# Handoff Report — 2026-06-27T02:34:00+09:00

## 1. Observation
- Checked the original code for executor usage in `reversecore_mcp/tools/analysis/lief_tools.py` (lines 331–365) which used a `with` context manager block:
  ```python
  with concurrent.futures.ProcessPoolExecutor(max_workers=1) as executor:
      # ...
      try:
          result_data = future.result(timeout=60)
      except concurrent.futures.TimeoutError:
          executor.shutdown(wait=False, cancel_futures=True)
          return failure(...)
  ```
- Running unit tests using `pytest tests/unit/tools/analysis/test_lief_tools.py --cov=reversecore_mcp/tools/analysis/lief_tools.py --cov-report=term-missing` initially completed with 30 passing tests.
- Replaced the `with` context manager block with manual `ProcessPoolExecutor` lifecycle management (lines 331–368 in the modified `reversecore_mcp/tools/analysis/lief_tools.py`):
  ```python
  executor = concurrent.futures.ProcessPoolExecutor(max_workers=1)
  # ...
  try:
      result_data = future.result(timeout=60)
      executor.shutdown(wait=True)
  except concurrent.futures.TimeoutError:
      try:
          for p in list(executor._processes.values()):
              p.terminate()
              p.join(timeout=1.0)
      except Exception:
          pass
      executor.shutdown(wait=False, cancel_futures=True)
  ```
- Created four new test methods in `tests/unit/tools/analysis/test_lief_tools.py` starting at line 634:
  - `test_timeout_terminates_processes`
  - `test_shutdown_on_success`
  - `test_shutdown_on_broken_pool`
  - `test_shutdown_on_other_exceptions`
- Ran `pytest tests/unit/tools/analysis/test_lief_tools.py --cov=reversecore_mcp/tools/analysis/lief_tools.py --cov-report=term-missing` again. Verification output:
  - `34 passed in 2.79s`
  - `reversecore_mcp/tools/analysis/lief_tools.py` coverage is `98%`.
- Ran the entire project unit test suite `pytest tests/unit/ -v`. Verification output:
  - `1569 passed, 8 skipped in 23.49s`
- Checked formatting and linting:
  - `ruff check reversecore_mcp/tools/analysis/lief_tools.py tests/unit/tools/analysis/test_lief_tools.py` returned `All checks passed!`
  - `black --check reversecore_mcp/tools/analysis/lief_tools.py tests/unit/tools/analysis/test_lief_tools.py` returned `All done! ✨ 🍰 ✨ 2 files would be left unchanged.`

## 2. Logic Chain
1. Using the `with` statement blocks process exit until all executor threads/processes exit on `__exit__`. In Python's `ProcessPoolExecutor`, exiting the `with` block implicitly calls `executor.shutdown(wait=True)`. Even if `TimeoutError` was handled and `shutdown(wait=False)` was manually called, the end of the `with` block would still block/hang because of implicit wait on the processes if they hung at the C++ level.
2. Avoiding the `with` statement allows us to manage the lifecycle manually and bypass implicit `__exit__` waits.
3. Explicitly terminating `executor._processes.values()` via `.terminate()` sends SIGTERM (or equivalent) to the worker processes, forcing them to exit immediately.
4. Calling `.join(timeout=1.0)` ensures the OS cleans up zombie/defunct processes within 1 second.
5. Calling `executor.shutdown(wait=False, cancel_futures=True)` clears any pending futures without blocking.
6. The unit tests verify that:
   - On a timeout, `terminate()` and `join(timeout=1.0)` are called on the worker processes, and `executor.shutdown(wait=False, cancel_futures=True)` is called.
   - On success, `executor.shutdown(wait=True)` is called.
   - On broken process pools or general exceptions, `executor.shutdown(wait=False)` is called.

## 3. Caveats
- No caveats. The fix directly targets the timeout hang vulnerability as instructed, complies with the project's testing/coverage requirements, and has zero regressions.

## 4. Conclusion
- The timeout hang vulnerability in `parse_binary_with_lief` has been successfully resolved using manual ProcessPoolExecutor lifecycle management and subprocess termination.
- 98% test coverage has been achieved for `reversecore_mcp/tools/analysis/lief_tools.py`, passing the >=75% requirement.

## 5. Verification Method
- Execute the specific unit tests:
  ```bash
  pytest tests/unit/tools/analysis/test_lief_tools.py -v
  ```
- Check test coverage:
  ```bash
  pytest tests/unit/tools/analysis/test_lief_tools.py --cov=reversecore_mcp/tools/analysis/lief_tools.py --cov-report=term-missing
  ```
- Verify ruff/black lint compliance:
  ```bash
  ruff check reversecore_mcp/tools/analysis/lief_tools.py tests/unit/tools/analysis/test_lief_tools.py
  black --check reversecore_mcp/tools/analysis/lief_tools.py tests/unit/tools/analysis/test_lief_tools.py
  ```
- Inspect changed files:
  - `reversecore_mcp/tools/analysis/lief_tools.py`
  - `tests/unit/tools/analysis/test_lief_tools.py`
