Bug 241572

Description:
http/tests/media/modern-media-controls/skip-back-support/skip-back-support-button-click.html

The first more frequent series of flaky crashes that I saw on the dashboard was on 6/9/2022 at 251426@main. 

REPRODUCTION STEPS
I can reproduce this on 251426@main, but unable to reproduce it on 251425@main or earlier.

Command: 
run-webkit-tests --debug --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 -f --no-retry http/tests/media/modern-media-controls/skip-back-support/skip-back-support-button-click.html

Result: 
Unexpected flakiness: crashes (1)
  http/tests/media/modern-media-controls/skip-back-support/skip-back-support-button-click.html [ Pass Crash ]

History:
https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2Fmedia%2Fmodern-media-controls%2Fskip-back-support%2Fskip-back-support-button-click.html&platform=mac&flavor=wk2&style=debug&limit=50000

Crash Log:
No crash log found for com.apple.WebKit.WebContent.Development:88822.

stdout:

stderr:
ERROR: Invalid Content-Type string ''
./platform/network/ParsedContentType.cpp(236) : bool WebCore::ParsedContentType::parseContentType(WebCore::Mode)
SHOULD NEVER BE REACHED
/Volumes/Data/worker/Apple-Monterey-Debug-Build/build/WebKitBuild/Debug/DerivedSources/WebKit/RemoteMediaResourceManagerMessageReceiver.cpp(89) : static void Messages::RemoteMediaResourceManager::DataReceived::callReply(IPC::Decoder &, CompletionHandler<void (WebKit::SharedMemory::IPCHandle &&)> &&)
1   0x2dc430789 WTFCrash
2   0x2b42e116b WTFCrashWithInfo(int, char const*, char const*, int)
3   0x2b4996bef Messages::RemoteMediaResourceManager::DataReceived::callReply(IPC::Decoder&, WTF::CompletionHandler<void (WebKit::SharedMemory::IPCHandle&&)>&&)
4   0x2b6673dd8 unsigned long long IPC::Connection::sendWithAsyncReply<Messages::RemoteMediaResourceManager::DataReceived, WebKit::RemoteMediaResourceProxy::dataReceived(WebCore::PlatformMediaResource&, WebCore::SharedBuffer const&)::$_12>(Messages::RemoteMediaResourceManager::DataReceived&&, WebKit::RemoteMediaResourceProxy::dataReceived(WebCore::PlatformMediaResource&, WebCore::SharedBuffer const&)::$_12&&, unsigned long long, WTF::OptionSet<IPC::SendOption>)::'lambda'(IPC::Decoder*)::operator()(IPC::Decoder*)
5   0x2b6673d21 WTF::Detail::CallableWrapper<unsigned long long IPC::Connection::sendWithAsyncReply<Messages::RemoteMediaResourceManager::DataReceived, WebKit::RemoteMediaResourceProxy::dataReceived(WebCore::PlatformMediaResource&, WebCore::SharedBuffer const&)::$_12>(Messages::RemoteMediaResourceManager::DataReceived&&, WebKit::RemoteMediaResourceProxy::dataReceived(WebCore::PlatformMediaResource&, WebCore::SharedBuffer const&)::$_12&&, unsigned long long, WTF::OptionSet<IPC::SendOption>)::'lambda'(IPC::Decoder*), void, IPC::Decoder*>::call(IPC::Decoder*)
6   0x2b585c9d7 WTF::Function<void (IPC::Decoder*)>::operator()(IPC::Decoder*) const
7   0x2b583a9b0 WTF::CompletionHandler<void (IPC::Decoder*)>::operator()(IPC::Decoder*)
8   0x2b583a61a IPC::Connection::dispatchMessage(IPC::Decoder&)
9   0x2b583adc5 IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)
10  0x2b583b3cd IPC::Connection::dispatchOneIncomingMessage()
11  0x2b585c305 IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_15::operator()()
12  0x2b585c219 WTF::Detail::CallableWrapper<IPC::Connection::enqueueIncomingMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >)::$_15, void>::call()
13  0x2dc45fdd2 WTF::Function<void ()>::operator()() const
14  0x2dc4fbb5e WTF::RunLoop::performWork()
15  0x2dc5005be WTF::RunLoop::performWork(void*)
16  0x7ff813034aeb __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
17  0x7ff813034a53 __CFRunLoopDoSource0
18  0x7ff8130347cd __CFRunLoopDoSources0
19  0x7ff8130331e8 __CFRunLoopRun
20  0x7ff8130327ac CFRunLoopRunSpecific
21  0x7ff813e86d9a -[NSRunLoop(NSRunLoop) runMode:beforeDate:]
22  0x7ff813f118d7 -[NSRunLoop(NSRunLoop) run]
23  0x7ff812cb2816 _xpc_objc_main
24  0x7ff812cb2239 xpc_main
25  0x2b50c22d0 WebKit::XPCServiceMain(int, char const**)
26  0x2b721084b WKXPCServiceMain
27  0x10c2f5f22 main
28  0x11ac6a51e
com.apple.WebKit.WebContent.Development terminated (pid 88822) for reason: crash
LEAK: 1 WebPageProxy