linux-kernel - Re: select_task_rq_fair: WARNING: at kernel/lockdep.c match_held

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Date:	Thu, 4 Aug 2011 18:53:47 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org
Subject: Re: select_task_rq_fair: WARNING: at kernel/lockdep.c match_held_lock

On (08/04/11 17:47), Peter Zijlstra wrote:
> On Thu, 2011-08-04 at 18:37 +0300, Sergey Senozhatsky wrote:
> > > > [  132.794685] WARNING: at kernel/lockdep.c:3117 match_held_lock+0xf6/0x12e()
> 
> Just to double check, that line is:
> 
>                 if (DEBUG_LOCKS_WARN_ON(!hlock->nest_lock))
> 
> in your kernel source?
> 

Nope, that's `if (DEBUG_LOCKS_WARN_ON(!class))'

3106 static int match_held_lock(struct held_lock *hlock, struct lockdep_map *lock)
3107 {                                                                                                                                                                                                                             
3108     if (hlock->instance == lock)
3109         return 1;
3110 
3111     if (hlock->references) {
3112         struct lock_class *class = lock->class_cache[0];
3113 
3114         if (!class)
3115             class = look_up_lock_class(lock, 0);
3116 
3117         if (DEBUG_LOCKS_WARN_ON(!class))
3118             return 0;
3119 
3120         if (DEBUG_LOCKS_WARN_ON(!hlock->nest_lock))
3121             return 0;
3122 
3123         if (hlock->class_idx == class - lock_classes + 1)
3124             return 1;
3125     }
3126 
3127     return 0;
3128 }
3129 


	Sergey
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