Summary Our app’s WKWebView triggers a WebContent / GPU process crash on iPhone 15 running iOS 26.4. The same flow works on iPad running iOS 26.4. Environment Failing: iPhone 15, iOS 26.4 Working: iPad, iOS 26.4 Web stack: WKWebView / WebKit (Safari & Web) What we see The WKWebView web process terminates; logs show WebProcess and GPU process exits, followed by RBS assertion failures and (in one WebContent process) repeated containermanagerd XPC invalidation. Expected Web content loads and remains stable like on iPad 26.4. Actual Web process crashes; page goes blank or WebView recovers only after reload. Logs 0x10715d518 - [pageProxyID=14, webPageID=15, PID=3629] WebPageProxy::dispatchProcessDidTerminate: reason=Crash\ 0x10715ce18 - [pageProxyID=22, webPageID=23, PID=3629] WebPageProxy::dispatchProcessDidTerminate: reason=Crash\ 0x1480f01e0 - GPUProcessProxy::didClose:\ 0x1480f01e0 - GPUProcessProxy::gpuProcessExited: reason=Crash\ 0x14808c640 - [PID=3633] WebProcessProxy::gpuProcessExited: reason=Crash\ 0x14808cb80 - [PID=3634] WebProcessProxy::gpuProcessExited: reason=Crash\ WebContent[3633] 0x10d07ebc0 - GPUProcessConnection::didClose\ Error acquiring assertion: <Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process 3630 does not exist" UserInfo=\{NSLocalizedFailureReason=Specified target process 3630 does not exist\}>\ 0x148128600 - ProcessAssertion::acquireSync Failed to acquire RBS assertion 'XPCConnectionTerminationWatchdog' for process with PID=3630, error: (null)\ WebContent[3634] XPC connection to containermanagerd invalidated. Retry attempt 1 of 6\ WebContent[3634] XPC connection to containermanagerd invalidated. Retry attempt 2 of 6\ WebContent[3634] XPC connection to containermanagerd invalidated. Retry attempt 3 of 6\ WebContent[3634] XPC connection to containermanagerd invalidated. Retry attempt 4 of 6\ WebContent[3634] XPC connection to containermanagerd invalidated. Retry attempt 5 of 6\ WebContent[3634] XPC connection to containermanagerd invalidated. Retry attempt 6 of 6\ WebContent[3634] _container_query_get_result_at_index: error = 2\uc0\u8594 (51) XPC_INVALID_REPLY;\ WebContent[3634] container_system_group_path_for_identifier: error = ((container_error_t)51) XPC_INVALID_REPLY\ WebContent[3634] 0x11107ebc0 - GPUProcessConnection::didClose\