使用lldb调试Python脚本遇报错，脚本可正常运行却无法调试

Hey there! Let's troubleshoot why your Python script runs fine in the terminal but won't cooperate with lldb debugging. Here are some practical steps to fix this:

The most common issue is using the wrong Python binary or incorrect launch syntax. Your terminal might be using a different Python version than the one lldb picks up by default.

• First, find the exact path of the Python you use in the terminal:

  which python3  # or "which python" if you're using Python 2
  

• Then launch lldb with this explicit path:

  lldb -- /path/to/your/python your_script.py
  

  For example, if which python3 returns /usr/local/bin/python3, run lldb -- /usr/local/bin/python3 your_script.py.

Most pre-installed Python builds don't include debug symbols, which lldb needs to map code to line numbers and inspect variables.

• To check if your Python has debug symbols:
  1. Get your Python executable path:

     python3 -c "import sys; print(sys.executable)"
     

  2. Load it in lldb and check for debug info:

     lldb /path/to/your/python
     (lldb) image list -o -f
     

  Look for entries ending with .dSYM (on macOS) or debug symbol references. If there's no debug data:
  • On Debian/Ubuntu, install the debug package: sudo apt install python3-dbg
  • On macOS, you can install a debug build via Homebrew: brew install python --with-debug
  • Or build Python from source with the --with-debug flag.

Setting line breakpoints directly before launching the script might not work if lldb hasn't loaded the Python script's code yet. Try this workflow:

1. Launch lldb with your Python binary:

   lldb /path/to/your/python
   

2. Set a breakpoint at Python's entry point (Py_Main):

   (lldb) breakpoint set -n Py_Main
   

3. Specify your script as a run argument:

   (lldb) settings set -- target.run-args your_script.py
   

4. Start execution:

   (lldb) run
   

5. Once the Py_Main breakpoint hits, set a line breakpoint in your script:

   (lldb) breakpoint set -f your_script.py -l 10  # Replace 10 with your target line number
   

6. Continue execution:

   (lldb) continue
   

Sometimes environment variables that help your script run can interfere with lldb's debugging process. Test with a clean environment:

env -i lldb -- /path/to/your/python your_script.py

If this works, add back your environment variables one by one to find the culprit.

Older versions of lldb and Python might have compatibility bugs. Check your versions:

lldb --version
python3 --version

Make sure you're using a recent pair (e.g., lldb 15+ with Python 3.10+). Update them via your package manager or official sources if needed.

内容的提问来源于stack exchange，提问作者user3696282