linux-kernel - Re: WARNING: at kernel/lockdep.c:690 __lock

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Date:	Thu, 20 Oct 2011 20:39:13 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Tejun Heo <tj@...nel.org>, Tejun Heo <htejun@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: WARNING: at kernel/lockdep.c:690 __lock_acquire+0x168/0x164b()

On Sat, Oct 15, 2011 at 03:32:32PM -0700, David Rientjes wrote:
> Could you try to revert f59de8992aa6 ("lockdep: Clear whole lockdep_map on 
> initialization") with this patch and see if it helps?  Thanks.
> ---
> diff --git a/kernel/lockdep.c b/kernel/lockdep.c
> --- a/kernel/lockdep.c
> +++ b/kernel/lockdep.c
> @@ -2874,7 +2874,10 @@ static int mark_lock(struct task_struct *curr, struct held_lock *this,
>  void lockdep_init_map(struct lockdep_map *lock, const char *name,
>  		      struct lock_class_key *key, int subclass)
>  {
> -	memset(lock, 0, sizeof(*lock));
> +	int i;
> +
> +	for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
> +		lock->class_cache[i] = NULL;
>  
>  #ifdef CONFIG_LOCK_STAT
>  	lock->cpu = raw_smp_processor_id();

FWIW,

the box has been running here with f59de8992aa6 reverted for a couple of
days now and no sign of the warning. I'll keep watching it but it looks
ok so far, so David, you could've nailed it.

Thanks.

-- 
Regards/Gruss,
    Boris.
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