[Webkit-unassigned] [Bug 248496] [ New Test ] (256342 at main): [ macOS Debug ] fast/events/message-port-gc-after-removing-event-listener.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248496

--- Comment #2 from Chris Dumez <cdumez at apple.com> ---
I managed to get this crash trace from one of the bots:

Crashed Thread:        12  WebCore: Worker

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000005
Exception Codes:       0x0000000000000001, 0x0000000000000005

Termination Reason:    Namespace SIGNAL, Code 11 Segmentation fault: 11
Terminating Process:   exc handler [41345]

VM Region Info: 0x5 is not in any region.  Bytes before following region: 4377247739
      REGION TYPE                    START - END         [ VSIZE] PRT/MAX SHRMOD  REGION DETAIL
      UNUSED SPACE AT START
--->  
      __TEXT                      104e78000-104e7c000    [   16K] r-x/r-x SM=COW  ...t.Development

Thread 12 Crashed:: Dispatch queue: 
0  com.apple.WebCore                   0x108ca1d64 JSC::JSCell::isObject() const
1  com.apple.WebCore                   0x108cb4c08 JSC::JSValue::isObject() const
2  com.apple.WebCore                   0x108cb4c08 JSC::JSValue::isObject() const
3  com.apple.WebCore                   0x10b177420 WebCore::isWorldCompatible(JSC::JSGlobalObject&, JSC::JSValue)
4  com.apple.WebCore                   0x10b177338 WebCore::cloneAcrossWorlds(JSC::JSGlobalObject&, WebCore::JSDOMObject const&, JSC::JSValue)
5  com.apple.WebCore                   0x10b1605f0 WebCore::cachedPropertyValue(JSC::JSGlobalObject&, WebCore::JSDOMObject const&, WebCore::JSValueInWrappedObject&, WTF::Function<JSC::JSValue ()> const&)
6  com.apple.WebCore                   0x10b207e2c WebCore::JSMessageEvent::ports(JSC::JSGlobalObject&) const
7  com.apple.WebCore                   0x10948e9b8 WebCore::jsMessageEvent_portsGetter(JSC::JSGlobalObject&, WebCore::JSMessageEvent&)
8  com.apple.WebCore                   0x1093cbf0c long long WebCore::IDLAttribute<WebCore::JSMessageEvent>::get<&(WebCore::jsMessageEvent_portsGetter(JSC::JSGlobalObject&, WebCore::JSMessageEvent&)), (WebCore::CastedThisErrorBehavior)3>(JSC::JSGlobalObject&, long long, JSC::PropertyName)
9  com.apple.WebCore                   0x1093cbde8 WebCore::jsMessageEvent_ports(JSC::JSGlobalObject*, long long, JSC::PropertyName)
10  com.apple.JavaScriptCore           0x147530c9c WTF::FunctionPtr<(WTF::PtrTag)57072, long long (JSC::JSGlobalObject*, long long, JSC::PropertyName), (WTF::FunctionAttributes)1>::operator()(JSC::JSGlobalObject*, long long, JSC::PropertyName) const
11  com.apple.JavaScriptCore           0x147794a0c JSC::PropertySlot::customGetter(JSC::VM&, JSC::PropertyName) const
12  com.apple.JavaScriptCore           0x145f6716c JSC::PropertySlot::getValue(JSC::JSGlobalObject*, JSC::PropertyName) const
13  com.apple.JavaScriptCore           0x14602c6e0 JSC::JSValue::get(JSC::JSGlobalObject*, JSC::PropertyName, JSC::PropertySlot&) const
14  com.apple.JavaScriptCore           0x147115f40 JSC::LLInt::performLLIntGetByID(JSC::BytecodeIndex, JSC::CodeBlock*, JSC::JSGlobalObject*, JSC::JSValue, JSC::Identifier const&, JSC::GetByIdModeMetadata&)
15  com.apple.JavaScriptCore           0x147115ca8 llint_slow_path_get_by_id

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