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

[bugzilla-daemon at webkit.org]

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

            Bug ID: 239399
           Summary: ASSERTION FAILED: !m_isInitializingSendSource crashes
                    on the bots
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cdumez at apple.com
                CC: ggaren at apple.com, kkinnunen at apple.com,
                    simon.fraser at apple.com

ASSERTION FAILED: !m_isInitializingSendSource
/Volumes/Data/worker/macOS-AppleSilicon-Big-Sur-Debug-Build-EWS/build/Source/WebKit/Platform/IPC/cocoa/ConnectionCocoa.mm(255) : bool IPC::Connection::sendMessage(std::unique_ptr<MachMessage>)
1   0x1417c40b8 WTFCrash
2   0x1047692f0 std::__1::__optional_copy_assign_base<int, true>::__optional_copy_assign_base()
3   0x105238a18 IPC::Connection::sendMessage(std::__1::unique_ptr<IPC::MachMessage, std::__1::default_delete<IPC::MachMessage> >)
4   0x105239750 IPC::Connection::sendOutgoingMessage(WTF::UniqueRef<IPC::Encoder>&&)
5   0x105d1f264 IPC::Connection::sendOutgoingMessages()
6   0x105d3c2ec IPC::Connection::sendMessage(WTF::UniqueRef<IPC::Encoder>&&, WTF::OptionSet<IPC::SendOption>, std::__1::optional<WTF::Thread::QOS>)::$_2::operator()()
7   0x105d3c238 WTF::Detail::CallableWrapper<IPC::Connection::sendMessage(WTF::UniqueRef<IPC::Encoder>&&, WTF::OptionSet<IPC::SendOption>, std::__1::optional<WTF::Thread::QOS>)::$_2, void>::call()
8   0x1417ef884 WTF::Function<void ()>::operator()() const
9   0x1419323cc WTF::(anonymous namespace)::DispatchWorkItem::operator()()
10  0x1419303bc void WTF::dispatchWorkItem<WTF::(anonymous namespace)::DispatchWorkItem>(void*)
11  0x19f0b3ec0 _dispatch_client_callout
12  0x19f0bb6a8 _dispatch_lane_serial_drain
13  0x19f0bc2a4 _dispatch_lane_invoke
14  0x19f0c6b74 _dispatch_workloop_worker_thread
15  0x19f25f89c _pthread_wqthread
16  0x19f25e5d4 start_wqthread

frequently seen on the EWS bots, e.g. https://ews-build.s3-us-west-2.amazonaws.com/macOS-AppleSilicon-Big-Sur-Debug-WK2-Tests-EWS/457653-28957/results.html

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