3.13.0a4 SIGSEGV when calling next on a list-iterator in for that loops the same iterator #115733

hroncok · 2024-02-20T16:49:44Z

Bug report

Bug description:

EDIT smaller reproducer:

parts = iter([...] * 3)  # odd number of elements

for part in parts:
    next(parts, ...)

Hello, when we try to build Flask in Fedora with Python 3.13.0a4, we see a SIGSEGV. With @befeleme we've been able to isolate the failure to the following:

# reporducer.py

import flask
app = flask.Flask("flask_test")
app.config.update(TESTING=True)

@app.route("/")
def index():
    return "x"

with app.app_context():
    app.test_client().get("/")

$ sudo dnf --enablerepo=updates-testing install python3.13-debug
$ sudo dnf --enablerepo=updates-testing debuginfo-install python3.13

$ python3.13d --version
Python 3.13.0a4

$ python3.13d -m venv venv3.13d
$ . venv3.13d/bin/activate
(venv3.13d)$ pip install flask
...
(venv3.13d)$ pip list
Package      Version
------------ -------
blinker      1.7.0
click        8.1.7
Flask        3.0.2
itsdangerous 2.1.2
Jinja2       3.1.3
MarkupSafe   2.1.5
pip          23.2.1
Werkzeug     3.0.1

(venv3.13d)$ rm venv3.13d/lib64/python3.13/site-packages/markupsafe/_speedups.cpython-313-x86_64-linux-gnu.so  # to eliminate possibility of SIGSEGV in markupsafe

(venv3.13d)$ python -X dev reproducer.py
Fatal Python error: Segmentation fault

Current thread 0x00007f9445ba8740 (most recent call first):
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/urls.py", line 40 in _unquote_partial
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/urls.py", line 85 in uri_to_iri
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/sansio/utils.py", line 137 in get_current_url
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/wsgi.py", line 66 in get_current_url
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/test.py", line 944 in _add_cookies_to_wsgi
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/test.py", line 985 in run_wsgi_app
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/test.py", line 1114 in open
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/flask/testing.py", line 235 in open
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/test.py", line 1160 in get
  File "/tmp/reproducer.py", line 10 in <module>
Segmentation fault (core dumped)

Here's a bt from gdb:

