From 2eb9a81a7f73fb2582192547915a6c87dcd59574 Mon Sep 17 00:00:00 2001 From: Qingfang Deng Date: Wed, 3 Jun 2026 14:17:44 +0800 Subject: [PATCH] selftests: net: do not detect PPPoX loopback By default, pppd attempts to detect loopbacks on the underlying interface using a pseudo-randomly generated magic number and checks if the same value is received. The seed for the PRNG is a hash of hostname XOR current time XOR pid, which is likely to collide on NIPA, causing false positives. Disable magic number generation. Reported-by: Matthieu Baerts Fixes: 7af2a94f4dcf ("selftests: net: add tests for PPPoL2TP") Signed-off-by: Qingfang Deng Link: https://patch.msgid.link/20260603061746.23452-1-qingfang.deng@linux.dev Signed-off-by: Jakub Kicinski --- tools/testing/selftests/net/ppp/pppoe-server-options | 1 + 1 file changed, 1 insertion(+) diff --git a/tools/testing/selftests/net/ppp/pppoe-server-options b/tools/testing/selftests/net/ppp/pppoe-server-options index 66c8c9d319e9..cd586be7061b 100644 --- a/tools/testing/selftests/net/ppp/pppoe-server-options +++ b/tools/testing/selftests/net/ppp/pppoe-server-options @@ -1,2 +1,3 @@ noauth noipdefault +nomagic