[Webkit-unassigned] [Bug 140279] New: Web Inspector: Uncaught Exception in ProbeManager deleting breakpoint

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140279

            Bug ID: 140279
           Summary: Web Inspector: Uncaught Exception in ProbeManager
                    deleting breakpoint
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joepeck at webkit.org
                CC: burg at cs.washington.edu, graouts at webkit.org,
                    joepeck at webkit.org, jonowells at apple.com,
                    mattbaker at apple.com, nvasilyev at apple.com,
                    timothy at apple.com, webkit-bug-importer at group.apple.com

Created attachment 244316
  --> https://bugs.webkit.org/attachment.cgi?id=244316&action=review
[TEST] Test Case

* SUMMARY
Sometimes I see an uncaught exception when removing a breakpoint. (Just spam creating and removing breakpoints).

* STEPS TO REPRODUCE
1. Inspect attached test case
2. Select resource "foo.min.js"
3. Pretty print the resource
4. Spam setting and removing a breakpoint on lines 4-6. (Reload the page occasionally)
  => exception in inspector

* NOTES
- Phantom breakpoint issues are unrelated and fixed elsewhere.
- Breakpoint not getting hit is unrelated and fixed elsewhere.

* EXCEPTION
[Error] TypeError: undefined is not an object (evaluating 'knownProbeIdentifiers.forEach')
    _breakpointActionsChanged (ProbeManager.js, line 152)
    dispatch (Object.js, line 141)
    dispatchEventToListeners (Object.js, line 156)
    clearActions (Breakpoint.js, line 356)
    removeBreakpoint (DebuggerManager.js, line 403)
    textEditorBreakpointRemoved (SourceCodeTextEditor.js, line 971)
    _documentMouseUp (TextEditor.js, line 1334)
    (anonymous function) ([native code], line 0)

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