Attaching to process "fails", but debugging works

[connor4312]

Testing microsoft/vscode-python-debugger#35 on macOS and Python 3.11.4

1. Run python3
2. Attach to that process
3. Output in the debug console indicates attaching failed. However, vscode is still in a "debugging" state and breakpoints work

Terminal contents:

Attaching to PID: 67825 (elapsed: 1.01s).
Attaching to PID: 67825 (elapsed: 2.01s).
Attach to PID failed.
--- Starting attach to pid: 67825 ---
0.00s - Debugger warning: It seems that frozen modules are being used, which may
0.00s - make the debugger miss breakpoints. Please pass -Xfrozen_modules=off
0.00s - to python to disable frozen modules.
0.00s - Note: Debugging will proceed. Set PYDEVD_DISABLE_FILE_VALIDATION=1 to disable this validation.
(lldb) process attach --pid 67825
Process 67825 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
    frame #0: 0x00007ff80e98729e libsystem_kernel.dylib`poll + 10
libsystem_kernel.dylib`poll:
->  0x7ff80e98729e <+10>: jae    0x7ff80e9872a8            ; <+20>
    0x7ff80e9872a0 <+12>: movq   %rax, %rdi
    0x7ff80e9872a3 <+15>: jmp    0x7ff80e9819e4            ; cerror
    0x7ff80e9872a8 <+20>: retq   
Target 0: (Python) stopped.
Executable module set to "/usr/local/Cellar/python@3.11/3.11.4/Frameworks/Python.framework/Versions/3.11/Resources/Python.app/Contents/MacOS/Python".
Architecture set to: x86_64h-apple-macosx-.
(lldb) command script import "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/linux_and_mac/lldb_prepare.py"
(lldb) load_lib_and_attach "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/attach_x86_64.dylib" 0 "import codecs;import json;import sys;decode = lambda s: codecs.utf_8_decode(bytearray(s))[0] if s is not None else None;script_dir = decode([47, 85, 115, 101, 114, 115, 47, 99, 111, 110, 110, 111, 114, 47, 46, 118, 115, 99, 111, 100, 101, 45, 105, 110, 115, 105, 100, 101, 114, 115, 47, 101, 120, 116, 101, 110, 115, 105, 111, 110, 115, 47, 109, 115, 45, 112, 121, 116, 104, 111, 110, 46, 100, 101, 98, 117, 103, 112, 121, 45, 50, 48, 50, 51, 46, 49, 46, 49, 49, 55, 52, 49, 48, 48, 56, 47, 98, 117, 110, 100, 108, 101, 100, 47, 108, 105, 98, 115, 47, 100, 101, 98, 117, 103, 112, 121, 47, 97, 100, 97, 112, 116, 101, 114, 47, 46, 46, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 115, 101, 114, 118, 101, 114]);setup = json.loads(decode([123, 34, 109, 111, 100, 101, 34, 58, 32, 34, 99, 111, 110, 110, 101, 99, 116, 34, 44, 32, 34, 97, 100, 100, 114, 101, 115, 115, 34, 58, 32, 91, 34, 49, 50, 55, 46, 48, 46, 48, 46, 49, 34, 44, 32, 54, 52, 49, 52, 48, 93, 44, 32, 34, 119, 97, 105, 116, 95, 102, 111, 114, 95, 99, 108, 105, 101, 110, 116, 34, 58, 32, 102, 97, 108, 115, 101, 44, 32, 34, 108, 111, 103, 95, 116, 111, 34, 58, 32, 110, 117, 108, 108, 44, 32, 34, 97, 100, 97, 112, 116, 101, 114, 95, 97, 99, 99, 101, 115, 115, 95, 116, 111, 107, 101, 110, 34, 58, 32, 34, 56, 97, 51, 100, 53, 98, 101, 98, 50, 53, 57, 52, 97, 55, 99, 98, 55, 98, 101, 49, 99, 99, 53, 102, 57, 50, 57, 48, 52, 48, 48, 55, 50, 100, 52, 98, 101, 100, 54, 101, 49, 50, 52, 98, 49, 102, 49, 50, 48, 56, 57, 56, 100, 51, 54, 54, 50, 52, 57, 56, 55, 99, 48, 57, 34, 125]));sys.path.insert(0, script_dir);import attach_pid_injected;del sys.path[0];attach_pid_injected.attach(setup);" 0
/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/attach_x86_64.dylib
success
import codecs;import json;import sys;decode = lambda s: codecs.utf_8_decode(bytearray(s))[0] if s is not None else None;script_dir = decode([47, 85, 115, 101, 114, 115, 47, 99, 111, 110, 110, 111, 114, 47, 46, 118, 115, 99, 111, 100, 101, 45, 105, 110, 115, 105, 100, 101, 114, 115, 47, 101, 120, 116, 101, 110, 115, 105, 111, 110, 115, 47, 109, 115, 45, 112, 121, 116, 104, 111, 110, 46, 100, 101, 98, 117, 103, 112, 121, 45, 50, 48, 50, 51, 46, 49, 46, 49, 49, 55, 52, 49, 48, 48, 56, 47, 98, 117, 110, 100, 108, 101, 100, 47, 108, 105, 98, 115, 47, 100, 101, 98, 117, 103, 112, 121, 47, 97, 100, 97, 112, 116, 101, 114, 47, 46, 46, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 115, 101, 114, 118, 101, 114]);setup = json.loads(decode([123, 34, 109, 111, 100, 101, 34, 58, 32, 34, 99, 111, 110, 110, 101, 99, 116, 34, 44, 32, 34, 97, 100, 100, 114, 101, 115, 115, 34, 58, 32, 91, 34, 49, 50, 55, 46, 48, 46, 48, 46, 49, 34, 44, 32, 54, 52, 49, 52, 48, 93, 44, 32, 34, 119, 97, 105, 116, 95, 102, 111, 114, 95, 99, 108, 105, 101, 110, 116, 34, 58, 32, 102, 97, 108, 115, 101, 44, 32, 34, 108, 111, 103, 95, 116, 111, 34, 58, 32, 110, 117, 108, 108, 44, 32, 34, 97, 100, 97, 112, 116, 101, 114, 95, 97, 99, 99, 101, 115, 115, 95, 116, 111, 107, 101, 110, 34, 58, 32, 34, 56, 97, 51, 100, 53, 98, 101, 98, 50, 53, 57, 52, 97, 55, 99, 98, 55, 98, 101, 49, 99, 99, 53, 102, 57, 50, 57, 48, 52, 48, 48, 55, 50, 100, 52, 98, 101, 100, 54, 101, 49, 50, 52, 98, 49, 102, 49, 50, 48, 56, 57, 56, 100, 51, 54, 54, 50, 52, 57, 56, 55, 99, 48, 57, 34, 125]));sys.path.insert(0, script_dir);import attach_pid_injected;del sys.path[0];attach_pid_injected.attach(setup);
success
(lldb) process detach
Process 67825 detached
(lldb) script import os; os._exit(1)
E+00002.414: Code injection into PID=67825 failed:
             
