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test_socket tests fail with kernel lacking support for IPPROTO_UDPLITE #149078

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#149081
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test_socket tests fail with kernel lacking support for IPPROTO_UDPLITE#149078
#149081
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testsTests in the Lib/test dirtype-bugAn unexpected behavior, bug, or error

Description

@mcepl
mcepl
opened on Apr 27, 2026

Bug report

Bug description:

When running on the kernel without support for UDPLite, setup of tests (function clientSetUp) in test_socket fails:

self.cli = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDPLITE)

this command raises OSError.

CPython versions tested on:

3.14

Operating systems tested on:

Linux

Complete build logs

Linked PRs

Activity

  1. mcepl
    added
    type-bugAn unexpected behavior, bug, or error
    on Apr 27, 2026
  2. mcepl
    added 4 commits that reference this issue on Apr 27, 2026

    pythongh-149078: test_socket: verify runtime kernel support for UDPLite

    3bbc118

    pythongh-149078: test_socket: verify runtime kernel support for UDPLite

    78a5359

    pythongh-149078: test_socket: verify runtime kernel support for UDPLite

    5316c65

    pythongh-149078: test_socket: verify runtime kernel support for UDPLite

    ec03728
  3. StanFromIreland
    added
    testsTests in the Lib/test dir
    on Apr 28, 2026

  4. neek78 commented on May 1, 2026

    @neek78
    neek78
    on May 1, 2026
    Contributor

    Linux 7.0 appears to have removed UDPLITE all together -

    commit d6e0f04bf22d9b25b530c5e04f82664eac942719
Merge: 8f921f610054 14ce9a47c5b7
Author: Jakub Kicinski <kuba@kernel.org>
Date:   Fri Mar 13 18:57:48 2026 -0700

    Merge branch 'udp-retire-udp-lite'

    So this is going to come up a lot more.

  5. mcepl commented on May 4, 2026

    @mcepl
    mcepl
    on May 4, 2026
    ContributorAuthor

    Linux 7.0 appears to have removed UDPLITE all together -

    Of course, I am on openSUSE/Tumbleweed so we have:

    mitmanek~/b/m/mistral-vibe (git: factory)$ uname -a
Linux mitmanek.cepl.eu 7.0.2-1-default #1 SMP PREEMPT_DYNAMIC Tue Apr 28 04:27:33 UTC 2026 (46da294) x86_64 x86_64 x86_64 GNU/Linux
mitmanek~/b/m/mistral-vibe (git: factory)$

  6. xry111 commented on May 11, 2026

    @xry111
    xry111
    on May 11, 2026
    Contributor

    Linux 7.1 actually:

    git log v7.0..v7.1-rc1 | grep d6e0f04bf22d9b25b530c5e04f82664eac942719
commit d6e0f04bf22d9b25b530c5e04f82664eac942719

    I guess openSUSE emulated the removal with 7.0 by disabling UDPLite in the kernel configuration.

  7. thesamesam commented on Jun 29, 2026

    @thesamesam
    thesamesam
    on Jun 29, 2026
    Contributor

    There was a duplicate bug, it seems: #149776.

    Fixed by 3cfc249 (#149777).

  8. gentoo-bot
    added a commit that references this issue on Jul 22, 2026

    dev-lang/python: skip test_socket for 3.12

    ca2b6c5
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