(gdb) bt
#0  0x00007ffff7af344f in Py_TYPE (ob=0x0) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Include/object.h:333
#1  0x00007ffff7af3f7c in PyList_GET_SIZE (op=0x0) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Include/cpython/listobject.h:31
#2  0x00007ffff7b04e26 in _PyEval_EvalFrameDefault (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, frame=0x7ffff7fb8620, throwflag=0)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/generated_cases.c.h:2544
#3  0x00007ffff7af53d3 in _PyEval_EvalFrame (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, frame=0x7ffff7fb8120, throwflag=0)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Include/internal/pycore_ceval.h:115
#4  0x00007ffff7b25677 in _PyEval_Vector (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, func=0x7fffe8570b90, locals=0x0, args=0x7fffe88d8fd0, argcount=2, 
    kwnames=('method',)) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/ceval.c:1788
#5  0x00007ffff796cfe2 in _PyFunction_Vectorcall (func=<function at remote 0x7fffe8570b90>, stack=0x7fffe88d8fd0, nargsf=2, kwnames=('method',))
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Objects/call.c:413
#6  0x00007ffff7970daa in _PyObject_VectorcallTstate (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, callable=<function at remote 0x7fffe8570b90>, 
    args=0x7fffe88d8fd0, nargsf=2, kwnames=('method',)) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Include/internal/pycore_call.h:168
#7  0x00007ffff79714d6 in method_vectorcall (method=<method at remote 0x7fffe8dc0c50>, args=0x7fffe88d8fd8, nargsf=9223372036854775809, 
    kwnames=('method',)) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Objects/classobject.c:62
#8  0x00007ffff796ca02 in _PyVectorcall_Call (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, func=0x7ffff7971329 <method_vectorcall>, 
    callable=<method at remote 0x7fffe8dc0c50>, tuple=('/',), kwargs={'method': 'GET'})
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Objects/call.c:285
#9  0x00007ffff796cd00 in _PyObject_Call (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, callable=<method at remote 0x7fffe8dc0c50>, args=('/',), 
    kwargs={'method': 'GET'}) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Objects/call.c:348
#10 0x00007ffff796cddb in PyObject_Call (callable=<method at remote 0x7fffe8dc0c50>, args=('/',), kwargs={'method': 'GET'})
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Objects/call.c:373
#11 0x00007ffff7afdbbf in _PyEval_EvalFrameDefault (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, frame=0x7ffff7fb8098, throwflag=0)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/generated_cases.c.h:1250
#12 0x00007ffff7af53d3 in _PyEval_EvalFrame (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, frame=0x7ffff7fb8020, throwflag=0)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Include/internal/pycore_ceval.h:115
#13 0x00007ffff7b25677 in _PyEval_Vector (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, func=0x7fffe9d4dcd0, 
    locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated), args=0x0, 
    argcount=0, kwnames=0x0) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/ceval.c:1788
#14 0x00007ffff7af6edd in PyEval_EvalCode (co=<code at remote 0x5555555ece50>, 
    globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated), 
    locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated))
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/ceval.c:592
#15 0x00007ffff7bcd505 in run_eval_code_obj (tstate=0x7ffff7f2a8b8 <_PyRuntime+247704>, co=0x5555555ece50, 
    globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated), 
    locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated))
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/pythonrun.c:1294
#16 0x00007ffff7bcd8d5 in run_mod (mod=0x55555561ffd0, filename='/tmp/reproducer.py', 
    globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated), 
    locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated), 
    flags=0x7fffffffd318, arena=0x7fffe9daf700, interactive_src=0x0, generate_new_source=0)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/pythonrun.c:1379
#17 0x00007ffff7bcd2e2 in pyrun_file (fp=0x5555555851b0, filename='/tmp/reproducer.py', start=257, 
    globals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated), 
    locals={'__name__': '__main__', '__doc__': None, '__package__': None, '__loader__': <SourceFileLoader(name='__main__', path='/tmp/reproducer.py') at remote 0x7fffe9d60e20>, '__spec__': None, '__annotations__': {}, '__builtins__': <module at remote 0x7ffff74e3830>, '__file__': '/tmp/reproducer.py', '__cached__': None, 'flask': <module at remote 0x7fffe9dcc290>, 'app': <Flask(import_name='flask_test', _static_folder='static', _static_url_path=None, template_folder='templates', root_path='/tmp', cli=<AppGroup(name='flask_test', context_settings={}, callback=None, params=[], help=None, epilog=None, options_metavar='[OPTIONS]', short_help=None, add_help_option=True, no_args_is_help=True, hidden=False, deprecated=False, invoke_without_command=False, subcommand_metavar='COMMAND [ARGS]...', chain=False, _result_callback=None, commands={}) at remote 0x7fffe8709eb0>, view_functions={'static': <function at remote 0x7fffe8adb1d0>, 'index': <function at remote 0x7fffe87559d0>}, err...(truncated), closeit=1, 
    flags=0x7fffffffd318) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/pythonrun.c:1215
#18 0x00007ffff7bcb69d in _PyRun_SimpleFileObject (fp=0x5555555851b0, filename='/tmp/reproducer.py', closeit=1, flags=0x7fffffffd318)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/pythonrun.c:464
#19 0x00007ffff7bcaa1c in _PyRun_AnyFileObject (fp=0x5555555851b0, filename='/tmp/reproducer.py', closeit=1, flags=0x7fffffffd318)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Python/pythonrun.c:77
#20 0x00007ffff7c033cb in pymain_run_file_obj (program_name='/tmp/venv3.13d/bin/python', 
    filename='/tmp/reproducer.py', skip_source_first_line=0) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Modules/main.c:357
#21 0x00007ffff7c034a5 in pymain_run_file (config=0x7ffff7f05838 <_PyRuntime+96024>)
    at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Modules/main.c:376
#22 0x00007ffff7c03d17 in pymain_run_python (exitcode=0x7fffffffd4b4) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Modules/main.c:628
#23 0x00007ffff7c03e5c in Py_RunMain () at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Modules/main.c:707
#24 0x00007ffff7c03f32 in pymain_main (args=0x7fffffffd530) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Modules/main.c:737
#25 0x00007ffff7c03ffa in Py_BytesMain (argc=4, argv=0x7fffffffd6a8) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Modules/main.c:761
#26 0x000055555555517d in main (argc=4, argv=0x7fffffffd6a8) at /usr/src/debug/python3.13-3.13.0~a4-1.fc39.x86_64/Programs/python.c:15

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

gh-115733: Fix crash involving exhausted list iterator #115740

The text was updated successfully, but these errors were encountered:

hroncok · 2024-02-20T16:57:16Z

Flask-less reproducer with werkzeug only:

$ python -X dev -c 'import werkzeug; werkzeug.urls.uri_to_iri("/")'
Fatal Python error: Segmentation fault

Current thread 0x00007f61cf7bf740 (most recent call first):
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/urls.py", line 40 in _unquote_partial
  File "/tmp/venv3.13d/lib64/python3.13/site-packages/werkzeug/urls.py", line 85 in uri_to_iri
  File "<string>", line 1 in <module>
Segmentation fault (core dumped)

hroncok · 2024-02-20T17:07:24Z

Werkzeug-less reproducer:

parts = iter([...] * 3)  # odd number of elements

for part in parts:
    next(parts, ...)

hroncok · 2024-02-20T17:10:38Z

When the iterator is made from a tuple, it does not crash. If it has an even number of elements, it does not crash (only small integers tested).

hroncok · 2024-02-20T17:15:01Z

This example (from Python 3.12) shows why odd-number of elements matter:

