imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-050.html 
Is a flaky crash specifically on iOS EWS queues. 

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fcss%2Fcss-contain%2Fcontent-visibility%2Fcontent-visibility-050.html

Crash-Log:
Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BREAKPOINT (SIGTRAP)
Exception Codes:       0x0000000000000002, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Trace/BPT trap: 5
Termination Reason:    Namespace SIGNAL, Code 0x5
Terminating Process:   exc handler [15983]

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   org.webkit.WebKitTestRunnerApp	0x0000000106ce24d3 WTFCrashWithInfo(int, char const*, char const*, int) + 19
1   org.webkit.WebKitTestRunnerApp	0x0000000106d15730 WTR::TestInvocation::runUISideScriptImmediately(OpaqueWKError const*, void*) + 98
2   com.apple.WebKit              	0x000000010dcc7b2e WebKit::GenericCallback<>::performCallbackWithReturnValue() + 40
3   com.apple.WebKit              	0x000000010dcc3aa0 WebKit::RemoteLayerTreeDrawingAreaProxy::commitLayerTree(WebKit::RemoteLayerTreeTransaction const&, WebKit::RemoteScrollingCoordinatorTransaction const&) + 594
4   com.apple.WebKit              	0x000000010d9cbd03 WebKit::RemoteLayerTreeDrawingAreaProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 273
5   com.apple.WebKit              	0x000000010dc6445c IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::Decoder&) + 224
6   com.apple.WebKit              	0x000000010de3ea16 WebKit::WebProcessProxy::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 24
7   com.apple.WebKit              	0x000000010dc5dd5a IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) + 238
8   com.apple.WebKit              	0x000000010dc5d46f IPC::Connection::dispatchIncomingMessages() + 377
9   com.apple.JavaScriptCore      	0x00000001095aef4f WTF::RunLoop::performWork() + 431
10  com.apple.JavaScriptCore      	0x00000001095af822 WTF::RunLoop::performWork(void*) + 34
11  com.apple.CoreFoundation      	0x00007fff20369e25 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
12  com.apple.CoreFoundation      	0x00007fff20369d1d __CFRunLoopDoSource0 + 180
13  com.apple.CoreFoundation      	0x00007fff203691f2 __CFRunLoopDoSources0 + 242
14  com.apple.CoreFoundation      	0x00007fff20363951 __CFRunLoopRun + 875
15  com.apple.CoreFoundation      	0x00007fff20363103 CFRunLoopRunSpecific + 567
16  com.apple.Foundation          	0x00007fff2081941c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 213
17  org.webkit.WebKitTestRunnerApp	0x0000000106d07d7e WTR::TestController::platformRunUntil(bool&, WTF::Seconds) + 184
18  org.webkit.WebKitTestRunnerApp	0x0000000106d1132f WTR::TestInvocation::invoke() + 325
19  org.webkit.WebKitTestRunnerApp	0x0000000106cf8788 WTR::TestController::runTest(char const*) + 330
20  org.webkit.WebKitTestRunnerApp	0x0000000106cf8a1a WTR::TestController::runTestingServerLoop() + 128
21  org.webkit.WebKitTestRunnerApp	0x0000000106cf3931 WTR::TestController::TestController(int, char const**) + 479
22  org.webkit.WebKitTestRunnerApp	0x0000000106ce25a8 -[WebKitTestRunnerApp _runTestController] + 40
23  com.apple.Foundation          	0x00007fff2084258c __NSThreadPerformPerform + 207
24  com.apple.CoreFoundation      	0x00007fff20369e25 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
25  com.apple.CoreFoundation      	0x00007fff20369d1d __CFRunLoopDoSource0 + 180
26  com.apple.CoreFoundation      	0x00007fff20369254 __CFRunLoopDoSources0 + 340
27  com.apple.CoreFoundation      	0x00007fff20363951 __CFRunLoopRun + 875
28  com.apple.CoreFoundation      	0x00007fff20363103 CFRunLoopRunSpecific + 567
29  com.apple.GraphicsServices    	0x00007fff2c851cd3 GSEventRunModal + 139
30  com.apple.UIKitCore           	0x00007fff24ffbe63 -[UIApplication _run] + 928
31  com.apple.UIKitCore           	0x00007fff25000a53 UIApplicationMain + 101
32  org.webkit.WebKitTestRunnerApp	0x0000000106ce26a6 main + 65
33  dyld_sim                      	0x0000000106e03e1e start_sim + 10
34  ???                           	0x0000000000000001 0 + 1
35  ???                           	0x0000000000000002 0 + 2

Crash-log-url:
https://ews-build.s3-us-west-2.amazonaws.com/iOS-15-Simulator-WK2-Tests-EWS/455305-11157-rerun/imported/w3c/web-platform-tests/css/css-contain/content-visibility/content-visibility-050-crash-log.txt