[Webkit-unassigned] [Bug 153721] New: REGRESSION: Assertion failures in InspectorTimelineAgent::didCompleteCurrentRecord

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153721

            Bug ID: 153721
           Summary: REGRESSION: Assertion failures in
                    InspectorTimelineAgent::didCompleteCurrentRecord
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, ryanhaddad at apple.com,
                    timothy at apple.com, webkit-bug-importer at group.apple.com

We have started seeing frequent assertion failures in InspectorTimelineAgent::didCompleteCurrentRecord a couple days ago. Not a lot of tests crash, but overall, this nearly blocks debug EWS.

E.g.:
http://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#tests=imported%2Fblink%2Fanimations%2Fbase-render-style-body-crash.html
http://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=imported%2Fblink%2Fcompositing%2Flayer-creation%2Fiframe-clip-removed.html

ASSERTION FAILED: entry.type == type
/Volumes/Data/slave/elcapitan-debug/build/Source/WebCore/inspector/InspectorTimelineAgent.cpp(520) : void WebCore::InspectorTimelineAgent::didCompleteCurrentRecord(WebCore::TimelineRecordType)
1   0x110108670 WTFCrash
2   0x1131ac270 WebCore::InspectorTimelineAgent::didCompleteCurrentRecord(WebCore::TimelineRecordType)
3   0x1131b086c WebCore::InspectorTimelineAgent::internalStart(int const*)::$_1::operator()() const
4   0x1131b077d void std::__1::__invoke_void_return_wrapper<void>::__call<WebCore::InspectorTimelineAgent::internalStart(int const*)::$_1&>(WebCore::InspectorTimelineAgent::internalStart(int const*)::$_1&&&)

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