New submission from Guoqiang Zhang :
If two threads use cPickle to load objects simultaneously, one thread may raise
an AttributeError. This problem is caused by the partially loaded module.
To reproduce, create a file 'foo.py':
import time
time.sleep(0.1)
class foo():
pass
Then in main.py:
import threading
import cPickle
threads = [threading.Thread(target=cPickle.loads, args=('cfoo\nfoo\np0\n.',))
for _ in range(2)]
[thread.start() for thread in threads]
[thread.join() for thread in threads]
Run main.py, there should be a crash:
Exception in thread Thread-2:
Traceback (most recent call last):
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py",
line 810, in __bootstrap_inner
self.run()
File
"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py",
line 763, in run
self.__target(*self.__args, **self.__kwargs)
AttributeError: 'module' object has no attribute 'foo'
--
components: Library (Lib)
messages: 321627
nosy: sangongs
priority: normal
severity: normal
status: open
title: cPickle may raise AttributeError when loading concurrently in threads
type: crash
versions: Python 2.7
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Python tracker
<https://bugs.python.org/issue34110>
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