linux-kernel - Re: cdbeb78c7a ("kernel/workqueue: Use dynamic lockdep keys for .."): WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:1002 lockdep_register

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Date:   Mon, 17 Dec 2018 09:32:57 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     kernel test robot <lkp@...el.com>
Cc:     LKP <lkp@...org>, linux-kernel@...r.kernel.org
Subject: Re: cdbeb78c7a ("kernel/workqueue: Use dynamic lockdep keys for
 .."):  WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:1002
 lockdep_register_key

On Mon, 2018-12-17 at 12:16 +0800, kernel test robot wrote:
> Greetings,
> 
> 0day kernel testing robot got the below dmesg and the first bad commit is
> 
> https://github.com/bvanassche/linux for-next
> 
> commit cdbeb78c7a2e34af6d6cc5d3570a585a23eea8e9
> Author:     Bart Van Assche <bvanassche@....org>
> AuthorDate: Fri Nov 9 09:53:31 2018 -0800
> Commit:     Bart Van Assche <bvanassche@....org>
> CommitDate: Fri Dec 14 11:24:37 2018 -0800
> 
>     kernel/workqueue: Use dynamic lockdep keys for workqueues
>     
>     [ ... ]
> 
> 60e521015c  locking/lockdep: Add support for dynamic keys
> cdbeb78c7a  kernel/workqueue: Use dynamic lockdep keys for workqueues
> 9294000d6d  IB/srp: Drain the send queue before destroying a QP
> +-----------------------------------------------------------+------------+------------+---------------------+
> >                                                           | 60e521015c | cdbeb78c7a | bvanassche/for-next |
> 
> +-----------------------------------------------------------+------------+------------+---------------------+
> > boot_successes                                            | 915        | 305        | 0                   |
> > boot_failures                                             | 1          | 7          | 310                 |
> > INFO:rcu_preempt_self-detected_stall_on_CPU               | 1          |            |                     |
> > EIP:smp_call_function_single                              | 1          |            |                     |
> > BUG:kernel_hang_in_boot-around-mounting-root_stage        | 1          |            |                     |
> > WARNING:at_kernel/locking/lockdep.c:#lockdep_register_key | 0          | 7          |                     |
> > EIP:lockdep_register_key                                  | 0          | 7          |                     |
> > WARNING:kernel_stack                                      | 0          | 0          | 310                 |
> 
> +-----------------------------------------------------------+------------+------------+---------------------+

The "WARNING:at_kernel/locking/lockdep.c:#lockdep_register_key" warnings have
already been removed from my branch so I think this report can be ignored.

Bart.