Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

Appearance settings

GC crash in subtype_dealloc when inherting from _multiprocessing.SemLock #94736

Copy link
Copy link
Closed
@kumaraditya303

Description

@kumaraditya303
Issue body actions

Crash report

GC crash in subtype_dealloc when inherting from _multiprocessing.SemLock.

Reproducer (read carefully before running!):

from _multiprocessing import SemLock
class S(SemLock):
    pass


s = S(1, 1, 2, 'foo', 1)

Error messages

@kumaraditya303 ➜ /workspaces/cpython (main ✗) $ ./python main.py 
Segmentation fault (core dumped)

GDB backtrace:

#0  _PyObject_GC_UNTRACK (op=<S() at remote 0x7ffff778d480>, lineno=2242, 
    filename=0x5555559ae5dc "Modules/gcmodule.c") at ./Include/internal/pycore_object.h:174
#1  PyObject_GC_UnTrack (op_raw=0x7ffff778d480) at Modules/gcmodule.c:2242
#2  0x0000555555760e71 in subtype_dealloc (self=<S() at remote 0x7ffff778d480>)
    at Objects/typeobject.c:1368
#3  0x0000555555742e85 in _Py_Dealloc (op=<optimized out>) at Objects/object.c:2382
#4  0x0000555555726b1b in Py_DECREF (op=<optimized out>, lineno=609, 
    filename=0x55555591d5dd "./Include/object.h") at ./Include/object.h:533
#5  Py_XDECREF (op=<optimized out>) at ./Include/object.h:609
#6  free_keys_object (keys=keys@entry=0x7ffff777cf70) at Objects/dictobject.c:664
#7  0x0000555555727258 in dictkeys_decref (dk=0x7ffff777cf70) at Objects/dictobject.c:324
#8  dict_dealloc (mp=0x7ffff772d490) at Objects/dictobject.c:2378
#9  0x0000555555742e85 in _Py_Dealloc (op=<optimized out>) at Objects/object.c:2382
#10 0x000055555573f7e9 in Py_DECREF (op=<optimized out>, lineno=609, 
    filename=0x55555591d5dd "./Include/object.h") at ./Include/object.h:533
#11 Py_XDECREF (op=<optimized out>) at ./Include/object.h:609
#12 module_dealloc (m=0x7ffff772da30) at Objects/moduleobject.c:699
#13 0x0000555555742e85 in _Py_Dealloc (op=<optimized out>) at Objects/object.c:2382
#14 0x000055555572bca7 in Py_DECREF (op=<optimized out>, lineno=609, 

Your environment

  • CPython versions tested on: Python 3.12.0a0 da71751, Python 3.11.0b3+ f3212b1 on linux
  • Operating system and architecture: Linux 5.4.0-1074-azure x86_64

cc @pablogsal

Metadata

Metadata

Labels

3.10only security fixesonly security fixes3.11only security fixesonly security fixes3.12only security fixesonly security fixestype-crashA hard crash of the interpreter, possibly with a core dumpA hard crash of the interpreter, possibly with a core dump

Projects

No projects

Milestone

No milestone

Relationships

None yet

Development

No branches or pull requests

Issue actions

    Morty Proxy This is a proxified and sanitized view of the page, visit original site.