netdev - Re: [PATCH net] selftests: rtnetlink: fix addrlft test flakiness on power-saving systems

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Message-ID: <20250818183012.35f47956@kernel.org>
Date: Mon, 18 Aug 2025 18:30:12 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Hangbin Liu <liuhangbin@...il.com>
Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Eric
 Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Simon
 Horman <horms@...nel.org>, Shuah Khan <shuah@...nel.org>,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net] selftests: rtnetlink: fix addrlft test flakiness on
 power-saving systems

On Tue, 15 Jul 2025 04:34:59 +0000 Hangbin Liu wrote:
> Jakub reported that the rtnetlink test for the preferred lifetime of an
> address has become quite flaky. The issue started appearing around the 6.16
> merge window in May, and the test fails with:
> 
>     FAIL: preferred_lft addresses remaining
> 
> The flakiness might be related to power-saving behavior, as address
> expiration is handled by a "power-efficient" workqueue.
> 
> To address this, use slowwait to check more frequently whether the address
> still exists. This reduces the likelihood of the system entering a low-power
> state during the test, improving reliability.

It flaked again, after long time of being fine..

https://netdev-3.bots.linux.dev/vmksft-net/results/259361/15-rtnetlink-sh/stdout