{"record":{"id":"ef768e4a07b5fa75","repo":"git-ecosystem/git-credential-manager","slug":"failed-to-start-git-helper-0","errorCode":null,"errorMessage":"Failed to start Git helper '{0}'","messagePattern":"Failed to start Git helper '(.+?)'","errorType":"exception","errorClass":"Trace2Exception","httpStatus":null,"severity":"error","filePath":"src/Core/Git.cs","lineNumber":250,"sourceCode":"        // protocol will one day use a different IPC mechanism, whereas this code\n        // has to follow what upstream Git does.\n        public async Task<IDictionary<string, string>> InvokeHelperAsync(string args, IDictionary<string, string> standardInput = null)\n        {\n            var procStartInfo = new ProcessStartInfo(_gitPath)\n            {\n                Arguments = args,\n                RedirectStandardInput = true,\n                RedirectStandardOutput = true,\n                RedirectStandardError = false, // Do not redirect stderr as tracing might be enabled\n                UseShellExecute = false\n            };\n\n            var process = _processManager.CreateProcess(procStartInfo);\n            if (!process.Start(Trace2ProcessClass.Git))\n            {\n                var format = \"Failed to start Git helper '{0}'\";\n                var message = string.Format(format, args);\n                throw new Trace2Exception(_trace2, message, format);\n            }\n\n            if (!(standardInput is null))\n            {\n                await process.StandardInput.WriteDictionaryAsync(standardInput);\n                // some helpers won't continue until they see EOF\n                // cf git-credential-cache\n                process.StandardInput.Close();\n            }\n\n            IDictionary<string, string> resultDict = await process.StandardOutput.ReadDictionaryAsync(StringComparer.OrdinalIgnoreCase);\n\n            await Task.Run(() => process.WaitForExit());\n            int exitCode = process.ExitCode;\n\n            if (exitCode != 0)\n            {\n                if (!resultDict.TryGetValue(\"error\", out string errorMessage))","sourceCodeStart":232,"sourceCodeEnd":268,"githubUrl":"https://github.com/git-ecosystem/git-credential-manager/blob/e8ce762cd04b4100ae637b5fbf39ef9d0a96561e/src/Core/Git.cs#L232-L268","documentation":"Git.InvokeHelperAsync spawns a Git helper subprocess (e.g. git-credential-manager or another helper) with the given arguments. If ChildProcess.Start returns false — the OS could not launch the process — a Trace2Exception is thrown with the helper's argument list. This indicates the helper binary or its launcher could not be started at all.","triggerScenarios":"Calling InvokeHelperAsync (directly or via Config/Credential helper invocations) when the constructed ProcessStartInfo's executable cannot be started: the helper binary path is wrong, the file is missing, the platform cannot execute it, or process creation fails for permission/resource reasons.","commonSituations":"Broken or partial Git installation where git-credential-* helper binaries are missing; antivirus or policy blocking process spawn; wrong GitInstallation path after a Git upgrade; running the app in a sandbox without execute permission.","solutions":["Verify the Git installation and that the helper binary named in the message exists and is executable at that path.","Reinstall or repair Git so helper executables are restored.","Check antivirus/EDR or AppLocker policies that may block spawning the helper process.","Confirm GitInstallation/Path configuration points at the intended Git distribution, then retry."],"exampleFix":"// diagnosis: message shows which args failed\n// before (broken install)\nC:\\Program Files\\Git\\mingw64\\libexec\\git-core\\git-credential-manager.exe  // missing\n// after\n// reinstall Git so the helper exists, e.g. `winget install Git.Git`, then retry","handlingStrategy":"try-catch","validationCode":"if (!File.Exists(helperPath))\n{\n    throw new InvalidOperationException($\"Git helper not found at '{helperPath}'. Reinstall Git.\");\n}","typeGuard":null,"tryCatchPattern":"try\n{\n    var result = await git.InvokeHelperAsync(args, standardInput);\n}\ncatch (Trace2Exception ex)\n{\n    logger.LogError(ex, \"Could not start the Git helper process. Check the Git installation and that the helper path is executable.\");\n}","preventionTips":["Verify helper binaries exist and are executable after installing/upgrading Git.","Check antivirus/EDR allowlists for the helper executable.","Log the full ProcessStartInfo arguments to identify the failing command.","Run the helper manually to confirm it starts."],"tags":["process-start","git-helper","git","subprocess"],"backgroundTag":"command-not-found","analyzedSha":"e8ce762cd04b4100ae637b5fbf39ef9d0a96561e","analyzedAt":"2026-09-11T17:15:08.753Z","contentChangedAt":"2026-09-11T17:15:08.753Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}