deepseek-ai/deepseek-harness · error · Error

PTY session is closing

Error message

PTY session is closing

What it means

Error "PTY session is closing" thrown in deepseek-ai/deepseek-harness.

Source

Thrown at packages/terminal/terminal-bash/src/session.ts:226

   */
  async initialize(signal?: AbortSignal): Promise<void> {
    this.initializing = true
    try {
      const operation = this.startSend({ text: '', submit: false, ...signal !== undefined ? { signal } : {} })
      const result = await operation.done
      if (result.waitReason === 'session_exit') throw new Error('PTY shell exited during startup')
      if (result.waitReason === 'timeout') throw new Error('PTY shell did not reach readiness before startup timeout')
      this.motd = result.viewport
    } catch (error: unknown) {
      signal?.throwIfAborted()
      throw error
    } finally {
      this.initializing = false
    }
  }

  startSend(request: TerminalSendRequest): TerminalSendOperation {
    if (this.closing) throw new Error('PTY session is closing')
    if (this.statusValue.kind === 'exited') throw new Error('PTY session has exited')
    if (this.active !== undefined) {
      const draining = this.activeWrite !== undefined
        ? ' or draining provider write'
        : this.interrupting !== undefined
          ? ' or draining foreground interrupt'
          : ''
      throw new TerminalError(`PTY session already has an active send${draining}`, 'SEND_ACTIVE')
    }
    if (request.signal?.aborted === true) throw new Error('PTY send aborted before write')

    const operation = new LocalSendOperation(
      this.config.maxReadBytes,
      Date.now(),
      () => { this.interrupt(operation) },
    )
    this.active = operation
    this.resetReadinessEvidence()

View on GitHub (pinned to b150a551b8)

Solutions

1. Wait for the close to finish and open a new session for further I/O.

When it happens

Trigger: Thrown at packages/terminal/terminal-bash/src/session.ts:226 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of deepseek-ai/deepseek-harness@b150a551b8 (2026-08-24). Data as JSON: /api/errors/ba83087130a18965. Report an issue: GitHub.