MaxListenersExceededWarning for resize after resume; one run later loses shell spawning with persistent EBADF

Summary

Summary

Long-running/resumed Command Code sessions intermittently stop before the requested task is complete. With warning traces enabled, two independent resumed sessions produced the same warning from the same bundled source location:

MaxListenersExceededWarning: Possible EventEmitter memory leak detected.
11 resize listeners added to [Socket]. MaxListeners is 10.
...
at file:///opt/homebrew/lib/node_modules/command-code/dist/cli.mjs:3:1248967
at commitHookEffectListMount (.../react-reconciler.production.js:6718:26)
at commitPassiveMountOnFiber (.../react-reconciler.production.js:8144:25)

In one of the runs, subsequent shell tools eventually started failing persistently with spawn EBADF, including commands as simple as true and echo. File-reading tools continued to work. Restarting/resuming can make the problem disappear temporarily, so the behavior appears intermittent.

I am not claiming that the resize-listener leak necessarily causes EBADF, but they occurred in the same process and the listener warning is independently reproducible.

Environment

• Command Code: 1.53.0
• Node.js: v25.6.1
• OS: macOS 26.6.2 (25G83), arm64
• Terminal: Apple Terminal, TERM=xterm-256color
• Command Code dependency: ink@7.1.0
• Models/providers tested:
  • baseten/zai-org/GLM-5.3-Flash
  • cheaperinference/glm-5.3-flash

The installed package declares Node.js >=22, so the active Node version satisfies its declared engine constraint.

Evidence

Two minimized sanitized traces are attached:

• commandcode-178c-sanitized.log: listener warning in a Baseten session, followed by successful continuation after manual input.
• commandcode-c89132d7-sanitized.log: identical listener warning in a CheaperInference session, followed later by persistent spawn EBADF for trivial local commands.

The full session transcripts are available privately if needed. They are not attached publicly because tool results contain project and infrastructure details.

Possibly related reports

• CommandCodeAI/command-code#601 — long sessions periodically stop with pending work and no error.
• QwenLM/qwen-code#7159 — the exact 11 resize listeners added to [WriteStream] warning; the linked fix reportedly shares a single terminal-size listener instead of attaching one per component instance.
• CommandCodeAI/command-code#466 — completed generation with no assistant response displayed/saved (not identical, but potentially related to response/stream handling).

Expected Behavior

Expected behavior

• Mounting/unmounting or resuming the TUI should not accumulate resize listeners.
• Long-running sessions should continue until the task is complete or report a clear reason for stopping.
• A failed child-process spawn should not permanently break all subsequent shell-tool invocations in that process.
• Empty assistant responses should be retried reliably or surfaced as an explicit error.

Actual Behavior

Actual behavior

There appear to be three observable failure modes:

1. The model returns a normal text message such as "moving to the next check", but no following tool call is made and the turn ends while todo items remain.

2. Some session records contain an assistant entry with an empty content array despite non-zero output-token usage. Command Code sometimes injects Please continue your response..., but recovery is inconsistent.

3. In one traced process, shell spawning later became unusable:

   SHELL [true]
   -> spawn EBADF
   
   SHELL [echo alive]
   -> spawn EBADF
   
   SHELL [echo hello]
   -> spawn EBADF
   

Restarting/resuming may allow the same session to continue for a long time, making the issue appear random.

Steps to reproduce the issue

Reproduction

1. Start or resume a session containing a multi-step coding task with many tool calls.

2. Let it run until it stops while work remains.

3. Resume with warnings and debug output captured:

   NODE_OPTIONS=--trace-warnings commandcode --debug \
     --resume <session-id> 2>&1 | tee /tmp/commandcode-debug.log
   

4. Continue the task through multiple tool calls.

5. Observe the MaxListenersExceededWarning after the eleventh resize listener is attached.

6. In one reproduced run, continue using shell tools; after several successful commands they begin returning spawn EBADF persistently.

The warning reproduced in two independent resumed processes with different session IDs and exactly the same Command Code bundle location.

Command Code Version

1.53.0

Operating System

macOS

Terminal/IDE

Apple Terminal, TERM=xterm-256color

Shell

No response

Session file (optional)

No response

Fix prompt (optional)

No response

Additional context

The normal --debug log primarily recorded startup/resume information and did not contain the runtime warning. Capturing stderr with NODE_OPTIONS=--trace-warnings was required to obtain the useful stack trace.

commandcode-178c-sanitized.log
commandcode-c89132d7-sanitized.log

まず NODE_OPTIONS=--trace-warnings と --debug --resume を使って警告を再現し、次に dist/cli.mjs 内のバンドルされた場所と、関連する Ink/React のスタックフレームを調べます。添付された 2 つのサニタイズ済みログを比較し、resize-listener の失敗と shell-spawn の失敗を別々に追跡します。再開したセッションで resize-listener が蓄積されなくなり、報告された shell-spawn の失敗が理解されて対処されれば完了です。