Messages in this thread | | | Date | Thu, 27 Jul 2006 16:51:29 +1000 | From | Nick Piggin <> | Subject | Re: [BUG?] possible recursive locking detected |
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Andrew Morton wrote: > On Wed, 26 Jul 2006 18:05:21 +0200 > Rolf Eike Beer <eike-kernel@sf-tec.de> wrote: > > >>Hi, >> >>I did some memory stress test (allocating and mlock()ing a huge number of >>pages) from userspace. At the very beginning of that I got that error long >>before the system got unresponsible and the oom killer dropped in. >> >>Eike >> >>============================================= >>[ INFO: possible recursive locking detected ] >>kded/5304 is trying to acquire lock: >> (&inode->i_mutex){--..}, at: [<c11f476e>] mutex_lock+0x21/0x24 >> >>but task is already holding lock: >> (&inode->i_mutex){--..}, at: [<c11f476e>] mutex_lock+0x21/0x24 >> >>other info that might help us debug this: >>3 locks held by kded/5304: >> #0: (&inode->i_mutex){--..}, at: [<c11f476e>] mutex_lock+0x21/0x24 >> #1: (shrinker_rwsem){----}, at: [<c1046312>] shrink_slab+0x25/0x136 >> #2: (&type->s_umount_key#14){----}, at: [<c106be2e>] prune_dcache+0xf6/0x144 >> >>stack backtrace: >> [<c1003aa9>] show_trace_log_lvl+0x54/0xfd >> [<c1004915>] show_trace+0xd/0x10 >> [<c100492f>] dump_stack+0x17/0x1c >> [<c102e0e1>] __lock_acquire+0x753/0x99c >> [<c102e5ac>] lock_acquire+0x4a/0x6a >> [<c11f4609>] __mutex_lock_slowpath+0xb0/0x1f4 >> [<c11f476e>] mutex_lock+0x21/0x24 >> [<f0854fc4>] ntfs_put_inode+0x3b/0x74 [ntfs] >> [<c106cf3f>] iput+0x33/0x6a >> [<c106b707>] dentry_iput+0x5b/0x73 >> [<c106bd15>] prune_one_dentry+0x56/0x79 >> [<c106be42>] prune_dcache+0x10a/0x144 >> [<c106be95>] shrink_dcache_memory+0x19/0x31 >> [<c10463bd>] shrink_slab+0xd0/0x136 >> [<c1047494>] try_to_free_pages+0x129/0x1d5 >> [<c1043d91>] __alloc_pages+0x18e/0x284 >> [<c104044b>] read_cache_page+0x59/0x131 >> [<c109e96f>] ext2_get_page+0x1c/0x1ff >> [<c109ebc4>] ext2_find_entry+0x72/0x139 >> [<c109ec99>] ext2_inode_by_name+0xe/0x2e >> [<c10a1cad>] ext2_lookup+0x1f/0x65 >> [<c1064661>] do_lookup+0xa0/0x134 >> [<c1064e9a>] __link_path_walk+0x7a5/0xbe4 >> [<c1065329>] link_path_walk+0x50/0xca >> [<c106586d>] do_path_lookup+0x212/0x25a >> [<c1065da9>] __user_walk_fd+0x2d/0x41 >> [<c10600bd>] vfs_stat_fd+0x19/0x40 >> [<c10600f5>] vfs_stat+0x11/0x13 >> [<c1060826>] sys_stat64+0x14/0x2a >> [<c1002845>] sysenter_past_esp+0x56/0x8d > > > We hold the ext2 directory mutex, and ntfs_put_inode is trying to take an > ntfs i_mutex. Not a deadlock as such, but it could become one in ntfs if > ntfs ever does a __GFP_WAIT allocation inside i_mutex, which it surely > does.
Though it should be using GFP_NOFS, right? So the dcache shrinker would not reenter the fs in that case.
I'm surprised ext2 is allocating with __GFP_FS set, though. Would that cause any problem?
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