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test_import_in_subinterpreter_concurrently RuntimeError: Subprocess failed with exit code -11. Code: ```python def test(): import sys sys.path.insert(0, '/home/runner/work/pybind11/pybind11/build/tests') import collections import mod_per_interpreter_gil_with_singleton as m objects = m.get_objects_in_singleton() expected = [ type(None), # static type: shared between interpreters tuple, # static type: shared between interpreters list, # static type: shared between interpreters dict, # static type: shared between interpreters collections.OrderedDict, # static type: shared between interpreters collections.defaultdict, # heap type: dynamically created per interpreter collections.deque, # heap type: dynamically created per interpreter ] # Check that we have the expected objects. Avoid IndexError by checking lengths first. assert len(objects) == len(expected), ( f"Expected {expected!r} ({len(expected)}), got {objects!r} ({len(objects)})." ) # The first ones are static types shared between interpreters. assert objects[:-2] == expected[:-2], ( f"Expected static objects {expected[:-2]!r}, got {objects[:-2]!r}." ) # The last two are heap types created per-interpreter. # The expected objects are dynamically imported from `collections`. assert objects[-2:] == expected[-2:], ( f"Expected heap objects {expected[-2:]!r}, got {objects[-2:]!r}." ) assert hasattr(m, 'MyClass'), "Module missing MyClass" assert hasattr(m, 'MyGlobalError'), "Module missing MyGlobalError" assert hasattr(m, 'MyLocalError'), "Module missing MyLocalError" assert hasattr(m, 'MyEnum'), "Module missing MyEnum" import gc from concurrent.futures import InterpreterPoolExecutor, as_completed futures = future = None with InterpreterPoolExecutor(max_workers=16) as executor: futures = [executor.submit(test) for _ in range(32)] for future in as_completed(futures): future.result() del futures, future, executor for _ in range(5): gc.collect() ``` Output: Fatal Python error: Segmentation fault <Cannot show all threads while the GIL is disabled> Stack (most recent call first): File "<string>", line 49 in <module> Current thread's C stack trace (most recent call first): Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at _Py_DumpStack+0x47 [0x7f41dd95cf54] Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at +0x16631f [0x7f41dd96631f] Binary file "/lib/x86_64-linux-gnu/libc.so.6", at +0x45330 [0x7f41dd445330] Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at _Py_Dealloc+0x1c [0x7f41dd9e894c] Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at PyDict_GetItemWithError+0xdd [0x7f41dd9df87d] Binary file "/home/runner/work/pybind11/pybind11/build/tests/mod_per_interpreter_gil_with_singleton.cpython-314t-x86_64-linux-gnu.so", at +0xccfb [0x7f41d892fcfb] Binary file "/home/runner/work/pybind11/pybind11/build/tests/mod_per_interpreter_gil_with_singleton.cpython-314t-x86_64-linux-gnu.so", at +0xd67e [0x7f41d893067e] Binary file "/home/runner/work/pybind11/pybind11/build/tests/mod_per_interpreter_gil_with_singleton.cpython-314t-x86_64-linux-gnu.so", at +0xedde [0x7f41d8931dde] Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at _Py_Dealloc+0x83 [0x7f41dd9e89b3] Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at +0x1fa81a [0x7f41dd9fa81a] Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at _Py_Dealloc+0x83 [0x7f41dd9e89b3] Binary file "/opt/hostedtoolcache/Python/3.14.2/x64-freethreaded/lib/libpython3.14t.so.1.0", at +0x2eff08 [0x7f41ddaeff08] Binary file "/opt/hostedtoolcache/Python/3

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