[Webkit-unassigned] [Bug 239399] ASSERTION FAILED: !m_isInitializingSendSource crashes on the bots

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239399

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Also:

ASSERTION FAILED: !m_pendingOutgoingMachMessage && !m_isInitializingSendSource
/Volumes/Data/worker/macOS-AppleSilicon-Big-Sur-Debug-Build-EWS/build/Source/WebKit/Platform/IPC/cocoa/ConnectionCocoa.mm(289) : bool IPC::Connection::sendOutgoingMessage(UniqueRef<IPC::Encoder> &&)
1   0x13da707f8 WTFCrash
2   0x1009f86a0 std::__1::__optional_copy_assign_base<int, true>::__optional_copy_assign_base()
3   0x1014c751c IPC::Connection::sendOutgoingMessage(WTF::UniqueRef<IPC::Encoder>&&)
4   0x101fad5a8 IPC::Connection::sendOutgoingMessages()
5   0x101fca630 IPC::Connection::sendMessage(WTF::UniqueRef<IPC::Encoder>&&, WTF::OptionSet<IPC::SendOption>, std::__1::optional<WTF::Thread::QOS>)::$_2::operator()()
6   0x101fca57c WTF::Detail::CallableWrapper<IPC::Connection::sendMessage(WTF::UniqueRef<IPC::Encoder>&&, WTF::OptionSet<IPC::SendOption>, std::__1::optional<WTF::Thread::QOS>)::$_2, void>::call()
7   0x13da9c1c8 WTF::Function<void ()>::operator()() const
8   0x13dbde9d8 WTF::(anonymous namespace)::DispatchWorkItem::operator()()
9   0x13dbdc9c8 void WTF::dispatchWorkItem<WTF::(anonymous namespace)::DispatchWorkItem>(void*)
10  0x19928bec0 _dispatch_client_callout
11  0x1992936a8 _dispatch_lane_serial_drain
12  0x1992942a4 _dispatch_lane_invoke
13  0x19929eb74 _dispatch_workloop_worker_thread
14  0x19943789c _pthread_wqthread
15  0x1994365d4 start_wqthread
LEAK: 1 WebPageProxy

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