Re: linux-next: slab shrinkers: BUG at mm/list_lru.c:92
From: Michal Hocko
Date: Wed Jun 19 2013 - 03:13:52 EST
On Tue 18-06-13 10:26:24, Glauber Costa wrote:
[...]
> Michal, would you mind testing the following patch?
>
> 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);
No luck. I have this on top of inode_lru_isolate one but still can see
hangs:
911 [<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118529f>] iget_locked+0x4f/0x180
[<ffffffff811efa23>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a5c>] ext4_lookup+0xbc/0x160
[<ffffffff81174ad0>] lookup_real+0x20/0x60
[<ffffffff81175254>] __lookup_hash+0x34/0x40
[<ffffffff81179872>] path_lookupat+0x7a2/0x830
[<ffffffff81179933>] filename_lookup+0x33/0xd0
[<ffffffff8117ab0b>] user_path_at_empty+0x7b/0xb0
[<ffffffff8117ab4c>] user_path_at+0xc/0x10
[<ffffffff8116ff91>] vfs_fstatat+0x51/0xb0
[<ffffffff81170116>] vfs_stat+0x16/0x20
[<ffffffff8117013f>] sys_newstat+0x1f/0x50
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
21409 [<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118529f>] iget_locked+0x4f/0x180
[<ffffffff811efa23>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a5c>] ext4_lookup+0xbc/0x160
[<ffffffff81174ad0>] lookup_real+0x20/0x60
[<ffffffff81177e25>] lookup_open+0x175/0x1d0
[<ffffffff8117815e>] do_last+0x2de/0x780
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
21745 [<ffffffff81179862>] path_lookupat+0x792/0x830
[<ffffffff81179933>] filename_lookup+0x33/0xd0
[<ffffffff8117ab0b>] user_path_at_empty+0x7b/0xb0
[<ffffffff8117ab4c>] user_path_at+0xc/0x10
[<ffffffff8116ff91>] vfs_fstatat+0x51/0xb0
[<ffffffff81170116>] vfs_stat+0x16/0x20
[<ffffffff8117013f>] sys_newstat+0x1f/0x50
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
22032 [<ffffffff81179862>] path_lookupat+0x792/0x830
[<ffffffff81179933>] filename_lookup+0x33/0xd0
[<ffffffff8117ab0b>] user_path_at_empty+0x7b/0xb0
[<ffffffff8117ab4c>] user_path_at+0xc/0x10
[<ffffffff8116ff91>] vfs_fstatat+0x51/0xb0
[<ffffffff81170116>] vfs_stat+0x16/0x20
[<ffffffff8117013f>] sys_newstat+0x1f/0x50
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
22621 [<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118529f>] iget_locked+0x4f/0x180
[<ffffffff811efa23>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a5c>] ext4_lookup+0xbc/0x160
[<ffffffff81174ad0>] lookup_real+0x20/0x60
[<ffffffff81177e25>] lookup_open+0x175/0x1d0
[<ffffffff8117815e>] do_last+0x2de/0x780
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
22711 [<ffffffff81178144>] do_last+0x2c4/0x780
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
22946 [<ffffffff81178144>] do_last+0x2c4/0x780
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
23393 [<ffffffff81178144>] do_last+0x2c4/0x780
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81583129>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
--
Michal Hocko
SUSE Labs
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