linux-kernel - Re: [PATCH v2] lockdep: report name and key when look_up_lock

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Message-ID: <YyhI93taOenZMHrY@hirez.programming.kicks-ass.net>
Date:   Mon, 19 Sep 2022 12:48:23 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Boqun Feng <boqun.feng@...il.com>, Ingo Molnar <mingo@...hat.com>,
        Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] lockdep: report name and key when
 look_up_lock_class() got confused

On Mon, Sep 19, 2022 at 09:52:13AM +0900, Tetsuo Handa wrote:
> Printing this information will be helpful.
> 
>   ------------[ cut here ]------------
>   Looking for class "l2tp_sock" with key l2tp_socket_class, but found a different class "slock-AF_INET6" with the same key
>   WARNING: CPU: 1 PID: 14195 at kernel/locking/lockdep.c:940 look_up_lock_class+0xcc/0x140
>   Modules linked in:
>   CPU: 1 PID: 14195 Comm: a.out Not tainted 6.0.0-rc6-dirty #863
>   Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
>   RIP: 0010:look_up_lock_class+0xcc/0x140
> 
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

Urgh, you hitting that WARN enough times to want to improve it seems to
suggest your machine is quite sick.

Anyway, patch is ok I suppose.