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Hi @eskimo, I have attached the Log file here. Firebase.txt Also, this is the code that potentially causes the crash. func resolve(query: String, then resultHandler: @escaping ResultHandler<URL>) -> Request { let request = DNSRequest() var context = Context(query: query, request: request, resultHandler: resultHandler) let semaphore = DispatchSemaphore(value: 0) DispatchQueue.global().async { var sdRef: DNSServiceRef? let contextRef = withUnsafePointer(to: &context) { UnsafeMutableRawPointer(mutating: $0) } DNSServiceQueryRecord(&sdRef, 0, 0, query, UInt16(kDNSServiceType_SRV), UInt16(kDNSServiceClass_IN), DNSServiceSRVLookup.dnsServiceQueryRecordReply, contextRef) let timeout = DispatchWorkItem { [weak request] in if let request = request, let timeout = request.timeoutWorkItem, !timeout.isCancelled { request.timedOut(.failure(EndpointResolverError.timedOut)) } } request.sdRef = sdRef request.resultHandler = resultHandler request.timeoutWorkItem = timeout DispatchQueue.main.asyncAfter(deadline: .now() + DNSServiceSRVLookup.timeout, execute: timeout) semaphore.signal() DNSServiceProcessResult(sdRef) } semaphore.wait() return request }