socket.gethostbyname('sadflkjsasf.i.nvali.d') gives a TimeoutError instead of an IOError on Ubuntu 13.04, causing the test to fail.

% ./python -m unittest test.test_urllibnet
.E../home/barry/projects/python/cpython/Lib/test/test_urllibnet.py:94: DeprecationWarning: FancyURLopener style of invoking requests is deprecated. Use newer urlopen functions/methods
  open_url = urllib.request.FancyURLopener().open(URL)
.........
======================================================================
ERROR: test_bad_address (test.test_urllibnet.urlopenNetworkTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/barry/projects/python/cpython/Lib/test/test_urllibnet.py", line 118, in test_bad_address
    socket.gethostbyname(bogus_domain)
TimeoutError: [Errno 110] Connection timed out

----------------------------------------------------------------------
Ran 13 tests in 6.116s

FAILED (errors=1)

would be good to know if this is related to glibc-2.17, or not. There was a similiar issue ...

I can't see how this could be classed as a bug in Python.  An invalid domain should quickly return a DNS error on a correctly configured operating system, which is what the test is testing.  If this report came from less well know names, I'd just close the issue as invalid....

On Apr 16, 2013, at 03:26 PM, R. David Murray wrote:

>I can't see how this could be classed as a bug in Python.  An invalid domain
>should quickly return a DNS error on a correctly configured operating system,
>which is what the test is testing.  If this report came from less well know
>names, I'd just close the issue as invalid....

It may still be invalid (i.e. not a bug in Python), but I wanted to at least
record it in our tracker for reference.

OK, that makes sense.  I leave it to you to close, I guess.

I have the same problem. Reproduced via custom app and what's failing is:

getaddrinfo("some.invalid.address.here", NULL, &hints, &result);

And it's failing quickly. But the returned error is system error 110 (Connection timed out).

* A virtual machine inside same host - with Centos 6.3: getaddrinfo returns -2 (invalid host address). This seems to be the behaviour expected by Python.
* VM with Ubuntu 13.04 (vanilla live CD) - again 110 (Connection timed out).

Since vanilla live CD is affected: I suppose it's not supposed to be something specific to my OS config.

* Up-to-date Arch Linux: -2 - Name or service not known
* Fedora Live CD: -2 - Name or service not known

These are in general with more recent libraries/packages than Ubuntu 13.04. All evidences suggest that there is something abnormal with this Ubuntu release.

Reported the issue to Ubuntu: https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1198744

> ... that there is something abnormal with this Ubuntu release.

no, it is not.  This has nothing to do with Ubuntu, but is an upstream change introduced with glibc-2.17.  So you will see it on every system which is based on the glibc version.

see https://bugs.launchpad.net/bugs/1154599 for the complete discussion.

Apparently this has been fixed upstream in glibc:
http://sourceware.org/bugzilla/show_bug.cgi?id=15339
There's also a related discussion at http://sourceware.org/bugzilla/show_bug.cgi?id=15726

Barry, can this be closed?

Works here on 13.04.

Within this note https://sourceware.org/glibc/wiki/NameResolver about getaddrinfo():
"In case there was a *negative* answer it's unclear what should be returned."

FTR this got "fixed" (i.e. the timeout is ignored) in 3.3 (b17662fc41af) and default (6f8fef208958), but on 2.7.

I'm going to close this as invalid:

Python 3.3.2+ (3.3:247344a0d12e, Oct 18 2013, 13:14:59) 
[GCC 4.8.1] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from socket import *
>>> gethostbyname('in.val.id')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
socket.gaierror: [Errno -5] No address associated with hostname

Same goes for 2.7 and 3.4.