openai/codex · error

Failed to convert arg to CString

Error message

Failed to convert arg to CString

What it means

Error "Failed to convert arg to CString" thrown in openai/codex.

Source

Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1566

        let proxy_route_spec = proxy_route_spec
            .unwrap_or_else(|| panic!("managed proxy mode requires a proxy route spec"));
        inner.push("--proxy-route-spec".to_string());
        inner.push(proxy_route_spec);
    }
    inner.push("--".to_string());
    inner.extend(command);
    inner
}

/// Exec the provided argv, panicking with context if it fails.
fn exec_or_panic(command: Vec<String>) -> ! {
    #[expect(clippy::expect_used)]
    let c_command =
        CString::new(command[0].as_str()).expect("Failed to convert command to CString");
    #[expect(clippy::expect_used)]
    let c_args: Vec<CString> = command
        .iter()
        .map(|arg| CString::new(arg.as_str()).expect("Failed to convert arg to CString"))
        .collect();

    let mut c_args_ptrs: Vec<*const libc::c_char> = c_args.iter().map(|arg| arg.as_ptr()).collect();
    c_args_ptrs.push(std::ptr::null());

    unsafe {
        libc::execvp(c_command.as_ptr(), c_args_ptrs.as_ptr());
    }

    // If execvp returns, there was an error.
    let err = std::io::Error::last_os_error();
    panic!("Failed to execvp {}: {err}", command[0].as_str());
}

#[cfg(test)]
#[path = "linux_run_main_tests.rs"]
mod tests;

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/linux-sandbox/src/linux_run_main.rs:1566 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of openai/codex@339751715c (2026-08-25). Data as JSON: /api/errors/d91d4347f0067cf1. Report an issue: GitHub.