New submission from Mihai Rusu <di...@google.com>:
Hi
While working on some Python code I stumbled on a situation where the Python
process seems to hang indefinitely. Further debugging points to the following
conclusion: if there is a class that somehow manages to run into an infinite
recursion (properly detected by Python which raises the corresponding
RuntimeError) while Python is doing garbage collection (so the infinite
recursion has to be triggered from __del__ somehow) then Python hangs into an
infinite loop apparently retrying to call that __del__ indefinitely. The
described behavior happens ONLY when an infinite recursion is detected (ie if I
raise my own "RuntimeError" from __del__ then it just logs it and exits).
Program showing the problem:
class A(object):
def __init__(self):
raise Exception('init error')
self.m = 'Hello world'
def __del__(self):
#raise RuntimeError('my runtime error')
self.__del__()
def func():
h = A()
func()
$ python pyloop.py
Traceback (most recent call last):
File "pyloop.py", line 15, in <module>
func()
File "pyloop.py", line 13, in func
h = A()
File "pyloop.py", line 5, in __init__
raise Exception('init error')
Exception: init error
Exception RuntimeError: 'maximum recursion depth exceeded' in <bound method
A.__del__ of <__main__.A object at 0x17bb7d0>> ignored
Exception RuntimeError: 'maximum recursion depth exceeded' in <bound method
A.__del__ of <__main__.A object at 0x17bb7d0>> ignored
Exception RuntimeError: 'maximum recursion depth exceeded' in <bound method
A.__del__ of <__main__.A object at 0x17bb7d0>> ignored
Exception RuntimeError: 'maximum recursion depth exceeded' in <bound method
A.__del__ of <__main__.A object at 0x17bb7d0>> ignored
...
If I uncomment the line raising my RuntimeError instance from __del__ then the
exception is logged once and the program exits (as expected).
Please help, thanks.
----------
components: Interpreter Core
messages: 124896
nosy: Mihai.Rusu, gregory.p.smith
priority: normal
severity: normal
status: open
title: Infinite recursion while garbage collecting loops indefinitely
type: behavior
versions: Python 2.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10794>
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