linux-kernel - lock warnings in dev_addr

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Message-ID: <48c4d3db-66d5-4a9a-ab9e-9036db7222dc@roeck-us.net>
Date: Wed, 28 Feb 2024 11:45:00 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Jakub Kicinski <kuba@...nel.org>, Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Brendan Higgins <brendanhiggins@...gle.com>,
	David Gow <davidgow@...gle.com>, linux-kselftest@...r.kernel.org,
	kunit-dev@...glegroups.com
Subject: lock warnings in dev_addr_lists test

Hi,

when running the dev_addr_lists unit test with lock debugging enabled,
I always get the following lockdep warning.

[    7.031327] ====================================
[    7.031393] WARNING: kunit_try_catch/1886 still has locks held!
[    7.031478] 6.8.0-rc6-00053-g0fec7343edb5-dirty #1 Tainted: G        W        N
[    7.031728] ------------------------------------
[    7.031816] 1 lock held by kunit_try_catch/1886:
[    7.031896]  #0: ffffffff8ed35008 (rtnl_mutex){+.+.}-{3:3}, at: dev_addr_test_init+0x6a/0x100

Instrumentation shows that dev_addr_test_exit() is called, but only
after the warning fires.

Is this a problem with kunit tests or a problem with this specific test ?

Thanks,
Guenter