linux-kernel - Re: linux-next: slab shrinkers: BUG at mm/list

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Date:	Tue, 18 Jun 2013 10:25:43 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Glauber Costa <glommer@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Chinner <david@...morbit.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: slab shrinkers: BUG at mm/list_lru.c:92

On Tue 18-06-13 10:26:24, Glauber Costa wrote:
[...]
> Which is obviously borked since I did not fix the other callers so to move I_FREEING
> after lru del.
> 
> Michal, would you mind testing the following patch?

I was about to start testing with inode_lru_isolate fix. I will give it
few runs and then test this one if it is still relevant.

> diff --git a/fs/inode.c b/fs/inode.c
> index 00b804e..48eafa6 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -419,6 +419,8 @@ void inode_add_lru(struct inode *inode)
>  
>  static void inode_lru_list_del(struct inode *inode)
>  {
> +	if (inode->i_state & I_FREEING)
> +		return;
>  
>  	if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru))
>  		this_cpu_dec(nr_unused);
> @@ -609,8 +611,8 @@ void evict_inodes(struct super_block *sb)
>  			continue;
>  		}
>  
> -		inode->i_state |= I_FREEING;
>  		inode_lru_list_del(inode);
> +		inode->i_state |= I_FREEING;
>  		spin_unlock(&inode->i_lock);
>  		list_add(&inode->i_lru, &dispose);
>  	}
> @@ -653,8 +655,8 @@ int invalidate_inodes(struct super_block *sb, bool kill_dirty)
>  			continue;
>  		}
>  
> -		inode->i_state |= I_FREEING;
>  		inode_lru_list_del(inode);
> +		inode->i_state |= I_FREEING;
>  		spin_unlock(&inode->i_lock);
>  		list_add(&inode->i_lru, &dispose);
>  	}
> @@ -1381,9 +1383,8 @@ static void iput_final(struct inode *inode)
>  		inode->i_state &= ~I_WILL_FREE;
>  	}
>  
> +	inode_lru_list_del(inode);
>  	inode->i_state |= I_FREEING;
> -	if (!list_empty(&inode->i_lru))
> -		inode_lru_list_del(inode);
>  	spin_unlock(&inode->i_lock);
>  
>  	evict(inode);


-- 
Michal Hocko
SUSE Labs
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