We receive bad address error Error: （kNWErrorDomainPOSIX 错误 14 - Bad address）,未能完成该操作。 Environment: iPhone 8#iOS#13.6# from completion handler in -[NSURLSessionWebSocketTask receiveMessageWithCompletionHandler:] or -[NSURLSessionWebSocketTask sendMessage:completionHandler:] I'm not quit sure which one since their reporting error from same function in our code :( =================================================== I was search information about #define EFAULT 14 /* Bad address */ and socket, most of content telling me that we did not pass buffer to socket function properly. But NSURLSessionWebSocketTask has no method for me to manipulate underlying socket. =================================================== We can not reproduce this error since it was reported from user device. Any possible reason that make this error happen?