[BUG] Stack overflow: infinite recursion between Fw (spinnerTip updater) and P5 callback in main loop

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] 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.

1. 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.

1. 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.

1. 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)

1. 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.

1. 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.

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

1. 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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