[Webkit-unassigned] [Bug 196445] New: [ Mac Debug ] REGRESSION (r242975) Layout Test storage/indexeddb/modern/deletedatabase-2-private.html is a flaky failure

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=196445

            Bug ID: 196445
           Summary: [ Mac Debug ] REGRESSION (r242975) Layout Test
                    storage/indexeddb/modern/deletedatabase-2-private.html
                    is a flaky failure
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sroberts at apple.com
                CC: lforschler at apple.com

The following layout test is flaky on Mac WK2 Debug

storage/indexeddb/modern/deletedatabase-2-private.html

Probable cause:

After changes made in https://trac.webkit.org/changeset/242975/webkit 

Test started to become a flaky failure on Mac Debug builds. It has shown up once on the iOS Simulator Release queue, and I could reproduce it locally, but only about 1 in 1000 iterations.

With Mac Debug it is failing on average 10 in 500 iterations, and I cannot get it to fail in r242974 or older.

Reproduced with:

run-webkit-tests storage/indexeddb/modern/deletedatabase-2-private.html --iterations 500 -f --debug

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=storage%2Findexeddb%2Fmodern%2Fdeletedatabase-2-private.html

Diff:

--- /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/storage/indexeddb/modern/deletedatabase-2-private-expected.txt
+++ /Volumes/Data/slave/mojave-debug-tests-wk2/build/layout-test-results/storage/indexeddb/modern/deletedatabase-2-private-actual.txt
@@ -11,9 +11,9 @@
 Requesting deleteDatabase
 First connection received versionchange event: oldVersion 1, newVersion null
 First version change complete
-Open request error: AbortError
 Delete database success: oldVersion 1, newVersion null
 Recreating database to make sure it's new and empty
+Open request error: AbortError
 Second upgrade old version - 0 new version - 1
 Unable to get object store in second upgrade transaction (which is correct because it should not be there)
 Second database upgrade success

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