[Python-Dev] test_bind_port and test_find_unused_port fail due to missing SO_REUSEPORT when building Python 3.3.2-r2 (from portage) on 3.7.10-gentoo-r1 kernel

[Guido van Rossum]

Hi Reuben,

Thanks for reporting this. I've had a similar report recently in the Tulip
tracker (http://code.google.com/p/tulip/issues/detail?id=89). But the
problem seems with the use of SO_REUSEPORT in the test.support package's
bind_port() helper.

This really belongs in the Python issue tracker (bugs.python.org) -- can
you submit a bug there? My hunch is that, because this seems to be a
relatively new feature, we should just catch and ignore the exception from
that specific call.

--Guido


On Tue, Dec 3, 2013 at 7:24 AM, Reuben Garrett <reubengarrett at gmail.com>wrote:

> Greetings, learned Python devs!
>
> Apologies in advance if my message is misdirected. I'm building Python
> 3.3.2-r2 from Gentoo's Portage tree [1] and encountered two failed tests
> which probably should not have been attempted on my OS (Gentoo 3.7.10):
> test_bind_port and test_find_unused_port both use the SO_REUSEPORT socket
> option which, to the best of my knowledge is only available since kernel
> version 3.9. I was able to build by skipping the tests — but I believe the
> tests are there for a reason, and it would be best if a test that is known
> to fail should be skipped (or replaced with a fallback that is likely to
> succeed). Issue # 16594 [3] may be related (not sure).
>
> Is it possible to detect the kernel version and skip (or modify) these
> tests if SO_REUSEPORT is not available? If I'm missing something obvious
> (or should be reporting this elsewhere), please educate me so I can better
> respect your attention next time around :]
>
>
> +=== excerpt of portage build log:
> ======================================================================
> ERROR: test_bind_port (test.test_support.TestSupport)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File
> "/var/tmp/portage/dev-lang/python-3.3.2-r2/work/Python-3.3.2/Lib/test/test_support.py",
> line 87, in test_bind_port
>     support.bind_port(s)
>   File
> "/var/tmp/portage/dev-lang/python-3.3.2-r2/work/Python-3.3.2/Lib/test/support.py",
> line 548, in bind_port
>     if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
> OSError: [Errno 92] Protocol not available
>
> ======================================================================
> ERROR: test_find_unused_port (test.test_support.TestSupport)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
>   File
> "/var/tmp/portage/dev-lang/python-3.3.2-r2/work/Python-3.3.2/Lib/test/test_support.py",
> line 80, in test_find_unused_port
>     port = support.find_unused_port()
>   File
> "/var/tmp/portage/dev-lang/python-3.3.2-r2/work/Python-3.3.2/Lib/test/support.py",
> line 522, in find_unused_port
>     port = bind_port(tempsock)
>   File
> "/var/tmp/portage/dev-lang/python-3.3.2-r2/work/Python-3.3.2/Lib/test/support.py",
> line 548, in bind_port
>     if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
> OSError: [Errno 92] Protocol not available
> ===+
>
> [1]: https://packages.gentoo.org/package/dev-lang/python
> [2]: https://lwn.net/Articles/542629/
> [3]: http://bugs.python.org/issue16594
>
> --
> Best regards,
> Reuben Garrett
>
>
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>


-- 
--Guido van Rossum (python.org/~guido)
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