             Traceback (most recent call last):
               File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/../debugpy/server/cli.py", line 391, in attach_to_pid
                 add_code_to_python_process.run_python_code(
               File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/add_code_to_python_process.py", line 528, in run_python_code_mac
                 subprocess.check_call(' '.join(cmd), shell=True, env=env)
               File "/usr/local/Cellar/python@3.11/3.11.4/Frameworks/Python.framework/Versions/3.11/lib/python3.11/subprocess.py", line 413, in check_call
                 raise CalledProcessError(retcode, cmd)
             subprocess.CalledProcessError: Command 'lldb --no-lldbinit --script-language Python -o 'process attach --pid 67825' -o 'command script import "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/linux_and_mac/lldb_prepare.py"' -o 'load_lib_and_attach "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/attach_x86_64.dylib" 0 "import codecs;import json;import sys;decode = lambda s: codecs.utf_8_decode(bytearray(s))[0] if s is not None else None;script_dir = decode([47, 85, 115, 101, 114, 115, 47, 99, 111, 110, 110, 111, 114, 47, 46, 118, 115, 99, 111, 100, 101, 45, 105, 110, 115, 105, 100, 101, 114, 115, 47, 101, 120, 116, 101, 110, 115, 105, 111, 110, 115, 47, 109, 115, 45, 112, 121, 116, 104, 111, 110, 46, 100, 101, 98, 117, 103, 112, 121, 45, 50, 48, 50, 51, 46, 49, 46, 49, 49, 55, 52, 49, 48, 48, 56, 47, 98, 117, 110, 100, 108, 101, 100, 47, 108, 105, 98, 115, 47, 100, 101, 98, 117, 103, 112, 121, 47, 97, 100, 97, 112, 116, 101, 114, 47, 46, 46, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 115, 101, 114, 118, 101, 114]);setup = json.loads(decode([123, 34, 109, 111, 100, 101, 34, 58, 32, 34, 99, 111, 110, 110, 101, 99, 116, 34, 44, 32, 34, 97, 100, 100, 114, 101, 115, 115, 34, 58, 32, 91, 34, 49, 50, 55, 46, 48, 46, 48, 46, 49, 34, 44, 32, 54, 52, 49, 52, 48, 93, 44, 32, 34, 119, 97, 105, 116, 95, 102, 111, 114, 95, 99, 108, 105, 101, 110, 116, 34, 58, 32, 102, 97, 108, 115, 101, 44, 32, 34, 108, 111, 103, 95, 116, 111, 34, 58, 32, 110, 117, 108, 108, 44, 32, 34, 97, 100, 97, 112, 116, 101, 114, 95, 97, 99, 99, 101, 115, 115, 95, 116, 111, 107, 101, 110, 34, 58, 32, 34, 56, 97, 51, 100, 53, 98, 101, 98, 50, 53, 57, 52, 97, 55, 99, 98, 55, 98, 101, 49, 99, 99, 53, 102, 57, 50, 57, 48, 52, 48, 48, 55, 50, 100, 52, 98, 101, 100, 54, 101, 49, 50, 52, 98, 49, 102, 49, 50, 48, 56, 57, 56, 100, 51, 54, 54, 50, 52, 57, 56, 55, 99, 48, 57, 34, 125]));sys.path.insert(0, script_dir);import attach_pid_injected;del sys.path[0];attach_pid_injected.attach(setup);" 0' -o 'process detach' -o 'script import os; os._exit(1)'' returned non-zero exit status 1.
             
