chenhg5/cc-connect · error

codexSession: stdout pipe: %w

Error message

codexSession: stdout pipe: %w

What it means

Wraps a failed exec.Cmd.StdoutPipe() in codexSession.Send while preparing the per-turn codex subprocess. It fires before launch and indicates OS-level pipe allocation failure (typically fd exhaustion), not a codex problem.

Source

Thrown at agent/codex/session.go:161

	bin := cs.cmd
	if bin == "" {
		bin = "codex"
	}

	slog.Debug("codexSession: launching", "resume", isResume, "args", core.RedactArgs(args))

	cmd := exec.CommandContext(cs.ctx, bin, args...)
	cmd.Dir = cs.workDir
	prepareCmdForKill(cmd)
	if len(cs.extraEnv) > 0 {
		cmd.Env = core.MergeEnv(os.Environ(), cs.extraEnv)
	}
	cmd.Stdin = strings.NewReader(prompt)

	stdout, err := cmd.StdoutPipe()
	if err != nil {
		return fmt.Errorf("codexSession: stdout pipe: %w", err)
	}

	var stderrBuf bytes.Buffer
	cmd.Stderr = &stderrBuf

	if err := cmd.Start(); err != nil {
		return fmt.Errorf("codexSession: start: %w", err)
	}
	cs.addCmd(cmd)

	cs.wg.Add(1)
	go cs.readLoop(cmd, stdout, &stderrBuf)

	return nil
}

func (cs *codexSession) stageImages(prompt string, images []core.ImageAttachment) (string, []string, error) {
	if len(images) == 0 {

View on GitHub (pinned to 4000b2338a)

Solutions

1. Raise the process file-descriptor limit
2. Reduce concurrent codex turns/sessions
3. Investigate fd leaks in the daemon

When it happens

Trigger: Thrown at agent/codex/session.go:161 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of chenhg5/cc-connect@4000b2338a (2026-09-06). Data as JSON: /api/errors/5c06d8e132fc37ea. Report an issue: GitHub.