybe it's worth to limit retries to say 20 seconds, because timeout is not a very clear failure mode - we often assume that those are not real failures. 1621236 4 391289 katherine_cheney 2020-02-20 08:40:00 -0800 Comment on attachment 391289 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=391289&action=review >> LayoutTests/http/tests/resourceLoadStatistics/prevalent-domains-per-page-database.html:20 >> + return; > > This is a tight loop, which is unfriendly to other tests running in parallel. Maybe do it on a 100 ms timer? Sounds good, I'll add this. >> LayoutTests/http/tests/resourceLoadStatistics/prevalent-domains-per-page-database.html:25 >> testFailed("Domain was not successfully marked prevalent."); > > Does this become dead code now, as we'll keep retrying until timeout? Maybe it's worth to limit retries to say 20 seconds, because timeout is not a very clear failure mode - we often assume that those are not real failures. Do you have an example of another test which does this? I've only seen retrying for a certain number of iterations, not based on time. 1621270 5 ap 2020-02-20 10:09:55 -0800 Yes, we have some tests with a setTimeout() for 20 seconds that prints a failure message and calls notifyDone(). We also have some that limit the number of iterations, but I don't know if 200 iterations 100 ms each are guaranteed to complete in a time that's close enough to 20 seconds. Probably not. 1621304 6 391310 katherine_cheney 2020-02-20 10:59:56 -0800 Created attachment 391310 Patch 1621305 7 katherine_cheney 2020-02-20 11:00:28 -0800 Letting ews run. 1621454 8 katherine_cheney 2020-02-20 15:37:13 -0800 This test uses UIHelper.activateAt(), which doesn't produce a user gesture that ITP reliably captures on iOS. This is a problem we’ve faced before with ITP tests, and our solution for now is to skip these tests on iOS. 1621457 9 katherine_cheney 2020-02-20 15:45:34 -0800 Committed: https://trac.webkit.org/r257100 391289 2020-02-20 08:22:22 -0800 2020-02-20 10:59:55 -0800 Patch bug-207944-20200220082221.patch text/plain 3693 katherine_cheney U3VidmVyc2lvbiBSZXZpc2lvbjogMjU3MDU1CmRpZmYgLS1naXQgYS9MYXlvdXRUZXN0cy9DaGFu Z2VMb2cgYi9MYXlvdXRUZXN0cy9DaGFuZ2VMb2cKaW5kZXggZTMxYjE1M2Y1M2M3NTM3NTFhNjNl YzM0MWVkOTQ1NDljZjFjODFjNC4uYWE5ZDZkYjFjZGY3ZDRmY2NkOWE1ZjcwMzNiNjU3MDE0ZGNi MGNiYyAxMDA2NDQKLS0tIGEvTGF5b3V0VGVzdHMvQ2hhbmdlTG9nCisrKyBiL0xheW91dFRlc3Rz L0NoYW5nZUxvZwpAQCAtMSwzICsxLDE4IEBACisyMDIwLTAyLTIwICBLYXRlIENoZW5leSAgPGth dGhlcmluZV9jaGVuZXlAYXBwbGUuY29tPgorCisgICAgICAgIChyMjU2NTgzKSBbIGlPUyBdIGh0 dHAvdGVzdHMvcmVzb3VyY2VMb2FkU3RhdGlzdGljcy9wcmV2YWxlbnQtZG9tYWlucy1wZXItcGFn ZS1kYXRhYmFzZS5odG1sIGlzIGEgZmxha3kgdGltZW91dAorICAgICAgICBodHRwczovL2J1Z3Mu 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