From 0d34ac912c12c376555bb675c931f0f926124394 Mon Sep 17 00:00:00 2001
From: Victor Stinner <vstinner@python.org>
Date: Wed, 13 May 2026 16:55:45 +0200
Subject: [PATCH] gh-149776: Skip UDP Lite tests if it's not supported
 (#149777)

Fix test_socket on Linux kernel 7.1 and newer: skip UDP Lite tests if
it's not supported.

(cherry picked from commit 3cfc249e11a132dc69624150843779aa96c72b2b)
---
 Lib/test/test_socket.py                       | 21 ++++++++++++++++++-
 ...-05-13-14-53-23.gh-issue-149776.orqgsn.rst |  2 ++
 2 files changed, 22 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Tests/2026-05-13-14-53-23.gh-issue-149776.orqgsn.rst

diff --git a/Lib/test/test_socket.py b/Lib/test/test_socket.py
index 5ea8c8e62cdafd..85afb2369d63e4 100644
--- a/Lib/test/test_socket.py
+++ b/Lib/test/test_socket.py
@@ -145,6 +145,25 @@ def _have_socket_bluetooth():
     return True
 
 
+def _have_udp_lite():
+    if not hasattr(socket, "IPPROTO_UDPLITE"):
+        return False
+    # Older Android versions block UDPLITE with SELinux.
+    if support.is_android and platform.android_ver().api_level < 29:
+        return False
+
+    try:
+        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDPLITE)
+    except OSError as exc:
+        # Linux 7.1 removed UDP Lite support
+        if exc.errno == errno.EPROTONOSUPPORT:
+            return False
+        raise
+    sock.close()
+
+    return True
+
+
 @contextlib.contextmanager
 def socket_setdefaulttimeout(timeout):
     old_timeout = socket.getdefaulttimeout()
@@ -169,7 +188,7 @@ def socket_setdefaulttimeout(timeout):
 
 HAVE_SOCKET_VSOCK = _have_socket_vsock()
 
-HAVE_SOCKET_UDPLITE = hasattr(socket, "IPPROTO_UDPLITE")
+HAVE_SOCKET_UDPLITE = _have_udp_lite()
 
 HAVE_SOCKET_BLUETOOTH = _have_socket_bluetooth()
 
diff --git a/Misc/NEWS.d/next/Tests/2026-05-13-14-53-23.gh-issue-149776.orqgsn.rst b/Misc/NEWS.d/next/Tests/2026-05-13-14-53-23.gh-issue-149776.orqgsn.rst
new file mode 100644
index 00000000000000..e86a9130ff9bfb
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2026-05-13-14-53-23.gh-issue-149776.orqgsn.rst
@@ -0,0 +1,2 @@
+Fix test_socket on Linux kernel 7.1 and newer: skip UDP Lite tests if it's
+not supported. Patch by Victor Stinner.