[issue21429] Input.output error with multiprocessing

[Florijan Hamzic]

Florijan Hamzic added the comment:

Hi,

i have a similiar issue:

i have a really simple scenario

Callee:
```
@classmethod
def MoveDataToOtherSide(cls, model)
data = {
"FirstName": model.FirstName,
"LastName": model.LastName,
"Email": model.Email,
"Pass": model.Password,
"Images": cls.LoadUserImages(model.ID)
}

p = Process(target=UserService.MoveProfileToOtherSide, kwargs={"data": 
data})
p.start()
```

Processeee
```
@staticmethod
def MoveProfileToOtherSide(data): requests.get("https://mySecretUrl.de";, 
params={"token": "secBlub", "data": encode(data, unpicklable=False)})
```

I think it has something todo with stdout but i have no clue how i could debug 
this further, unfortunetely. 

The Application around this functionality (UserService) is cherrypy.

--
nosy: +Florijan Hamzic

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[issue21429] Input.output error with multiprocessing

[Davin Potts]

Davin Potts added the comment:

Closing this stale issue as out of date with no response from OP since request 
months ago for enough info to be able to proceed.

--
resolution:  -> out of date
status: pending -> closed

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[issue21429] Input.output error with multiprocessing

[Davin Potts]

Changes by Davin Potts :


--
status: open -> pending

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[issue21429] Input.output error with multiprocessing

[Davin Potts]

Davin Potts added the comment:

The provided links to the relevant code are unfortunately pointing at the 
master branch's copy of those files and not a specific version of the code 
making it that much harder to now discern where the issue arises.  (A number of 
things have changed in the master branch since this issue was first reported.)

Can Mikaela or Valentin or others provide a minimal piece of code that can 
still reproduce the issue?

Without more information, it appears it will be very difficult to try to 
reproduce or effectively investigate this issue further.  If the issue is no 
longer reproducible, such an update would also very much be appreciated.

--
nosy: +davin

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[issue21429] Input.output error with multiprocessing

[ProgVal]

ProgVal added the comment:

The relevant piece of code: 
https://github.com/ProgVal/Limnoria/blob/master/plugins/Web/plugin.py#L85

commands.process is defined here: 
https://github.com/ProgVal/Limnoria/blob/master/src/commands.py#L76

callbacks.CommandProcess is defined at 
https://github.com/ProgVal/Limnoria/blob/master/src/callbacks.py#L1037 
(SupyThread is a small subclass of threading.Thread, which increments a count 
on initialization)

--
nosy: +Valentin.Lorentz
status: pending -> open

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[issue21429] Input.output error with multiprocessing

[Ezio Melotti]

Changes by Ezio Melotti :


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status: open -> pending

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[issue21429] Input.output error with multiprocessing

[Ezio Melotti]

Ezio Melotti added the comment:

Can you provide more information about the error (e.g. the relevant piece of 
code where the error generates, if you can reproduce it every time or if it's 
sporadic, a minimal piece of code that can reproduce the same issue, etc.)?
I would also suggest to report this to the supybot issue tracker if the 
affected code is not specific to Limnoria.

--
nosy: +ezio.melotti
type:  -> behavior

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[issue21429] Input.output error with multiprocessing

[Ned Deily]

Changes by Ned Deily :


--
nosy: +sbt

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[issue21429] Input.output error with multiprocessing

[Mikaela Suomalainen]

New submission from Mikaela Suomalainen:

I encountered this error with Limnoria and I was told to report it here.

```
ERROR 2014-05-04T18:04:04 supybot Uncaught exception in ['title'].
Traceback (most recent call last):
File 
"/home/users/mkaysi/.local/lib/python3.4/site-packages/supybot/callbacks.py", 
line 1266, in _callCommand
self.callCommand(command, irc, msg, *args, **kwargs)
File 
"/home/users/mkaysi/.local/lib/python3.4/site-packages/supybot/utils/python.py",
 line 91, in g
f(self, *args, **kwargs)
File 
"/home/users/mkaysi/.local/lib/python3.4/site-packages/supybot/callbacks.py", 
line 1247, in callCommand
method(irc, msg, *args, **kwargs)
File 
"/home/users/mkaysi/.local/lib/python3.4/site-packages/supybot/commands.py", 
line 1076, in newf
f(self, irc, msg, args, *state.args, **state.kwargs)
File 
"/home/users/mkaysi/.local/lib/python3.4/site-packages/supybot/plugins/Web/plugin.py",
 line 109, in newf
f(self, irc, *args, **kwargs)
File 
"/home/users/mkaysi/.local/lib/python3.4/site-packages/supybot/plugins/Web/plugin.py",
 line 96, in newf
pn=self.name(), cn=f.__name__)
File 
"/home/users/mkaysi/.local/lib/python3.4/site-packages/supybot/commands.py", 
line 120, in process
p.start()
File 
"/home/users/mkaysi/.pyenv/versions/3.4.0/lib/python3.4/multiprocessing/process.py",
 line 105, in start
self._popen = self._Popen(self)
File 
"/home/users/mkaysi/.pyenv/versions/3.4.0/lib/python3.4/multiprocessing/context.py",
 line 212, in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File 
"/home/users/mkaysi/.pyenv/versions/3.4.0/lib/python3.4/multiprocessing/context.py",
 line 267, in _Popen
return Popen(process_obj)
File 
"/home/users/mkaysi/.pyenv/versions/3.4.0/lib/python3.4/multiprocessing/popen_fork.py",
 line 18, in __init__
sys.stdout.flush()
OSError: [Errno 5] Input/output error
ERROR 2014-05-04T18:04:04 supybot Exception id: 0xaaefe
```

--
components: Library (Lib)
messages: 217880
nosy: mikaela
priority: normal
severity: normal
status: open
title: Input.output error with multiprocessing
versions: Python 3.4

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