             Stack where logged:
               File "<frozen runpy>", line 198, in _run_module_as_main
               File "<frozen runpy>", line 88, in _run_code
               File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/__main__.py", line 39, in <module>
                 cli.main()
               File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/../debugpy/server/cli.py", line 430, in main
                 run()
               File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/../debugpy/server/cli.py", line 398, in attach_to_pid
                 log.reraise_exception("Code injection into PID={0} failed:", pid)
               File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/../debugpy/common/log.py", line 222, in reraise_exception
                 _exception(format_string, *args, **kwargs)
             

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/__main__.py", line 39, in <module>
    cli.main()
  File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/../debugpy/server/cli.py", line 430, in main
    run()
  File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/../debugpy/server/cli.py", line 398, in attach_to_pid
    log.reraise_exception("Code injection into PID={0} failed:", pid)
  File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/adapter/../../debugpy/../debugpy/server/cli.py", line 391, in attach_to_pid
    add_code_to_python_process.run_python_code(
  File "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/add_code_to_python_process.py", line 528, in run_python_code_mac
    subprocess.check_call(' '.join(cmd), shell=True, env=env)
  File "/usr/local/Cellar/python@3.11/3.11.4/Frameworks/Python.framework/Versions/3.11/lib/python3.11/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command 'lldb --no-lldbinit --script-language Python -o 'process attach --pid 67825' -o 'command script import "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/linux_and_mac/lldb_prepare.py"' -o 'load_lib_and_attach "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/attach_x86_64.dylib" 0 "import codecs;import json;import sys;decode = lambda s: codecs.utf_8_decode(bytearray(s))[0] if s is not None else None;script_dir = decode([47, 85, 115, 101, 114, 115, 47, 99, 111, 110, 110, 111, 114, 47, 46, 118, 115, 99, 111, 100, 101, 45, 105, 110, 115, 105, 100, 101, 114, 115, 47, 101, 120, 116, 101, 110, 115, 105, 111, 110, 115, 47, 109, 115, 45, 112, 121, 116, 104, 111, 110, 46, 100, 101, 98, 117, 103, 112, 121, 45, 50, 48, 50, 51, 46, 49, 46, 49, 49, 55, 52, 49, 48, 48, 56, 47, 98, 117, 110, 100, 108, 101, 100, 47, 108, 105, 98, 115, 47, 100, 101, 98, 117, 103, 112, 121, 47, 97, 100, 97, 112, 116, 101, 114, 47, 46, 46, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 115, 101, 114, 118, 101, 114]);setup = json.loads(decode([123, 34, 109, 111, 100, 101, 34, 58, 32, 34, 99, 111, 110, 110, 101, 99, 116, 34, 44, 32, 34, 97, 100, 100, 114, 101, 115, 115, 34, 58, 32, 91, 34, 49, 50, 55, 46, 48, 46, 48, 46, 49, 34, 44, 32, 54, 52, 49, 52, 48, 93, 44, 32, 34, 119, 97, 105, 116, 95, 102, 111, 114, 95, 99, 108, 105, 101, 110, 116, 34, 58, 32, 102, 