netdev - [TEST] so_peek_off flakes on new NIPA systems

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Message-ID: <20251124070722.1e828c53@kernel.org>
Date: Mon, 24 Nov 2025 07:07:22 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Kuniyuki Iwashima <kuniyu@...gle.com>
Cc: "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [TEST] so_peek_off flakes on new NIPA systems

Hi Kuniyuki!

We upgraded our system for NIPA recently to netdev foundation one 
(as you know). Looks like net/af_unix: so_peek_off is flaking
on both debug and non-debug builds quite a lot with:

# # so_peek_off.c:149:two_chunks_overlap_blocking:Expected -1 (-1) != bytes (-1)
# # two_chunks_overlap_blocking: Test terminated by assertion
# #          FAIL  so_peek_off.stream.two_chunks_overlap_blocking

https://netdev-ctrl.bots.linux.dev/logs/vmksft/net-dbg/results/399761/134-so-peek-off/stdout

The newer system is 10-20% faster it's also moved from AWS Linux to
Fedora. But I suspect the real reason is that our old system had
quietly broken compilation of af_unix selftests
because of Wflex-array-member-not-at-end which AWS Linux gcc doesn't
understand:

gcc: error: unrecognized command-line option ‘-Wflex-array-member-not-at-end’
make: *** [../../lib.mk:222: /home/virtme/testing/wt-1/tools/testing/selftests/net/af_unix/diag_uid] Error 1

So effectively we're been running some old copy of af_unix tests since
this flag was added.