[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Mark Lawrence]

Change by Mark Lawrence :


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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Floris Bruynooghe]

Floris Bruynooghe added the comment:

Oops, I've kicked the bruynooghe-solaris-csw buildslave and it should now be 
building again.  A bit disappointed that buildbot/twisted doesn't reconnect 
automatically though.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[R. David Murray]

R. David Murray added the comment:

buildbot does normally reconnect automatically, so something must be wrong 
somewhere if it didn't.  I do seem to remember a bug that caused the slave to 
occasionally get confused about its current status in certain unusual 
circumstances...perhaps that bug has not been fixed yet.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Mark Lawrence]

Mark Lawrence added the comment:

I'm guessing that this would have been resolved some time ago, am I correct?

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versions: +Python 3.4, Python 3.5 -Python 3.3

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[STINNER Victor]

STINNER Victor added the comment:

 I'm guessing that this would have been resolved some time ago, am I correct?

You should not guess but check last builds of SPARC Solaris 10 OpenCSW 3.x to 
see if the issue stil occurs.

http://buildbot.python.org/all/waterfall?category=3.x.stablecategory=3.x.unstable

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Mark Lawrence]

Mark Lawrence added the comment:

By following the link I finally get to see No current builds. Pending Build 
Requests: (Apr 30 15:07:05, waiting 1445 hrs, 32 mins, 26 secs).  Is there any 
way that I can tell from the display whether or not the failures are related to 
this issue?

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[koobs]

koobs added the comment:

Incase it helps at all, I'm seeing the test failure preparing for adding 
python33 to the FreeBSD ports tree. 

On FreeBSD 9.0-RELEASE-p3 (amd64), with /etc/hosts configured as follows:

::1 localhost.domain localhost
127.0.0.1   localhost.domain localhost

The following is returned:

 socket.getaddrinfo('localhost', 80, 0, socket.SOCK_STREAM, 0, 
 socket.AI_ADDRCONFIG)
[(2, 1, 6, '', ('127.0.0.1', 80)), (28, 1, 6, '', ('::1', 80, 0, 0))]


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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Floris Bruynooghe]

Floris Bruynooghe added the comment:

I have no issue with changing the buildhost's zone configuration if that's
the right thing to do. Just one more option. Is widening the expected errno
in the test a valid thing to do?

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Antoine Pitrou]

Antoine Pitrou added the comment:

 I wonder how other systems respond to [...]
 if all interfaces except for lo are down

On Mageia Linux 1:

 socket.getaddrinfo('localhost', 80, 0, socket.SOCK_STREAM, 0, 
 socket.AI_ADDRCONFIG)
Traceback (most recent call last):
  File stdin, line 1, in module
socket.gaierror: [Errno -5] No address associated with hostname

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Martin v . Löwis]

Martin v. Löwis added the comment:

Antoine: thanks for the report. I fear that this rules out using AI_ADDRCONFIG: 
IETF has managed to break it. This is really silly.

So I'm tempted to close this as won't fix. Comments? Build slaves would be 
required that a regular lookup of localhost matches the configured loopback 
addresses (which I feel is a reasonable operational requirement anyway).

Floris: another work around is to configure ::1 in your zone.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Floris Bruynooghe]

New submission from Floris Bruynooghe:

The SPARC Solaris 10 OpenCSW 3.x builder fails with

==
FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)
--
Traceback (most recent call last):
  File 
/export/home/buildbot/buildarea/3.x.bruynooghe-solaris-csw/build/Lib/test/test_socket.py,
 line 4101, in test_create_connection
self.assertEqual(cm.exception.errno, errno.ECONNREFUSED)
AssertionError: 128 != 146

Here 128 is ENETUNREACH

I think the issue here is that socket.create_connection iterates over the 
result of socket.getaddrinfo('localhost', port, 0, SOCK_STREAM) which returns 
[(2, 2, 0, '', ('127.0.0.1', 0)), (26, 2, 0, '', ('::1', 0, 0, 0))] on this 
host.

The first result is tried and returns ECONNREFUSED but then the second address 
is tried and this returns ENETUNREACH because this host has not IPv6 network 
configured.  And create_connection() raises the last exception it received.

If getaddrinfo() is called with the AI_ADDRCONFIG flag then it will only return 
the IPv4 version of localhost.

