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3.16.0a1 freethreading-debug build on i686: `test_destroy_subinterpreter_does_not_abort` triggers assertion in mimalloc · Issue #159462 · python/cpython · GitHub

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3.16.0a1 freethreading-debug build on i686: test_destroy_subinterpreter_does_not_abort triggers assertion in mimalloc #159462

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Description

Bug report

When building a freethreading debug Python 3.16.0a1 for Fedora Linux 46 on i686 architecture, test_destroy_subinterpreter_does_not_abort fails with SIGABRT.

The crashing assertion python: /builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/Objects/obmalloc.c:215: _PyMem_mi_page_reclaimed: Assertion tstate == (_PyThreadStateImpl *)_PyThreadState_GET()' failed. has already been dealt with: #153176 -- but probably not for 32bit arches?

Re-running test.test_free_threading.test_interpreters in verbose mode (matching: test_destroy_subinterpreter_does_not_abort)
test_destroy_subinterpreter_does_not_abort (test.test_free_threading.test_interpreters.InterpreterTeardownTests.test_destroy_subinterpreter_does_not_abort) ... FAIL
======================================================================
FAIL: test_destroy_subinterpreter_does_not_abort (test.test_free_threading.test_interpreters.InterpreterTeardownTests.test_destroy_subinterpreter_does_not_abort)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/Lib/test/test_free_threading/test_interpreters.py", line 25, in test_destroy_subinterpreter_does_not_abort
    script_helper.assert_python_ok('-c', script)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/Lib/test/support/script_helper.py", line 182, in assert_python_ok
    return _assert_python(True, *args, **env_vars)
  File "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/Lib/test/support/script_helper.py", line 167, in _assert_python
    res.fail(cmd_line)
    ~~~~~~~~^^^^^^^^^^
  File "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/Lib/test/support/script_helper.py", line 80, in fail
    raise AssertionError(f"Process return code is {exitcode}\n"
    ...<10 lines>...
                         f"---")
AssertionError: Process return code is -6 (SIGABRT)
command line: ['/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/python', '-X', 'faulthandler', '-I', '-c', '\nimport _testinternalcapi\n\ninterpid = _testinternalcapi.create_interpreter()\n_testinternalcapi.destroy_interpreter(interpid, basic=True)\n']
stdout:
---
---
stderr:
---
python: /builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/Objects/obmalloc.c:215: _PyMem_mi_page_reclaimed: Assertion `tstate == (_PyThreadStateImpl *)_PyThreadState_GET()' failed.
Fatal Python error: Aborted
<Cannot show all threads while the GIL is disabled>
Stack (most recent call first):
Current thread's C stack trace (most recent call first):
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at _Py_DumpStack+0x48 [0xf7d8736f]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x61158f [0xf7dad58f]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x611945 [0xf7dad945]
  Binary file "linux-gate.so.1", at __kernel_sigreturn+0x0 [0xf7f2a430]
  Binary file "linux-gate.so.1", at __kernel_vsyscall+0xc [0xf7f2a40c]
  Binary file "/lib/libc.so.6", at +0xb18bd [0xf763a8bd]
  Binary file "/lib/libc.so.6", at abort+0x34 [0xf761fdc2]
  Binary file "/lib/libc.so.6", at +0x97f71 [0xf7620f71]
  Binary file "/lib/libc.so.6", at __assert_fail+0xad [0xf7630ddd]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x3d44b2 [0xf7b704b2]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x3c8f6f [0xf7b64f6f]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x3cfc86 [0xf7b6bc86]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x3cfde5 [0xf7b6bde5]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x3c27f1 [0xf7b5e7f1]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x3c294b [0xf7b5e94b]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x5be3d9 [0xf7d5a3d9]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at PyThreadState_Clear+0x5da [0xf7d57911]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x5bbeb0 [0xf7d57eb0]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at Py_EndInterpreter+0x12c [0xf7d50827]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/build/lib.linux-i686-3.16/_testinternalcapi.cpython-316td-i386-linux-gnu.so", at +0x1ba52 [0xef187a52]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x3ab393 [0xf7b47393]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at _PyObject_MakeTpCall+0x23a [0xf7ab5e0c]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x319280 [0xf7ab5280]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at PyObject_Vectorcall+0x2f [0xf7ab61ae]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at _Py_VectorCallInstrumentation_StackRefSteal+0xb8 [0xf7c6c311]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at _PyEval_EvalFrameDefault+0xd11c [0xf7c7a31c]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x4cc824 [0xf7c68824]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x506a2a [0xf7ca2a2a]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at PyEval_EvalCode+0xe1 [0xf7c6bd45]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x5c26a0 [0xf7d5e6a0]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x5c2aa8 [0xf7d5eaa8]
  Binary file "/builddir/build/BUILD/python3.16-3.16.0_a1-build/Python-3.16.0a1/build/freethreading-debug/libpython3.16td.so.1.0", at +0x5c230d [0xf7d5e30d]
  <truncated rest of calls>
Extension modules: _testinternalcapi (total: 1)
---

CPython versions tested on:

3.16

Operating systems tested on:

Linux

Linked PRs

Activity

  1. self-assigned this
    on Oct 19, 2026
  2. added a commit that references this issue on Oct 20, 2026
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