=================
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 #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 4e7a69bdb6 

Parent commit:

user@obsidian ~/t/f/cpython (master)> git checkout  93a0ef7
Note: switching to '93a0ef7'.
HEAD is now at 93a0ef7647 Correct return type in Modules/_ssl.c::sslmodule_legacy (GH-23609)

user@obsidian ~/t/f/cpython ((93a0ef76…))> ../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?