[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Irit Katriel]

Change by Irit Katriel :


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resolution: duplicate -> wont fix

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[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Irit Katriel]

Change by Irit Katriel :


--
resolution:  -> duplicate
status: open -> closed
superseder:  -> Cygwin is unsupported - close all open issues and list them 
here.

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[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Irit Katriel]

Irit Katriel  added the comment:

Sorry I thought this was the same issue. 

Note that asyncore is deprecated now.

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resolution: out of date -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

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[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Erik Bray]

Erik Bray  added the comment:

To my knowledge this issue is *not* fixed upstream.  However, my PR no doubt 
needs rebasing.

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[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Irit Katriel]

Irit Katriel  added the comment:

See discussion on issue31885.

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nosy: +iritkatriel
resolution:  -> out of date
stage: patch review -> resolved
status: open -> closed

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[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Erik Bray]

Erik Bray  added the comment:

I originally opened this in https://bugs.python.org/issue29253 but then made a 
dupe of my own bug!  Anyways, there's a (nearly year old) pull request for it 
now.

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[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Erik Bray]

Change by Erik Bray :


--
keywords: +patch
pull_requests: +4115
stage:  -> patch review

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[issue31882] Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in Cygwin

[Erik Bray]

New submission from Erik Bray :

Some of the tests for asyncio and asyncore block forever on Cygwin, due to a 
known (and seemingly difficult to fix) bug [1] in Cygwin involving SO_PEERCRED 
on UNIX sockets.

SO_PEERCRED is a socket option that can be used to exchange file ownership info 
of the socket at the time the connection was established (specifically on UNIX 
sockets).  This feature is technically supported on Cygwin, but the effect of 
the bug is that if two sockets are opened on the same process (even without 
using socketpair()), the credential exchange protocol can cause connect() on 
the "client" socket to block unless the "server" socket is already listen()-ing.

This situation is not all that common in practice (it is not a problem if the 
"client" and "server" are separate processes).  But it does show up in the test 
suite in a number of places, since both sockets belong to the same process.

I have a patch to work around this and will post a PR shortly.

[1] https://cygwin.com/ml/cygwin/2017-01/msg00054.html

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messages: 305118
nosy: erik.bray
priority: normal
severity: normal
status: open
title: Cygwin: asyncio and asyncore test suites hang indefinitely due to bug in 
Cygwin
type: crash

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