netdev - [PATCH net-next] selftests: rtnetlink: print device info on preferred

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Message-ID: <20250819074749.388064-1-liuhangbin@gmail.com>
Date: Tue, 19 Aug 2025 07:47:49 +0000
From: Hangbin Liu <liuhangbin@...il.com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>,
	Shuah Khan <shuah@...nel.org>,
	Florian Westphal <fw@...len.de>,
	linux-kselftest@...r.kernel.org,
	Hangbin Liu <liuhangbin@...il.com>
Subject: [PATCH net-next] selftests: rtnetlink: print device info on preferred_lft test failure

Even with slowwait used to avoid system sleep in the preferred_lft test,
failures can still occur after long runtimes.

Print the device address info when the test fails to provide better
troubleshooting data.

Signed-off-by: Hangbin Liu <liuhangbin@...il.com>
---
 tools/testing/selftests/net/rtnetlink.sh | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh
index d6c00efeb664..91b0f6cae04d 100755
--- a/tools/testing/selftests/net/rtnetlink.sh
+++ b/tools/testing/selftests/net/rtnetlink.sh
@@ -313,6 +313,8 @@ kci_test_addrlft()
 
 	slowwait 5 check_addr_not_exist "$devdummy" "10.23.11."
 	if [ $? -eq 1 ]; then
+		# troubleshoot the reason for our failure
+		run_cmd ip addr show dev "$devdummy"
 		check_err 1
 		end_test "FAIL: preferred_lft addresses remaining"
 		return
-- 
2.50.1