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components: Tests
messages: 167867
nosy: flub
priority: normal
severity: normal
status: open
title: FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)
type: behavior
versions: Python 3.3

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[R. David Murray]

R. David Murray added the comment:

But if getaddrinfo returns an IPv6 address, shouldn't a localhost connection on 
that address work?  It seems to me that a localhost connection failing when an 
IPv6 localhost address is returned is an OS configuration bug.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Floris Bruynooghe]

Floris Bruynooghe added the comment:

It was my understanding that this is what the AI_ADDRCONFIG flag is
for, if you don't use it you have no such guarantee.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[R. David Murray]

R. David Murray added the comment:

That sounds reasonable.  However, on my box that has an IPv6 address configured 
on lo, I get the same result with or without that flag:

loLink encap:Local Loopback  
  inet addr:127.0.0.1  Mask:255.0.0.0
  inet6 addr: ::1/128 Scope:Host
  UP LOOPBACK RUNNING  MTU:16436  Metric:1
  RX packets:48000 errors:0 dropped:0 overruns:0 frame:0
  TX packets:48000 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:0 
  RX bytes:3991442 (3.8 MiB)  TX bytes:3991442 (3.8 MiB)
 
Python 2.7.3 (default, Jun 19 2012, 16:12:47) 
[GCC 4.5.3] on linux2
Type help, copyright, credits or license for more information.
 import socket
 socket.getaddrinfo('localhost', 80, 0, socket.SOCK_STREAM, 0)
[(2, 1, 6, '', ('127.0.0.1', 80))]
 socket.getaddrinfo('localhost', 80, 0, socket.SOCK_STREAM, 0, 
 socket.AI_ADDRCONFIG)
[(2, 1, 6, '', ('127.0.0.1', 80))]

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Floris Bruynooghe]

Floris Bruynooghe added the comment:

I think this is influenced by what  you have in /etc/hosts.  On my
laptop I also have IPv6 loopback as well as an IPv6 link-local on
eth0.  But I have both 127.0.0.1 and ::1 in /etc/hosts as locahost.
With that configuration I get the same getaddrinfo results as on the
solaris host (which btw, has the same /etc/hosts configuration for
localhost, i.e. both IPv4  IPv6).  Basically I don't think loopback
and link-local addresses count as configured address for
getaddrinfo.

Btw, removing the ::1 localhost line from /etc/hosts on the solaris
host does fix the issue and gives the same results you show.  But I
don't think this is correct.  My linux laptop behaves exactly the same
as the solaris host here.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[STINNER Victor]

Changes by STINNER Victor victor.stin...@gmail.com:


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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Martin v . Löwis]

Martin v. Löwis added the comment:

I was about to say that I agree that AI_ADDRCONFIG should be used in 
create_connection. However, RFC 3493 deviates from RFC 2553 by stating

If the AI_ADDRCONFIG flag is specified, IPv4 addresses shall be
   returned only if an IPv4 address is configured on the local system,
   and IPv6 addresses shall be returned only if an IPv6 address is
   configured on the local system.  The loopback address is not
   considered for this case as valid as a configured address.


If this is taken literally, then it would not be possible to connect anymore to 
localhost if you have no IP address configured except for the loopback 
addresses - which in turn would make the test fail also (and would clearly be 
undesirable).

OSX clearly ignores that RFC - even with no IPv4 address configured, I get a 
result that includes 127.0.0.1. I wonder how other systems respond to 

socket.getaddrinfo('localhost', 80, 0, socket.SOCK_STREAM, 0, 
socket.AI_ADDRCONFIG)

if all interfaces except for lo are down (remember to reactivate the interfaces 
before posting a response to the bug tracker :-)

Any patch needs to be careful to use the flag only if available. Microsoft 
points out that the flag works only on Vista+. Not sure whether it just has no 
effect on XP, or makes the call fail.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[R. David Murray]

R. David Murray added the comment:

Hmm.  I wonder what is different on my (linux) box.  I have ::1 in /etc/hosts 
for localhost.

Regardless, it certainly wouldn't hurt to add the flag to the test.

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[Martin v . Löwis]

Martin v. Löwis added the comment:

David: I get the same on Linux as you, however, in the standard Debian 
installation, ::1 is *not* an address for localhost, only for ip6-localhost 
and ip6-loopback. Likewise, on Redhat, it seems that only localhost6 gives 
you ::1. What Linux distribution are you using?

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[issue15617] FAIL: test_create_connection (test.test_socket.NetworkConnectionNoServer)

[R. David Murray]

R. David Murray added the comment:

I see our previous messages crossed, I'm glad you investigated this more 
throughly than I did, since clearly just adding the flag could break things.

I'm using gentoo linux (gentoo stable on that particular machine).  I don't 
guarantee my /etc/hosts file is stock gentoo, but I think it is other than 
adding my host name to the localhost lines.

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