mismatched number of fds in SuperExecMessage: {} in the mess

Error message

mismatched number of fds in SuperExecMessage: {} in the message, {} from the control message

What it means

Error "mismatched number of fds in SuperExecMessage: {} in the message, {} from the control message" thrown in openai/codex.

Source

Thrown at codex-rs/shell-escalation/src/unix/escalate_server.rs:315

                    action: EscalateAction::Run,
                })
                .await?;
        }
        EscalationDecision::Escalate(execution) => {
            socket
                .send(EscalateResponse {
                    action: EscalateAction::Escalate,
                })
                .await?;
            let (msg, fds) = tokio::select! {
                message = socket.receive_with_fds::<SuperExecMessage>() => {
                    message.context("failed to receive SuperExecMessage")?
                }
                _ = parent_cancellation_token.cancelled() => return Ok(()),
                _ = session_cancellation_token.cancelled() => return Ok(()),
            };
            if fds.len() != msg.fds.len() {
                return Err(anyhow::anyhow!(
                    "mismatched number of fds in SuperExecMessage: {} in the message, {} from the control message",
                    msg.fds.len(),
                    fds.len()
                ));
            }

            let PreparedExec {
                command,
                cwd,
                env,
                arg0,
            } = tokio::select! {
                prepared = command_executor.prepare_escalated_exec(&program, &argv, &workdir, env, execution) => prepared?,
                _ = parent_cancellation_token.cancelled() => return Ok(()),
                _ = session_cancellation_token.cancelled() => return Ok(()),
            };
            let (program, args) = command
                .split_first()

View on GitHub (pinned to 339751715c)

When it happens

Trigger: Thrown at codex-rs/shell-escalation/src/unix/escalate_server.rs:315 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/20f3c3ac881ef74e. Report an issue: GitHub.