{"record":{"id":"b2b60c7293c7d9fd","repo":"multica-ai/multica","slug":"failed-to-generate-state-w","errorCode":null,"errorMessage":"failed to generate state: %w","messagePattern":"failed to generate state: %w","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/cmd/multica/cmd_auth.go","lineNumber":261,"sourceCode":"\tcallbackHost, bindAddr := resolveCallbackBinding(flagHost, serverURL, appURL, detectOutboundIP)\n\n\t// Pin to \"tcp4\" — a bare \"tcp\" on macOS can produce an IPv6-only socket\n\t// that IPv4 clients (including browsers resolving localhost → 127.0.0.1)\n\t// cannot reach. The callback URL is always an IPv4 literal or hostname,\n\t// so an IPv4 listener is what the browser actually needs.\n\tlistener, err := net.Listen(\"tcp4\", bindAddr+\":0\")\n\tif err != nil {\n\t\treturn fmt.Errorf(\"could not start the local login callback server (used to receive the browser sign-in); a firewall or another process may be blocking local ports: %w\", err)\n\t}\n\tdefer listener.Close()\n\n\tport := listener.Addr().(*net.TCPAddr).Port\n\tcallbackURL := fmt.Sprintf(\"http://%s:%d/callback\", callbackHost, port)\n\n\t// Generate a random state parameter for CSRF protection.\n\tstateBytes := make([]byte, 16)\n\tif _, err := rand.Read(stateBytes); err != nil {\n\t\treturn fmt.Errorf(\"failed to generate state: %w\", err)\n\t}\n\tstate := hex.EncodeToString(stateBytes)\n\n\tloginURL := fmt.Sprintf(\"%s/login?cli_callback=%s&cli_state=%s\", appURL, url.QueryEscape(callbackURL), url.QueryEscape(state))\n\n\t// Channel to receive the JWT from the browser callback.\n\tjwtCh := make(chan string, 1)\n\terrCh := make(chan error, 1)\n\n\tmux := http.NewServeMux()\n\tmux.HandleFunc(\"/callback\", func(w http.ResponseWriter, r *http.Request) {\n\t\ttoken := r.URL.Query().Get(\"token\")\n\t\tif token == \"\" {\n\t\t\thttp.Error(w, \"missing token\", http.StatusBadRequest)\n\t\t\treturn\n\t\t}\n\t\treturnedState := r.URL.Query().Get(\"state\")\n\t\tif returnedState != state {","sourceCodeStart":243,"sourceCodeEnd":279,"githubUrl":"https://github.com/multica-ai/multica/blob/2c0912b6ec764b373d44eeea1e80f0d9f11ab417/server/cmd/multica/cmd_auth.go#L243-L279","documentation":"Browser login generates a 16-byte random state parameter for CSRF protection via crypto/rand. This error wraps a rand.Read failure, which on Go's modern userspace CSPRNG essentially never happens unless the OS entropy source is unavailable at very early boot or in a broken sandbox.","triggerScenarios":"Extremely early boot before the kernel CSPRNG is seeded; a seccomp/sandbox profile blocking the getrandom syscall; pathological VM/container setups where entropy device access is denied.","commonSituations":"Minimal VMs or scratch containers with restricted syscalls; almost never seen on normal workstations and servers.","solutions":["Retry the login command — entropy usually becomes available immediately","If in a restricted container, allow the getrandom syscall / /dev/urandom access","Fall back to token login: `multica login --token <PAT>`"],"exampleFix":null,"handlingStrategy":"retry","validationCode":null,"typeGuard":null,"tryCatchPattern":"# entropy is effectively always transient: single retry\nmultica login || { sleep 2; multica login; }","preventionTips":["Allow getrandom//dev/urandom in container seccomp profiles","If it recurs, switch to token login — it needs no local randomness"],"tags":["cli","auth","crypto","environment","login"],"backgroundTag":null,"analyzedSha":"2c0912b6ec764b373d44eeea1e80f0d9f11ab417","analyzedAt":"2026-08-15T13:25:18.241Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}