Bus error when calling .poll() on a closed Connection from multiprocessing.Pipe()

[amacleod]

BPO	5570
Nosy	@benjaminp, @mallyvai

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2009-03-30.16:11:45.281>
created_at = <Date 2009-03-26.19:08:50.032>
labels = ['extension-modules']
title = 'Bus error when calling .poll() on a closed Connection from multiprocessing.Pipe()'
updated_at = <Date 2009-03-30.16:11:45.253>
user = 'https://bugs.python.org/amacleod'

bugs.python.org fields:

activity = <Date 2009-03-30.16:11:45.253>
actor = 'jnoller'
assignee = 'jnoller'
closed = True
closed_date = <Date 2009-03-30.16:11:45.281>
closer = 'jnoller'
components = ['Extension Modules']
creation = <Date 2009-03-26.19:08:50.032>
creator = 'amacleod'
dependencies = []
files = []
hgrepos = []
issue_num = 5570
keywords = []
message_count = 6.0
messages = ['84197', '84200', '84202', '84205', '84206', '84573']
nosy_count = 4.0
nosy_names = ['benjamin.peterson', 'jnoller', 'amacleod', 'mallyvai']
pr_nums = []
priority = 'high'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue5570'
versions = ['Python 2.6']

[amacleod]

Python 2.6.1 (r261:67515, Mar 26 2009, 14:44:39) 
[GCC 4.2.4 (Ubuntu 4.2.4-1ubuntu3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from multiprocessing import Pipe
>>> a, b = Pipe()
>>> a.close()
>>> a.poll()
Bus error

amacleod@cthulhu:~$ uname -a
Linux cthulhu 2.6.24-23-generic #1 SMP Mon Jan 26 01:04:16 UTC 2009
x86_64 GNU/Linux

I'm running Ubuntu 8.04 LTS, and just installed Python 2.6.1, compiling
from source.

[mallyvai]

Python 2.6.1 (r261:67515, Mar 22 2009, 05:39:39) 
[GCC 4.2.4 (Ubuntu 4.2.4-1ubuntu4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from multiprocessing import Pipe
>>> a, b = Pipe()
>>> a.close()
>>> a.poll()
Segmentation fault

Seems like this should raise an exception.

uname -a:
Linux mememy 2.6.24-23-generic #1 SMP Thu Feb 5 15:00:25 UTC 2009 i686
GNU/Linux

Compiled Python 2.6.1 from source.

[jnoller]

See also:

http://svn.python.org/view?view=rev&revision=68768
http://bugs.python.org/issue3311

This was checked into trunk, I don't know if it was merged to 2.6.1

[jnoller]

OS/X, Python Trunk:

>>> from multiprocessing import Pipe
>>> a, b = Pipe()
>>> a.close()
>>> a.poll()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IOError: handle out of range in select()
>>> 

2.6.1 Does not have the fix (I can segfault it here too). Ben, are we
planning a 2.6.2?

[benjaminp]

2009/3/26 Jesse Noller <report@bugs.python.org>:

2.6.1 Does not have the fix (I can segfault it here too). Ben, are we
planning a 2.6.2?

Yes, I think around 3.1's release, but you'll have to ask Barry for sure.

[jnoller]

Merged back in CL 70721 on 26 maint