Recursive traceback crashes Python Interpreter

@ronaldoussoren

BPO	42651
Nosy	@ronaldoussoren, @stestagg
Superseder	bpo-42500: crash with unbounded recursion in except statement

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-12-22.08:32:24.480>
created_at = <Date 2020-12-16.08:02:14.969>
labels = ['interpreter-core', '3.8', '3.9', '3.10', '3.7', 'type-crash']
title = 'Recursive traceback crashes  Python Interpreter'
updated_at = <Date 2020-12-22.08:32:24.480>
user = 'https://bugs.python.org/xxm'

bugs.python.org fields:

activity = <Date 2020-12-22.08:32:24.480>
actor = 'ronaldoussoren'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-22.08:32:24.480>
closer = 'ronaldoussoren'
components = ['Interpreter Core']
creation = <Date 2020-12-16.08:02:14.969>
creator = 'xxm'
dependencies = []
files = []
hgrepos = []
issue_num = 42651
keywords = []
message_count = 6.0
messages = ['383118', '383249', '383253', '383267', '383268', '383575']
nosy_count = 3.0
nosy_names = ['ronaldoussoren', 'xxm', 'stestagg']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = '42500'
type = 'crash'
url = 'https://bugs.python.org/issue42651'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

=================

import traceback

def foo():
  traceback.print_exc()
  foo() 
    
foo()

================

Try running the above program, the interpreter is crashed with the error message like the following:

Fatal Python error: Cannot recover from stack overflow.
NoneType: None
NoneType: None
NoneType: None
NoneType: None

...
NoneType: None

NoneType: None
NoneType: <unprintable NoneType object>
NoneType: None
NoneType: None
...
NoneType: None
NoneType: None
NoneType: None
Fatal Python error: _Py_CheckRecursiveCall: Cannot recover from stack overflow.
Python runtime state: initialized

Current thread 0x00007fab0bdda700 (most recent call first):
File "/usr/local/python310/lib/python3.10/traceback.py", line 155 in _some_str
File "/usr/local/python310/lib/python3.10/traceback.py", line 515 in __init__
File "/usr/local/python310/lib/python3.10/traceback.py", line 103 in print_exception
File "/usr/local/python310/lib/python3.10/traceback.py", line 163 in print_exc
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 4 in foo
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5 in foo
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5 in foo
...
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5 in foo
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5 in foo
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5 in foo
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5 in foo
...
Aborted (core dumped)

This might be related to bpo-42500

In issue#36272, they discuss a bug in logging module. They show an example which is similar as this one. So I think I think there might be a similar bug in traceback module.

Confirmed that bpo-42500 fixes this traceback, in commit 4e7a69b

Parent commit:

user@obsidian ~/t/f/cpython (master)> git checkout 93a0ef7
Note: switching to '93a0ef7'.
HEAD is now at 93a0ef7 Correct return type in Modules/_ssl.c::sslmodule_legacy (GH-23609)

user@obsidian ~/t/f/cpython ((93a0ef7…))> ../test.sh
+ make distclean
+ CFLAGS=-O0
+ ./configure --prefix=/home/user/prefix --exec-prefix=/home/user/prefix --cache-file=../config.cache --with-pydebug --without-ensurepip
+ CFLAGS=-O0
+ make -j8 install
/home/user/cpython/Lib/runpy.py:111: PendingDeprecationWarning: lib2to3 package is deprecated and may not be able to parse Python 3.10+
__import__(pkg_name)
/home/user/cpython/Lib/runpy.py:111: PendingDeprecationWarning: lib2to3 package is deprecated and may not be able to parse Python 3.10+
__import__(pkg_name)
++ realpath /home/user/prefix/include/python3.10d/
+ INCLUDE_DIR=/home/user/prefix/include/python3.10d
+ set +e
+ PYTHONHOME=/home/user/prefix
+ /home/user/prefix/bin/python3 ../test.py
NoneType: None
...
NoneType: None
Fatal Python error: _Py_CheckRecursiveCall: Cannot recover from stack overflow.
Python runtime state: initialized

