[Webkit-unassigned] [Bug 178198] New: Web Inspector: ASSERT_NOT_REACHED hit in PageDebuggerAgent::didAddEventListener

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178198

            Bug ID: 178198
           Summary: Web Inspector: ASSERT_NOT_REACHED hit in
                    PageDebuggerAgent::didAddEventListener
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ross.kirsling at sony.com
                CC: inspector-bugzilla-changes at group.apple.com

Repro steps:

1. run-minibrowser --debug / run-safari --debug
2. Open Web Inspector.
3. Enter "playstation.com" into URL bar.

Results:

1. this.treeOutline is unexpectedly null @ https://trac.webkit.org/browser/webkit/trunk/Source/WebInspectorUI/UserInterface/Views/DOMTreeElement.js#L1340
2. "SHOULD NEVER BE REACHED" @ https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/inspector/PageDebuggerAgent.cpp#L174

Note:

- Adding a null-check in DOMTreeElement does not stop the WebCore crash in PageDebuggerAgent.
- I assume this is related to https://trac.webkit.org/changeset/220036/webkit (unless result 1 points to a different root cause that I haven't identified).

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