openai/codex · error · anyhow::Error

frame too large: {len}

Error message

frame too large: {len}

What it means

Error "frame too large: {len}" thrown in openai/codex.

Source

Thrown at codex-rs/windows-sandbox-rs/src/elevated/ipc_framed.rs:174

    }
    let len = payload.len() as u32;
    writer.write_all(&len.to_le_bytes())?;
    writer.write_all(&payload)?;
    writer.flush()?;
    Ok(())
}

/// Read a length-prefixed JSON frame; returns `Ok(None)` on EOF.
pub fn read_frame<R: Read>(mut reader: R) -> Result<Option<FramedMessage>> {
    let mut len_buf = [0u8; 4];
    match reader.read_exact(&mut len_buf) {
        Ok(()) => {}
        Err(err) if err.kind() == std::io::ErrorKind::UnexpectedEof => return Ok(None),
        Err(err) => return Err(err.into()),
    }
    let len = u32::from_le_bytes(len_buf) as usize;
    if len > MAX_FRAME_LEN {
        anyhow::bail!("frame too large: {len}");
    }
    let mut payload = vec![0u8; len];
    reader.read_exact(&mut payload)?;
    let msg: FramedMessage = serde_json::from_slice(&payload)?;
    Ok(Some(msg))
}

#[cfg(test)]
mod tests {
    use super::*;
    use pretty_assertions::assert_eq;

    #[test]
    fn framed_round_trip() {
        let msg = FramedMessage {
            version: IPC_PROTOCOL_VERSION,
            message: Message::Output {
                payload: OutputPayload {

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/windows-sandbox-rs/src/elevated/ipc_framed.rs:174 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/b35ba3dcd1913ba5. Report an issue: GitHub.