[Webkit-unassigned] [Bug 215829] New: [ iOS Release ] imported/w3c/web-platform-tests/* is flaky failing 200+ tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215829

            Bug ID: 215829
           Summary: [ iOS Release ] imported/w3c/web-platform-tests/* is
                    flaky failing 200+ tests
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hector_i_lopez at apple.com

imported/w3c/web-platform-tests/*

A large group of these tests are flaky failing as a group on Apple iOS 13 Simulator Release WK2(Tests) and Apple iPadOS 13 Simulator Release WK2(Tests) bots. The group number is different every time but is consistently around 200 tests. No failures to APIs accompany these failures. Occurrence is happening on average 1 in 20 builds. Revisions may build successfully on one set of testers but fail on the other group. Almost in every instance the group failures will not happen again on immediate build with no indication that revision was used to clear failures. 

One commonality that all builds on each tester is this warning:
(view as text)
warning: (x86_64) /Volumes/Data/slave/ios-simulator-13-release/build/WebKitBuild/ImageDiff.build/Release/ImageDiff.build/Objects-normal/x86_64/ImageDiff.o unable to open object file: No such file or directory
warning: (x86_64) /Volumes/Data/slave/ios-simulator-13-release/build/WebKitBuild/ImageDiff.build/Release/ImageDiff.build/Objects-normal/x86_64/PlatformImage.o unable to open object file: No such file or directory
warning: (x86_64) /Volumes/Data/slave/ios-simulator-13-release/build/WebKitBuild/ImageDiff.build/Release/ImageDiff.build/Objects-normal/x86_64/PlatformImageCG.o unable to open object file: No such file or directory
warning: no debug symbols in executable (-arch x86_64)

Access to Apple iOS 13 Simulator Release WK2(Tests):
https://build.webkit.org/builders/Apple%20iOS%2013%20Simulator%20Release%20WK2%20(Tests)?numbuilds=50

Access to Apple iPadOS 13 Simulator Release WK2(Tests)
https://build.webkit.org/builders/Apple%20iPadOS%2013%20Simulator%20Release%20WK2%20(Tests)?numbuilds=50

Log for latest occurrence on iPadOS 13 Simulator Release WK2(Tests) please see attached. For build 4417 at r266107 with failures gone on next build at r266112 but no revision seems to be cause of fix and happens again on different revision.

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