Bug 225169

Summary: [ iOS wk2 EWS ] imported/w3c/web-platform-tests/workers/interfaces/DedicatedWorkerGlobalScope/postMessage/structured-clone-message.html is flaky crash
Product: WebKit Reporter: Robert Jenner <jenner>
Component: New BugsAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: jbedard, webkit-bot-watchers-bugzilla, webkit-bug-importer, youennf
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   

Description Robert Jenner 2021-04-28 16:20:13 PDT
imported/w3c/web-platform-tests/workers/interfaces/DedicatedWorkerGlobalScope/postMessage/structured-clone-message.html

is a flaky crash on EWS iOS wk 2 only. 

Affected EWS Queue:
https://ews-build.webkit.org/#/builders/51

First occurrence appears to be here:
https://ews-build.webkit.org/#/builders/51/builds/12203

Most recent occurrence was here:
https://ews-build.webkit.org/#/builders/51/builds/12322


There is no crashlog produced with any of these reported crashes on EWS, the results just simply indicate that the test crashes. Also, because this test only crashes on EWS, and not on any other platforms, I cannot reproduce the crash anywhere.
Comment 1 Robert Jenner 2021-04-28 17:45:34 PDT
Updated test expectations to Pass Crash here:
https://trac.webkit.org/changeset/276743/webkit
Comment 2 Robert Jenner 2021-04-28 17:58:43 PDT
Test was first found flakey here:
https://ews-build.webkit.org/#/builders/51/builds/11834
Comment 3 Radar WebKit Bug Importer 2021-04-28 17:59:08 PDT
<rdar://problem/77295341>
Comment 4 Alexey Proskuryakov 2021-04-29 13:40:48 PDT
Not a real crash:

11:04:05.584 68569 com.apple.WebKit.WebContent.Development crash, pid = 75091
11:04:05.747 68569 This test marked as a crash because of no data while reading stdout for the server process.
11:04:05.747 68569 This test marked as a crash because of no data while reading stdout for the server process.
Comment 5 Alexey Proskuryakov 2021-04-29 13:42:10 PDT
(and there is not crash log in ~/Library/Logs/DiagnosticReports around this time)