[New-bugs-announce] [issue8333] test_multiprocessing: pickling failures

[Stefan Krah]

New submission from Stefan Krah <stefan-usenet at bytereef.org>:

On Windows/amd64, I get loads of pickling errors in test_multiprocessing.

Type 1 error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\stefan\svn\trunk\lib\multiprocessing\forking.py", line 347, in main
    self = load(from_parent)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 1378, in load
    return Unpickler(file).load()
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 858, in load
    dispatch[key](self)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 880, in load_eof
    raise EOFError
EOFError


Type 2 error:

======================================================================
ERROR: test_fork (__main__.WithManagerTestQueue)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "..\..\Lib\test\test_multiprocessing.py", line 485, in test_fork
    p.start()
  File "C:\Users\stefan\svn\trunk\lib\multiprocessing\process.py", line 104, in start
    self._popen = Popen(self)
  File "C:\Users\stefan\svn\trunk\lib\multiprocessing\forking.py", line 244, in __init__
    dump(process_obj, to_child, HIGHEST_PROTOCOL)
  File "C:\Users\stefan\svn\trunk\lib\multiprocessing\forking.py", line 167, in dump
    ForkingPickler(file, protocol).dump(obj)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 224, in dump
    self.save(obj)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 419, in save_reduce
    save(state)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 681, in _batch_setitems
    save(v)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Users\stefan\svn\trunk\lib\multiprocessing\forking.py", line 40, in dispatcher
    self.save_reduce(obj=obj, *rv)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 401, in save_reduce
    save(args)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 548, in save_tuple
    save(element)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 419, in save_reduce
    save(state)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 681, in _batch_setitems
    save(v)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 419, in save_reduce
    save(state)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 649, in save_dict
    self._batch_setitems(obj.iteritems())
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 681, in _batch_setitems
    save(v)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 331, in save
    self.save_reduce(obj=obj, *rv)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 396, in save_reduce
    save(cls)
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 286, in save
    f(self, obj) # Call unbound method with explicit self
  File "C:\Users\stefan\svn\trunk\lib\pickle.py", line 748, in save_global
    (obj, module, name))
PicklingError: Can't pickle <type 'cStringIO.StringO'>: it's not found as cStringIO.StringO

----------
components: Library (Lib)
messages: 102539
nosy: skrah
priority: high
severity: normal
stage: needs patch
status: open
title: test_multiprocessing: pickling failures
type: behavior
versions: Python 2.7

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8333>
_______________________________________