{"record":{"id":"7d30121af5c4e127","repo":"herdrdev/herdr","slug":"failed-to-spawn-herdr-server-err","errorCode":null,"errorMessage":"failed to spawn herdr server: {err}","messagePattern":"failed to spawn herdr server: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/server/autodetect.rs","lineNumber":203,"sourceCode":"///   socket overrides, etc.), except inherited socket overrides are cleared when\n///   this CLI invocation explicitly selected a session.\n///\n/// Returns the PID of the spawned server process.\npub fn spawn_server_daemon() -> io::Result<u32> {\n    let exe = std::env::current_exe().map_err(|err| {\n        io::Error::new(\n            err.kind(),\n            format!(\"failed to determine herdr executable path: {err}\"),\n        )\n    })?;\n\n    info!(exe = %exe.display(), \"spawning server daemon\");\n\n    let mut command = build_server_daemon_command(exe);\n\n    let pid =\n        crate::platform::launch_server_daemon_command(&mut command).map_err(|err: io::Error| {\n            io::Error::new(err.kind(), format!(\"failed to spawn herdr server: {err}\"))\n        })?;\n    info!(pid, \"server daemon spawned\");\n\n    Ok(pid)\n}\n\nfn build_server_daemon_command(exe: PathBuf) -> Command {\n    let mut command = Command::new(&exe);\n    command\n        .arg(\"server\")\n        // Redirect stdio to /dev/null\n        .stdin(std::process::Stdio::null())\n        .stdout(std::process::Stdio::null())\n        .stderr(std::process::Stdio::null());\n    crate::platform::detach_server_daemon_command(&mut command);\n\n    match std::env::current_dir() {\n        Ok(cwd) => {","sourceCodeStart":185,"sourceCodeEnd":221,"githubUrl":"https://github.com/herdrdev/herdr/blob/f457cff4f2648eee85d176f8a41861241d4e8428/src/server/autodetect.rs#L185-L221","documentation":"After resolving the executable path, spawn_server_daemon failed to launch the detached server process via the platform-specific launch_server_daemon_command. The OS spawn error is wrapped with a descriptive message. This is a process-spawn failure, not a server logic failure.","triggerScenarios":"Platform launch failing: executable not executable, fork/exec permission denied, resource limits (EAGAIN), SELinux/AppArmor denial, or bad environment inherited by the spawn.","commonSituations":"Binary permissions broken after manual copy, system out of processes/memory, security policy blocking daemonization, or cross-platform spawn helper incompatibility.","solutions":["Check errno in the message (PermissionDenied vs WouldBlock etc.) and fix accordingly","Verify the herdr binary is executable and its path is intact","Check system resource limits (ulimit -u, memory) if EAGAIN","Review security policy denials in system logs"],"exampleFix":null,"handlingStrategy":"retry","validationCode":"use std::os::unix::fs::PermissionsExt;\nassert!(std::env::current_exe().map(|p| p.metadata().map(|m| m.permissions().mode() & 0o111 != 0)).unwrap_or(false));","typeGuard":null,"tryCatchPattern":"Err(e) if e.kind() == io::ErrorKind::WouldBlock => retry spawn after short delay","preventionTips":["Keep the binary executable","Monitor fork/resource limits","Apply security-policy exceptions for the daemon"],"tags":["spawn","daemon","permissions","process"],"backgroundTag":"process-spawn-failed","analyzedSha":"f457cff4f2648eee85d176f8a41861241d4e8428","analyzedAt":"2026-08-28T15:41:09.197Z","schemaVersion":2},"datasetVersion":"2026-08-28T16:17:29.566Z"}