[Webkit-unassigned] [Bug 143105] New: REGRESSION (r181993): inspector-protocol/debugger/setBreakpoint-dfg-and-modify-local.html crashes on Windows and Linux

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143105

            Bug ID: 143105
           Summary: REGRESSION (r181993):
                    inspector-protocol/debugger/setBreakpoint-dfg-and-modi
                    fy-local.html crashes on Windows and Linux
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: bfulgham at webkit.org, fpizlo at apple.com,
                    ggaren at apple.com, joepeck at webkit.org,
                    webkit-bug-importer at group.apple.com

inspector-protocol/debugger/setBreakpoint-dfg-and-modify-local.html crashes every time on Windows and Linux:

https://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=inspector-protocol%2Fdebugger%2FsetBreakpoint-dfg-and-modify-local.html

STDERR: ASSERTION FAILED: from.isCell() && from.asCell()->JSCell::inherits(std::remove_pointer<To>::type::info())
STDERR: ../../Source/JavaScriptCore/runtime/JSCell.h(250) : To JSC::jsCast(JSC::JSValue) [with To = JSC::JSScope*]
STDERR: 1   0x7f63e6ff3479 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(WTFCrashWithSecurityImplication+0x1e) [0x7f63e6ff3479]
STDERR: 2   0x7f63e69871ae /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(JSC::JSScope* JSC::jsCast<JSC::JSScope*>(JSC::JSValue)+0x6a) [0x7f63e69871ae]
STDERR: 3   0x7f63e6986e3e /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(JSC::Register::scope() const+0x20) [0x7f63e6986e3e]
STDERR: 4   0x7f63e6986dd7 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(JSC::ExecState::scope(int) const+0x2b) [0x7f63e6986dd7]
STDERR: 5   0x7f63e69865dc /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(JSC::DebuggerCallFrame::scope()+0x112) [0x7f63e69865dc]
STDERR: 6   0x7f63e6c710f5 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(Inspector::ScriptDebugServer::exceptionOrCaughtValue(JSC::ExecState*)+0x97) [0x7f63e6c710f5]
STDERR: 7   0x7f63e6c7003a /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(Inspector::ScriptDebugServer::dispatchDidPause(Inspector::ScriptDebugListener*)+0x134) [0x7f63e6c7003a]
STDERR: 8   0x7f63e6c70b57 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(Inspector::ScriptDebugServer::dispatchFunctionToListeners(WTF::HashSet<Inspector::ScriptDebugListener*, WTF::PtrHash<Inspector::ScriptDebugListener*>, WTF::HashTraits<Inspector::ScriptDebugListener*> > const&, void (Inspector::ScriptDebugServer::*)(Inspector::ScriptDebugListener*))+0x9f) [0x7f63e6c70b57]
STDERR: 9   0x7f63e6c70a86 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(Inspector::ScriptDebugServer::dispatchFunctionToListeners(void (Inspector::ScriptDebugServer::*)(Inspector::ScriptDebugListener*))+0x9a) [0x7f63e6c70a86]
STDERR: 10  0x7f63e6c70e4d /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(Inspector::ScriptDebugServer::handlePause(JSC::JSGlobalObject*, JSC::Debugger::ReasonForPause)+0x45) [0x7f63e6c70e4d]
STDERR: 11  0x7f63e69768a1 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(JSC::Debugger::pauseIfNeeded(JSC::ExecState*)+0x25d) [0x7f63e69768a1]
STDERR: 12  0x7f63e6976622 /home/slave/webkitgtk/gtk-linux-64-debug/build/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18(JSC::Debugger::updateCallFrameAndPauseIfNeeded(JSC::ExecState*)+0x36) [0x7f63e6976622]
...

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