[Webkit-unassigned] [Bug 150008] New: Web Inspector: Inspector randomly crashes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150008

            Bug ID: 150008
           Summary: Web Inspector: Inspector randomly crashes
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P1
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nvasilyev at apple.com
                CC: bburg at apple.com, graouts at webkit.org,
                    joepeck at webkit.org, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

ToT Inspector randomly crashes. Sometimes it crashes on about every page a few seconds after opening.

I entered the following in the terminal to log see inspector errors:

    defaults write com.apple.Safari "com.apple.Safari.ContentGroupPageIdentifier.WebKit2LogsPageMessagesToSystemConsoleEnabled" -bool YES
    defaults write com.apple.Safari WebKitLogsPageMessagesToSystemConsoleEnabled -bool YES

(via https://trac.webkit.org/wiki/WebInspectorDebugging#UsingLogginginsideWebInspectorUI)

Console output:
.../WebKitBuild/Release/WebInspectorUI.framework/Resources/Controllers/FormatterContentBuilder.js:171:23: CONSOLE ERROR
.../WebKitBuild/Release/WebInspectorUI.framework/Resources/Controllers/FormatterContentBuilder.js:171:23: CONSOLE ERROR
.../WebKitBuild/Release/WebInspectorUI.framework/Resources/Controllers/FormatterContentBuilder.js:171:23: CONSOLE ERROR
.../WebKitBuild/Release/WebInspectorUI.framework/Resources/Controllers/FormatterContentBuilder.js:171:23: CONSOLE ERROR
.../WebKitBuild/Release/WebInspectorUI.framework/Resources/Controllers/FormatterContentBuilder.js:171:23: CONSOLE ERROR
.../WebKitBuild/Release/WebInspectorUI.framework/Resources/Controllers/FormatterContentBuilder.js:171:23: CONSOLE ERROR

FormatterContentBuilder.js:171:23 is just a console.assert:

    dedent()
    {
        --this._indent;

        console.assert(this._indent >= 0);
        if (this._indent < 0)
            this._indent = 0;
    }


I don't think it's related to the crash.

How do I diagnose this?

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