netdev - [TEST] amt.sh flaking

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Message-ID: <20260105180712.46da1eb4@kernel.org>
Date: Mon, 5 Jan 2026 18:07:12 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Taehee Yoo <ap420073@...il.com>
Cc: netdev@...r.kernel.org
Subject: [TEST] amt.sh flaking

Hi Taehee!

After migration to netdev foundation machines the amt.sh test has
gotten a bit more flaky:

https://netdev.bots.linux.dev/contest.html?test=amt-sh

In fact it's the second most flaky test we have after txtimestamp.sh.

All the failures are on non-debug kernels, and look like this:

TAP version 13
1..1
# timeout set to 3600
# selftests: net: amt.sh
# 0.26 [+0.26] TEST: amt discovery                                                 [ OK ]
# 15.27 [+15.01] 2026/01/05 19:33:27 socat[4075] W exiting on signal 15
# 15.28 [+0.01] TEST: IPv4 amt multicast forwarding                                 [FAIL]
# 17.30 [+2.02] TEST: IPv6 amt multicast forwarding                                 [ OK ]
# 17.30 [+0.00] TEST: IPv4 amt traffic forwarding torture               ..........  [ OK ]
# 19.48 [+2.18] TEST: IPv6 amt traffic forwarding torture               ..........  [ OK ]
# 26.71 [+7.22] Some tests failed.
not ok 1 selftests: net: amt.sh # exit=1

FWIW the new setup is based on Fedora 43 with:

# cat /etc/systemd/network/99-default.link
[Match]
OriginalName=*

[Link]
NamePolicy=keep kernel database onboard slot path
AlternativeNamesPolicy=database onboard slot path mac
MACAddressPolicy=none