97, 108, 115, 101, 44, 32, 34, 108, 111, 103, 95, 116, 111, 34, 58, 32, 110, 117, 108, 108, 44, 32, 34, 97, 100, 97, 112, 116, 101, 114, 95, 97, 99, 99, 101, 115, 115, 95, 116, 111, 107, 101, 110, 34, 58, 32, 34, 56, 97, 51, 100, 53, 98, 101, 98, 50, 53, 57, 52, 97, 55, 99, 98, 55, 98, 101, 49, 99, 99, 53, 102, 57, 50, 57, 48, 52, 48, 48, 55, 50, 100, 52, 98, 101, 100, 54, 101, 49, 50, 52, 98, 49, 102, 49, 50, 48, 56, 57, 56, 100, 51, 54, 54, 50, 52, 57, 56, 55, 99, 48, 57, 34, 125]));sys.path.insert(0, script_dir);import attach_pid_injected;del sys.path[0];attach_pid_injected.attach(setup);" 0' -o 'process detach' -o 'script import os; os._exit(1)'' returned non-zero exit status 1.
Running: lldb --no-lldbinit --script-language Python -o 'process attach --pid 67825' -o 'command script import "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/linux_and_mac/lldb_prepare.py"' -o 'load_lib_and_attach "/Users/connor/.vscode-insiders/extensions/ms-python.debugpy-2023.1.11741008/bundled/libs/debugpy/_vendored/pydevd/pydevd_attach_to_process/attach_x86_64.dylib" 0 "import codecs;import json;import sys;decode = lambda s: codecs.utf_8_decode(bytearray(s))[0] if s is not None else None;script_dir = decode([47, 85, 115, 101, 114, 115, 47, 99, 111, 110, 110, 111, 114, 47, 46, 118, 115, 99, 111, 100, 101, 45, 105, 110, 115, 105, 100, 101, 114, 115, 47, 101, 120, 116, 101, 110, 115, 105, 111, 110, 115, 47, 109, 115, 45, 112, 121, 116, 104, 111, 110, 46, 100, 101, 98, 117, 103, 112, 121, 45, 50, 48, 50, 51, 46, 49, 46, 49, 49, 55, 52, 49, 48, 48, 56, 47, 98, 117, 110, 100, 108, 101, 100, 47, 108, 105, 98, 115, 47, 100, 101, 98, 117, 103, 112, 121, 47, 97, 100, 97, 112, 116, 101, 114, 47, 46, 46, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 46, 46, 47, 100, 101, 98, 117, 103, 112, 121, 47, 115, 101, 114, 118, 101, 114]);setup = json.loads(decode([123, 34, 109, 111, 100, 101, 34, 58, 32, 34, 99, 111, 110, 110, 101, 99, 116, 34, 44, 32, 34, 97, 100, 100, 114, 101, 115, 115, 34, 58, 32, 91, 34, 49, 50, 55, 46, 48, 46, 48, 46, 49, 34, 44, 32, 54, 52, 49, 52, 48, 93, 44, 32, 34, 119, 97, 105, 116, 95, 102, 111, 114, 95, 99, 108, 105, 101, 110, 116, 34, 58, 32, 102, 97, 108, 115, 101, 44, 32, 34, 108, 111, 103, 95, 116, 111, 34, 58, 32, 110, 117, 108, 108, 44, 32, 34, 97, 100, 97, 112, 116, 101, 114, 95, 97, 99, 99, 101, 115, 115, 95, 116, 111, 107, 101, 110, 34, 58, 32, 34, 56, 97, 51, 100, 53, 98, 101, 98, 50, 53, 57, 52, 97, 55, 99, 98, 55, 98, 101, 49, 99, 99, 53, 102, 57, 50, 57, 48, 52, 48, 48, 55, 50, 100, 52, 98, 101, 100, 54, 101, 49, 50, 52, 98, 49, 102, 49, 50, 48, 56, 57, 56, 100, 51, 54, 54, 50, 52, 57, 56, 55, 99, 48, 57, 34, 125]));sys.path.insert(0, script_dir);import attach_pid_injected;del sys.path[0];attach_pid_injected.attach(setup);" 0' -o 'process detach' -o 'script import os; os._exit(1)'

[BriceBoy]

I have the same message but breakpoints seem to not work properly. Vscode won't open the file in which breakpoints are and I can't even show variables values while debugging.

Python version 3.12.2
Debugpy version v2024.6.0

[rchiodo]

I would expect this isn't behaving the same anymore.