Current thread 0x00007f483d4bd740 (most recent call first):
File "/home/user/prefix/lib/python3.10/traceback.py", line 165 in _some_str
File "/home/user/prefix/lib/python3.10/traceback.py", line 524 in __init__
File "/home/user/prefix/lib/python3.10/traceback.py", line 113 in print_exception
File "/home/user/prefix/lib/python3.10/traceback.py", line 173 in print_exc
File "/home/user/cpython/../test.py", line 4 in foo
...
../test.sh: line 33: 50081 Aborted (core dumped) PYTHONHOME=$PREFIX $EPREFIX/bin/python3 ../test.py
+ [[ 134 -eq 139 ]]
+ exit 0

After fix merged:

user@obsidian ~/t/f/cpython ((93a0ef76…)) [1]> git checkout 4e7a69bdb6
Previous HEAD position was 93a0ef7647 Correct return type in Modules/_ssl.c::sslmodule_legacy (GH-23609)
HEAD is now at 4e7a69bdb6 bpo-42500: Fix recursion in or after except (GH-23568)
user@obsidian ~/t/f/cpython ((4e7a69bd…))> ../test.sh
+ make distclean
+ CFLAGS=-O0
+ ./configure --prefix=/home/user/prefix --exec-prefix=/home/user/prefix --cache-file=../config.cache --with-pydebug --without-ensurepip
+ CFLAGS=-O0
+ make -j8 install
/home/user/cpython/Lib/runpy.py:111: PendingDeprecationWarning: lib2to3 package is deprecated and may not be able to parse Python 3.10+
  __import__(pkg_name)
/home/user/cpython/Lib/runpy.py:111: PendingDeprecationWarning: lib2to3 package is deprecated and may not be able to parse Python 3.10+
  __import__(pkg_name)
++ realpath /home/user/prefix/include/python3.10d/
+ INCLUDE_DIR=/home/user/prefix/include/python3.10d
+ set +e
+ PYTHONHOME=/home/user/prefix
+ /home/user/prefix/bin/python3 ../test.py
NoneType: None
...
NoneType: None
Traceback (most recent call last):
  File "/home/user/prefix/lib/python3.10/traceback.py", line 165, in _some_str
    return str(value)
RecursionError: maximum recursion depth exceeded while calling a Python object

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user/cpython/../test.py", line 7, in <module>
    foo()
  File "/home/user/cpython/../test.py", line 5, in foo
    foo() 
  File "/home/user/cpython/../test.py", line 5, in foo
    foo() 
  File "/home/user/cpython/../test.py", line 5, in foo
    foo() 
  [Previous line repeated 989 more times]
  File "/home/user/cpython/../test.py", line 4, in foo
    traceback.print_exc()
  File "/home/user/prefix/lib/python3.10/traceback.py", line 173, in print_exc
    print_exception(*sys.exc_info(), limit=limit, file=file, chain=chain)
  File "/home/user/prefix/lib/python3.10/traceback.py", line 113, in print_exception
    for line in TracebackException(
  File "/home/user/prefix/lib/python3.10/traceback.py", line 632, in format
    yield from self.format_exception_only()
  File "/home/user/prefix/lib/python3.10/traceback.py", line 580, in format_exception_only
    yield _format_final_exc_line(stype, self._str)
  File "/home/user/prefix/lib/python3.10/traceback.py", line 156, in _format_final_exc_line
    valuestr = _some_str(value)
  File "/home/user/prefix/lib/python3.10/traceback.py", line 167, in _some_str
    return '<unprintable %s object>' % type(value).__name__
RecursionError: maximum recursion depth exceeded while calling a Python object
+ [[ 1 -eq 139 ]]
+ exit 0

Sorry, previous should have read "Fixes the abort"

Thank you very much, looking forward to the new Python version.

Could you please kindly change the resolution into fixed and close this issue?

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Recursive traceback crashes Python Interpreter #86817

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Recursive traceback crashes Python Interpreter #86817

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xxm commented on Dec 16, 2020

ronaldoussoren commented on Dec 17, 2020

xxm commented on Dec 17, 2020

stestagg commented on Dec 17, 2020

stestagg commented on Dec 17, 2020

xxm commented on Dec 22, 2020

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