Julia crashes (Segmentation fault) when using tab completion with PythonCall

[truedichotomy]

Affects: PythonCall

Describe the bug
I'm running Julia 1.12.1 on macOS 26.1 and it will completely crash whenever I try to use tab completion on any loaded python library through PythonCall. I have Anaconda installed and tried both python 3.12 and 3.13 with the same result. I know it happens on both macOS 15.7 as well as macOS 26.1.

julia> using PythonCall

julia> sys = pyimport("sys")
Python: <module 'sys' (built-in)>

julia> sys.
[59054] signal 11 (2): Segmentation fault: 11
in expression starting at REPL[5]:1
	_PyObject_LookupSpecial at /opt/anaconda3/envs/ocean/lib/libpython3.12.dylib (unknown line)
PyObject_Dir at /opt/anaconda3/envs/ocean/lib/libpython3.12.dylib (unknown line)
PyObject_Dir at /Users/gong/.julia/packages/PythonCall/mkWc2/src/C/pointers.jl:300 [inlined]
macro expansion at /Users/gong/.julia/packages/PythonCall/mkWc2/src/Core/Py.jl:118 [inlined]
pydir at /Users/gong/.julia/packages/PythonCall/mkWc2/src/Core/builtins.jl:191
propertynames at /Users/gong/.julia/packages/PythonCall/mkWc2/src/Core/Py.jl:270
unknown function (ip: 0x137ae4353) at (unknown file)
#complete_symbol!#6 at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:230
complete_symbol! at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:184
unknown function (ip: 0x1379f407f) at (unknown file)
completions at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/REPLCompletions.jl:1150
#complete_line#66 at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:809
complete_line at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/REPL.jl:807
unknown function (ip: 0x13773052f) at (unknown file)
#complete_line_named#17 at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:401
complete_line_named at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:400 [inlined]
macro expansion at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:442 [inlined]
macro expansion at ./lock.jl:376 [inlined]
#check_show_hint##2 at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/usr/share/julia/stdlib/v1.12/REPL/src/LineEdit.jl:439
jfptr_YY.check_show_hintYY.YY.2_18133.1 at /Users/gong/.julia/juliaup/julia-1.12.1+0.aarch64.apple.darwin14/share/julia/compiled/v1.12/REPL/u0gqU_vMi9E.dylib (unknown line)
jl_apply at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/src/./julia.h:2391 [inlined]
start_task at /Users/julia/.julia/scratchspaces/a66863c6-20e8-4ff4-8a62-49f30b1f605e/agent-cache/default-honeycrisp-XG3Q6T6R70.0/build/default-honeycrisp-XG3Q6T6R70-0/julialang/julia-release-1-dot-12/src/task.c:1249
Allocations: 74692492 (Pool: 74688757; Big: 3735); GC: 117
zsh: segmentation fault  julia
(base) gong@pluto ~ %   

Your system

julia> versioninfo()
Julia Version 1.12.1
Commit ba1e628ee49 (2025-10-17 13:02 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: macOS (arm64-apple-darwin24.0.0)
  CPU: 16 × Apple M3 Max
  WORD_SIZE: 64
  LLVM: libLLVM-18.1.7 (ORCJIT, apple-m3)
  GC: Built with stock GC
Threads: 12 default, 1 interactive, 12 GC (on 12 virtual cores)
Environment:
  JULIA_NUM_THREADS = 12
  JULIA_CONDAPKG_BACKEND = Null
  JULIA_PYTHONCALL_EXE = /opt/anaconda3/envs/ocean/bin/python

Additional context
I posted this issue to Julia's GitHub and it was suggested that this is a PythonCall bug.