openai/codex · error · io::Error

file read block length must be between 1 and {FILE_READ_CHUN

Error message

file read block length must be between 1 and {FILE_READ_CHUNK_SIZE}

What it means

Error "file read block length must be between 1 and {FILE_READ_CHUNK_SIZE}" thrown in openai/codex.

Source

Thrown at codex-rs/exec-server/src/file_read.rs:115

    Ok(FileReadBlock {
        eof: bytes_read < len,
        bytes,
    })
}

#[cfg(unix)]
fn read_file_at(file: &File, bytes: &mut [u8], offset: u64) -> io::Result<usize> {
    std::os::unix::fs::FileExt::read_at(file, bytes, offset)
}

#[cfg(windows)]
fn read_file_at(file: &File, bytes: &mut [u8], offset: u64) -> io::Result<usize> {
    std::os::windows::fs::FileExt::seek_read(file, bytes, offset)
}

fn validate_read_block_len(len: usize) -> io::Result<()> {
    if !(1..=FILE_READ_CHUNK_SIZE).contains(&len) {
        return Err(io::Error::new(
            io::ErrorKind::InvalidInput,
            format!("file read block length must be between 1 and {FILE_READ_CHUNK_SIZE}"),
        ));
    }
    Ok(())
}

fn unknown_handle_error(handle_id: &str) -> io::Error {
    io::Error::new(
        io::ErrorKind::NotFound,
        format!("unknown file read handle `{handle_id}`"),
    )
}

View on GitHub (pinned to 339751715c)

Solutions

1. Request a block length between 1 and the maximum chunk size.

When it happens

Trigger: Thrown at codex-rs/exec-server/src/file_read.rs:115 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/a03ef38ee1e1f279. Report an issue: GitHub.