[New-bugs-announce] [issue42652] recursive in finally clause cause Python interpreter crash.

[Xinmeng Xia]

New submission from Xinmeng Xia <xiaxm at smail.nju.edu.cn>:

Considering the following two program,running the program 1 will get expected output: RecursionError 

program 1
===========================
import traceback

def foo():
	try:
		1/0
	except Exception as e:
		traceback.print_exc()
	finally:
		a = 1
	foo()	
		
foo()

==========================
-----------------------------------------------------------------------------------
ZeroDivisionError: division by zero
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 12, in <module>

  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10, in foo
    foo()	
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10, in foo
...
    foo()	
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10, in foo
    foo()	
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 7, in foo
    traceback.print_exc()
  File "/usr/lib/python3.5/traceback.py", line 159, in print_exc
    print_exception(*sys.exc_info(), limit=limit, file=file, chain=chain)
  File "/usr/lib/python3.5/traceback.py", line 100, in print_exception
    type(value), value, tb, limit=limit).format(chain=chain):
  File "/usr/lib/python3.5/traceback.py", line 474, in __init__
    capture_locals=capture_locals)
  File "/usr/lib/python3.5/traceback.py", line 358, in extract
    f.line
  File "/usr/lib/python3.5/traceback.py", line 282, in line
    self._line = linecache.getline(self.filename, self.lineno).strip()
  File "/usr/lib/python3.5/linecache.py", line 16, in getline
    lines = getlines(filename, module_globals)
  File "/usr/lib/python3.5/linecache.py", line 43, in getlines
    if len(entry) != 1:
RecursionError: maximum recursion depth exceeded in comparison
------------------------------------------------------------------------

However when moving foo() into finally clause, the interpreter crashes.

program 2
==========================
import traceback

def foo():
	try:
		1/0
	except Exception as e:
		traceback.print_exc()
	finally:
		a = 1
		foo()	
		
foo()

==========================  
-----------------------------------------------------------------------------
File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10 in foo
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero
Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 7, in foo
    traceback.print_exc()
  File "/usr/lib/python3.5/traceback.py", line 159, in print_exc
    print_exception(*sys.exc_info(), limit=limit, file=file, chain=chain)
  File "/usr/lib/python3.5/traceback.py", line 100, in print_exception
    type(value), value, tb, limit=limit).format(chain=chain):
  File "/usr/lib/python3.5/traceback.py", line 474, in __init__
    capture_locals=capture_locals)
  File "/usr/lib/python3.5/traceback.py", line 358, in extract
    f.line
  File "/usr/lib/python3.5/traceback.py", line 282, in line
    self._line = linecache.getline(self.filename, self.lineno).strip()
  File "/usr/lib/python3.5/linecache.py", line 16, in getline
    lines = getlines(filename, module_globals)
  File "/usr/lib/python3.5/linecache.py", line 43, in getlines
    if len(entry) != 1:
RecursionError: maximum recursion depth exceeded in comparison

During handling of the above exception, another exception occurred:


Traceback (most recent call last):
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 5, in foo
    1/0

  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10 in foo
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10 in foo
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10 in foo
...
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10 in foo
  File "/home/xxm/Desktop/nameChanging/myerror/test1.py", line 10 in foo
  ...
Aborted (core dumped)
-------------------------------------------------------------------------

----------
components: Interpreter Core
messages: 383125
nosy: xxm
priority: normal
severity: normal
status: open
title: recursive in finally clause cause Python interpreter crash.
type: crash
versions: Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42652>
_______________________________________