the crash only happen a few time, When the crash happen，the mobile's memory is about 100mb（not all，one of them is 300mb）

this crash only occur in iOS13.1.3～13.5.1, But I didn't see any change about CFNetwork here

App May Execute this code many times, May this is the problem about this crash? NSURL *url = [NSURL URLWithString:hostString];   NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];   [request setAllHTTPHeaderFields:header];       NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];   sessionConfiguration.timeoutIntervalForRequest = MAXFLOAT;   self.session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:_operationQueue];   NSURLSessionWebSocketTask *webSocketTask = [self.session webSocketTaskWithRequest:request];

I meet this problem too, Anyone know the correct way to resolve ?