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3.14bugs and security fixesbugs and security fixes3.15new features, bugs and security fixesnew features, bugs and security fixestopic-subinterpreterstype-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump
Description
Crash report
What happened?
Minimal reproducer:
import _interpreters
_interpreters.create()
python -X tracemalloc subtest.py
This also fails if one submits a task to concurrent.futures.InterpreterPoolExecutor
.
Example output when run with -X tracemalloc
:
Python/tracemalloc.c:705: _Py_NegativeRefcount: Assertion failed: object has negative ref count
<object at 0x200041899d0 is freed>
Fatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed
Python runtime state: finalizing (tstate=0x0000559f74721680)
Stack (most recent call first):
<no Python frame>
Aborted (core dumped)
That points here:
Lines 701 to 706 in f478331
static void | |
tracemalloc_clear_filename(void *value) | |
{ | |
PyObject *filename = (PyObject *)value; | |
Py_DECREF(filename); | |
} |
I presume the issue is that the filename is not populated for the subinterpreter?
I'm on Ubuntu 24.04 on an x86_64 machine if that makes a difference. My latest configure command line is:
./configure --config-cache --with-pydebug --disable-gil CC=clang-20
Note that this also reproduces with the GIL enabled, (but it just outputs an unhelpful "segmentation fault").
CPython versions tested on:
CPython main branch
Operating systems tested on:
Linux
Output from running 'python -VV' on the command line:
Python 3.15.0a0 experimental free-threading build (heads/main:f478331f989, May 23 2025, 16:17:11) [Clang 20.1.5 (++20250430014901+ebfae55af454-1exp120250430014920.111)]
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3.14bugs and security fixesbugs and security fixes3.15new features, bugs and security fixesnew features, bugs and security fixestopic-subinterpreterstype-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump
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