>>> parts = iter([1,2,3,4,5])
>>> 
>>> for part in parts:
...     print('P', part)
...     print('N', next(parts, ...))
... 
P 1
N 2
P 3
N 4
P 5
N Ellipsis
>>> parts = iter([1,2,3,4])
>>> 
>>> for part in parts:
...     print('P', part)
...     print('N', next(parts, ...))
... 
P 1
N 2
P 3
N 4

hroncok · 2024-02-20T17:18:31Z

Reproduces on the current main branch.

hroncok · 2024-02-20T17:19:06Z

Reverting a2d4281 makes it not crash.

cc @corona10

AlexWaygood · 2024-02-20T17:25:18Z

One-liner:

Python 3.13.0a4+ (heads/main:d207c7cd5a, Feb 20 2024, 17:21:59) [Clang 15.0.0 (clang-1500.1.0.2.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> for part in (parts := iter([1])): next(parts, 1)
... 
1
[1]    29737 segmentation fault  ./python.exe

* gh-115733: Fix crash involving exhausted iterator * Add blurb

corona10 · 2024-02-20T20:20:13Z

@hroncok Now it should be fine with 520403e Can you please check?

hroncok · 2024-02-20T20:21:23Z

I was about to do that, but probably tmrw.

hroncok · 2024-02-21T11:04:38Z

All good. Thanks.

…ython#115740)

…115740) * pythongh-115733: Fix crash involving exhausted iterator * Add blurb

hroncok added the type-bug An unexpected behavior, bug, or error label Feb 20, 2024

AlexWaygood added type-crash A hard crash of the interpreter, possibly with a core dump 3.13 bugs and security fixes and removed type-bug An unexpected behavior, bug, or error labels Feb 20, 2024

hroncok changed the title ~~3.13.0a4 SIGSEGV in minimal Flask example~~ 3.13.0a4 SIGSEGV when calling next on an interator in for that loops the same iterator Feb 20, 2024

AlexWaygood added the release-blocker label Feb 20, 2024

hroncok changed the title ~~3.13.0a4 SIGSEGV when calling next on an interator in for that loops the same iterator~~ 3.13.0a4 SIGSEGV when calling next on a list-interator in for that loops the same iterator Feb 20, 2024

AlexWaygood added the topic-free-threading label Feb 20, 2024

Eclips4 changed the title ~~3.13.0a4 SIGSEGV when calling next on a list-interator in for that loops the same iterator~~ 3.13.0a4 SIGSEGV when calling next on a list-iterator in for that loops the same iterator Feb 20, 2024

colesbury added a commit to colesbury/cpython that referenced this issue Feb 20, 2024

pythongh-115733: Fix crash involving exhausted iterator

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gh-115733: Fix crash involving exhausted list iterator #115740

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corona10 pushed a commit that referenced this issue Feb 20, 2024

gh-115733: Fix crash involving exhausted list iterator (#115740)

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* gh-115733: Fix crash involving exhausted iterator * Add blurb

Eclips4 mentioned this issue Feb 20, 2024

Python crash when running Tools/c-analyzer/c-analyzer.py #115743

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hroncok closed this as completed Feb 21, 2024

befeleme pushed a commit to fedora-python/cpython that referenced this issue Feb 22, 2024

00421: pythongh-115733: Fix crash involving exhausted list iterator (p…

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…ython#115740)

woodruffw pushed a commit to woodruffw-forks/cpython that referenced this issue Mar 4, 2024

pythongh-115733: Fix crash involving exhausted list iterator (python#…

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…115740) * pythongh-115733: Fix crash involving exhausted iterator * Add blurb

diegorusso pushed a commit to diegorusso/cpython that referenced this issue Apr 17, 2024

pythongh-115733: Fix crash involving exhausted list iterator (python#…

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…115740) * pythongh-115733: Fix crash involving exhausted iterator * Add blurb

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3.13.0a4 SIGSEGV when calling next on a list-iterator in for that loops the same iterator #115733

3.13.0a4 SIGSEGV when calling next on a list-iterator in for that loops the same iterator #115733

hroncok commented Feb 20, 2024 •

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hroncok commented Feb 20, 2024 •

edited

hroncok commented Feb 20, 2024

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hroncok commented Feb 20, 2024

hroncok commented Feb 20, 2024

hroncok commented Feb 20, 2024

AlexWaygood commented Feb 20, 2024

corona10 commented Feb 20, 2024

hroncok commented Feb 20, 2024

hroncok commented Feb 21, 2024

3.13.0a4 SIGSEGV when calling next on a list-iterator in for that loops the same iterator #115733

3.13.0a4 SIGSEGV when calling next on a list-iterator in for that loops the same iterator #115733

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hroncok commented Feb 20, 2024 • edited by bedevere-app bot

Bug report

Bug description:

CPython versions tested on:

Operating systems tested on:

Linked PRs

hroncok commented Feb 20, 2024 • edited

hroncok commented Feb 20, 2024

hroncok commented Feb 20, 2024

hroncok commented Feb 20, 2024

hroncok commented Feb 20, 2024

hroncok commented Feb 20, 2024

AlexWaygood commented Feb 20, 2024

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hroncok commented Feb 20, 2024 •

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hroncok commented Feb 20, 2024 •

edited