Segfault on propertynames

[tecosaur]

Affects: PythonCall / JuliaCall / Both [delete as appropriate]

Describe the bug

Using Python 3.12.8 and Julia 1.11, when I type <pyobject>. into the REPL, I see a segfault.

Your system

julia> versioninfo()
Julia Version 1.11.2
Commit 5e9a32e7af2 (2024-12-01 20:02 UTC)
Build Info:
  Official https://julialang.org/ release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 64 × AMD Ryzen Threadripper 3970X 32-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-16.0.6 (ORCJIT, znver2)
Threads: 60 default, 0 interactive, 30 GC (on 64 virtual cores)
Environment:
  JULIA_NUM_THREADS = 60
  JULIA_PROJECT = @.
  JULIA_EDITOR = emacs -nw

(...) pkg> st
Project HunFlair2 v0.1.0
Status `~/.../Project.toml`
  [992eb4ea] CondaPkg v0.2.24
  [6099a3de] PythonCall v0.9.23

(...) pkg> conda st
CondaPkg Status /.../CondaPkg.toml
Environment
  /.../.CondaPkg/env
Pip packages
  flair v0.14.0

Additional context

julia> s.
[57673] signal 11 (1): Segmentation fault
in expression starting at none:0
_PyInterpreterState_GET at /usr/local/src/conda/python-3.12.8/Include/internal/pycore_pystate.h:133 [inlined]
_PyType_Lookup at /usr/local/src/conda/python-3.12.8/Objects/typeobject.c:4729 [inlined]
_PyObject_LookupSpecial at /usr/local/src/conda/python-3.12.8/Objects/typeobject.c:2167
_dir_object at /usr/local/src/conda/python-3.12.8/Objects/object.c:1758 [inlined]
PyObject_Dir at /usr/local/src/conda/python-3.12.8/Objects/object.c:1790
PyObject_Dir at /home/tec/.julia/packages/PythonCall/Nr75f/src/C/pointers.jl:303 [inlined]
macro expansion at /home/tec/.julia/packages/PythonCall/Nr75f/src/Core/Py.jl:132 [inlined]
pydir at /home/tec/.julia/packages/PythonCall/Nr75f/src/Core/builtins.jl:216
propertynames at /home/tec/.julia/packages/PythonCall/Nr75f/src/Core/Py.jl:293
unknown function (ip: 0x7fab413505eb)
complete_symbol at /cache/build/tester-amdci5-12/julialang/julia-release-1-dot-11/usr/share/julia/stdlib/v1.11/REPL/src/REPLCompletions.jl:208
[...]

[protogeezer]

I see that crash trying to use the Matlab PythonAPI installed in a conda venv:

               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.11.3 (2025-01-21)
 _/ |\__'_|_|_|\__'_|  |  Official https://julialang.org/ release
|__/                   |

julia> using PythonCall

julia> me = pyimport("matlab.engine")
[long delay]
Python: <module 'matlab.engine' from '/home/sjbespa/.conda/envs/v3.12/lib/python3.12/site-packages/matlab/engine/__init__.py'>

julia> me.
[3507720] signal 11 (1): Segmentation fault
in expression starting at none:0
_PyInterpreterState_GET at /usr/local/src/conda/python-3.12.8/Include/internal/pycore_pystate.h:133 [inlined]
_PyType_Lookup at /usr/local/src/conda/python-3.12.8/Objects/typeobject.c:4729 [inlined]
_PyObject_LookupSpecial at /usr/local/src/conda/python-3.12.8/Objects/typeobject.c:2167
_dir_object at /usr/local/src/conda/python-3.12.8/Objects/object.c:1758 [inlined]
PyObject_Dir at /usr/local/src/conda/python-3.12.8/Objects/object.c:1790```

(@v1.11) pkg> status
Status ~/.julia/environments/v1.11/Project.toml
[8f4d0f93] Conda v1.10.2
[992eb4ea] CondaPkg v0.2.24
[497a8b3b] DoubleFloats v1.4.2
[6099a3de] PythonCall v0.9.24