Bug 179394

LayoutTest http/tests/workers/service/service-worker-cache-api.https.html is intermittently crashing on macOS with the following backtrace: Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.WebCore 0x000000010521546d WebCore::SWServerJobQueue::scriptFetchFinished(WebCore::SWServer::Connection&, WebCore::ServiceWorkerFetchResult const&) + 77 (SWServerJobQueue.cpp:61) 1 com.apple.WebKit 0x0000000102fa5764 void IPC::handleMessage<Messages::WebSWServerConnection::FinishFetchingScriptInServer, WebKit::WebSWServerConnection, void (WebCore::SWServer::Connection::*)(WebCore::ServiceWorkerFetchResult const&)>(IPC::Decoder&, WebKit::WebSWServerConnection*, void (WebCore::SWServer::Connection::*)(WebCore::ServiceWorkerFetchResult const&)) + 259 (HandleMessage.h:40) 2 com.apple.WebKit 0x0000000102e0c5f3 WebKit::StorageToWebProcessConnection::didReceiveMessage(IPC::Connection&, IPC::Decoder&) + 183 (StorageToWebProcessConnection.cpp:85) 3 com.apple.WebKit 0x0000000102cd7ecb IPC::Connection::dispatchMessage(std::__1::unique_ptr<IPC::Decoder, std::__1::default_delete<IPC::Decoder> >) + 119 (Connection.cpp:930) 4 com.apple.WebKit 0x0000000102cdaa0a IPC::Connection::dispatchOneMessage() + 176 (Connection.cpp:959) 5 com.apple.JavaScriptCore 0x00000001083eba24 WTF::RunLoop::performWork() + 164 (RunLoop.cpp:107) 6 com.apple.JavaScriptCore 0x00000001083ebc42 WTF::RunLoop::performWork(void*) + 34 (RunLoopCF.cpp:39) 7 com.apple.CoreFoundation 0x00007fff8eb243e1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 8 com.apple.CoreFoundation 0x00007fff8eb0565c __CFRunLoopDoSources0 + 556 9 com.apple.CoreFoundation 0x00007fff8eb04b46 __CFRunLoopRun + 934 10 com.apple.CoreFoundation 0x00007fff8eb04544 CFRunLoopRunSpecific + 420 11 com.apple.Foundation 0x00007fff905354e2 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 277 12 com.apple.Foundation 0x00007fff905353ba -[NSRunLoop(NSRunLoop) run] + 76 13 libxpc.dylib 0x00007fffa4a9589b _xpc_objc_main + 731 14 libxpc.dylib 0x00007fffa4a942e4 xpc_main + 494 15 com.apple.WebKit.Storage 0x0000000102c8569a main + 490 (XPCServiceMain.mm:122) 16 libdyld.dylib 0x00007fffa483c235 start + 1 Thread 1: