claude-code - 💡(How to fix) Fix [BUG] Stack overflow: infinite recursion between Fw (spinnerTip updater) and P5 callback in main loop [1 comments, 2 participants]

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

Claude Code CLI crashed with what appears to be infinite recursion / stack overflow in the main loop's spinner tip updater. The stack trace shows Fw (spinnerTip useCallback) and P5 (a useRef guard) calling each other repeatedly until the process died.

Stack trace (top frames, repeats indefinitely)

• (B:/~BUN/root/src/entrypoints/cli.js:9273:5663)
• PI (B:/~BUN/root/src/entrypoints/cli.js:512:63749)
• Fw (B:/~BUN/root/src/entrypoints/cli.js:512:76948)
• P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
• Fw (B:/~BUN/root/src/entrypoints/cli.js:512:76926)
• P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
• Fw (B:/~BUN/root/src/entrypoints/cli.js:512:77745)
• P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827) ... (Fw <-> P5 cycle repeats)

Side signal (printed to stderr just before the crash)

Error: sandbox required but unavailable: sandbox.failIfUnavailable is set — refusing to start without a working sandbox. This sandbox message was printed immediately before the recursion crash, but the actual termination cause is the stack overflow above, not the sandbox check.

Suspected location

Around cli.js:512:76900 — the spinnerTip useCallback (Fw) guarded by a useRef flag (P5.current). It looks like the guard is not being reset on some code path, or the setAppState setter inside the .then() re-enters synchronously and triggers another Fw call before P5.current is cleared.

Environment

• Claude Code version: 2.1.120
• Model: Claude Opus 4.7 (1M context) — claude-opus-4-7[1m]
• OS: Windows 11 Pro 10.0.26200 (win32)
• Shell: Git Bash
• Runtime: Bun (B:/~BUN/root/...)
• Working dir: git repo, path contains non-ASCII characters
• Active MCP servers (many): filesystem, github, playwright, vibium, sequential-thinking, TestAI-Prod, claude_ai_Gmail, Google_Drive, Google_Calendar, notion, etc.
• bkit plugin active (SessionStart hook injecting context)

Reproduction

Not reliably reproducible. Occurred once during a long-running session with many active plugins/MCP servers and the bkit SessionStart hook emitting a large context block. No specific user action triggered it — the crash happened mid-session.

Expected

Spinner tip update should be idempotent / debounced and never recurse into itself. Even if setAppState triggers a re-render, the P5.current guard should prevent re-entry.

Actual

Fw and P5 recurse indefinitely, exhausting the stack and killing the CLI.

What Should Happen?

The CLI should remain stable during long-running sessions. Specifically:

1. The spinner tip updater (Fw) should be safely idempotent and protected against re-entry. The useRef guard (P5.current) must be reliably
   reset on all code paths — including when the inner setAppState call triggers a synchronous re-render or when the underlying H07(...).then() resolves/rejects unexpectedly.

2. Even under adverse conditions (sandbox unavailable, MCP server timeouts, large hook-injected context, many concurrent plugins), the main loop should never enter unbounded recursion. A defensive depth limit or debounce on spinner tip updates would prevent stack-overflow crashes.

3. If the sandbox is genuinely required but unavailable (sandbox.failIfUnavailable set), the CLI should exit cleanly with the stderr message that's already being printed — not crash via stack overflow afterward. The two failure modes appear entangled here.

4. Ideally, an unhandled stack overflow in internal UI/state code should surface a clear error to the user (e.g. "internal error: spinner tip recursion — please report") rather than a raw minified stack trace, so users can recover without losing session context.

Error Messages/Logs

### 1. Stack trace (printed on crash, repeats until stack exhausted)                                                                   
  -  (B:/~BUN/root/src/entrypoints/cli.js:9273:5663)
  - PI (B:/~BUN/root/src/entrypoints/cli.js:512:63749)                                                                                   
  - Fw (B:/~BUN/root/src/entrypoints/cli.js:512:76948)
  - P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
  - Fw (B:/~BUN/root/src/entrypoints/cli.js:512:76926)
  - P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
  - Fw (B:/~BUN/root/src/entrypoints/cli.js:512:77745)
  - P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
  - Fw (B:/~BUN/root/src/entrypoints/cli.js:512:76926)
  - P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
  ... (Fw <-> P5 alternation continues indefinitely)

  ### 2. stderr output emitted just before the crash
  Error: sandbox required but unavailable:
    sandbox.failIfUnavailable is set — refusing to start without a working sandbox.

  ### 3. Surrounding code context at cli.js:9273 (minified)
  
  let j8 = hq.getSandboxUnavailableReason();
  if (!j8) return;
  if (hq.isSandboxRequired()) {
    process.stderr.write(`
  Error: sandbox required but unavailable: ${j8}
  `+`  sandbox.failIfUnavailable is set — refusing to start without a working sandbox.
  `);
    ...
  }

  4. Additional notes

  - No .claude/logs/ entries were generated for this crash (process died
  before flush).
  - No exit code captured — terminal showed the stack trace then returned to
  the shell prompt.
  - No core dump produced.
  - The crash occurred mid-conversation; the immediately preceding user input
  was a normal text message (not a tool invocation, not a slash command).

Steps to Reproduce

Note: I have NOT been able to reliably reproduce this crash. It occurred
once during a long-running session. Below is the best description of the state at the time of the crash, in case it helps narrow down the trigger.

Environment at time of crash

1. Started Claude Code in a Windows 11 (Git Bash) terminal: claude (in working dir C:\Users\win10_original\agiqa\agi-qa-workspace\tmkim, a git repo with non-ASCII characters in the parent path)

2. Session was running with the bkit plugin active, which injects a large SessionStart hook context block (~several KB of system reminders, skill listings, deferred tool listings) on every session start.

3. Multiple MCP servers were configured and active: filesystem, github, playwright, vibium, sequential-thinking, TestAI-Prod, claude_ai_Gmail, claude_ai_Google_Drive, claude_ai_Google_Calendar, notion, plugin_playwright_playwright.

4. Model in use: Claude Opus 4.7 (1M context).

5. Session had been active for an extended period with multiple turns, tool uses, and large tool results in the context window.

Last action before crash

• Sent a normal text message to the assistant (no slash command, no tool).
• The assistant began responding; mid-response, the CLI crashed with the stack overflow shown in "Error Messages/Logs".

What I tried for reproduction (none reproduced the crash)

1. Restarted Claude Code in the same directory → worked normally.
2. Opened a fresh session with the same MCP/plugin set → worked normally.
3. Sent the same message that preceded the crash → no crash.

Hypothesized triggers (unverified)

• Long session with many tool results may have inflated some internal state that the spinner tip updater iterates over.
• Sandbox-unavailable condition (the stderr message printed just before the crash) may have set the system into a state where Fw/P5 lost their re-entry guard.
• Very large SessionStart hook context (bkit) producing a render burst that re-triggered setAppState synchronously inside Fw.

If logs/replay artifacts would help, please advise what to capture next time and I'll attach them on recurrence.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

2.1.120

Claude Code Version

2.1.120

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Warp

Additional Information

ERROR FKH is not a function. (In 'FKH(K)', 'FKH' is undefined)

B:/~BUN/root/src/entrypoints/cli.js:9273:5663

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${O.agentId} gone, removing orphaned cron ${O.id}),n8H([O.id]);return}let D=ep_(O.kind==="loop"?Claude resuming /loop
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