Re: linux-next: slab shrinkers: BUG at mm/list_lru.c:92

[Michal Hocko]

And again, another hang. It looks like the inode deletion never
finishes. The good thing is that I do not see any LRU related BUG_ONs
anymore. I am going to test with the other patch in the thread.

2476 [<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0	<<< waiting for an inode to go away
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118525f>] iget_locked+0x4f/0x180
[<ffffffff811ef9e3>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a1c>] ext4_lookup+0xbc/0x160
[<ffffffff81174ad0>] lookup_real+0x20/0x60
[<ffffffff81177e25>] lookup_open+0x175/0x1d0
[<ffffffff8117815e>] do_last+0x2de/0x780			<<< holds i_mutex
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
11214 [<ffffffff81178144>] do_last+0x2c4/0x780			<<< blocked on i_mutex
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
11217 [<ffffffff81178144>] do_last+0x2c4/0x780			<<< blocked on i_mutex
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
11288 [<ffffffff81178144>] do_last+0x2c4/0x780			<<< blocked on i_mutex
[<ffffffff8117ae9a>] path_openat+0xda/0x400
[<ffffffff8117b303>] do_filp_open+0x43/0xa0
[<ffffffff81168ee0>] do_sys_open+0x160/0x1e0
[<ffffffff81168f9c>] sys_open+0x1c/0x20
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
11453 [<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118525f>] iget_locked+0x4f/0x180
[<ffffffff811ef9e3>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a1c>] 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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
12439 [<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118525f>] iget_locked+0x4f/0x180
[<ffffffff811ef9e3>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a1c>] 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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
12542 [<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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
12588 [<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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
12589 [<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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
13098 [<ffffffff8118325e>] __wait_on_freeing_inode+0x9e/0xc0
[<ffffffff81183321>] find_inode_fast+0xa1/0xc0
[<ffffffff8118525f>] iget_locked+0x4f/0x180
[<ffffffff811ef9e3>] ext4_iget+0x33/0x9f0
[<ffffffff811f6a1c>] 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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
19091 [<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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
19092 [<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
[<ffffffff81582fe9>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff
-- 
Michal Hocko
SUSE Labs
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