[ 3363.663530] 
[ 3363.663613] =======================================================
[ 3363.664571] [ INFO: possible circular locking dependency detected ]
[ 3363.665341] 2.6.22.1 #28
[ 3363.665676] -------------------------------------------------------
[ 3363.666322] ln/414 is trying to acquire lock:
[ 3363.666870]  (&(&ip->i_lock)->mr_lock/1){--..}, at: [<7830bb94>] xfs_ilock+0x54/0xa0
[ 3363.668425] 
[ 3363.668460] but task is already holding lock:
[ 3363.669096]  (&(&ip->i_lock)->mr_lock){----}, at: [<7830bb94>] xfs_ilock+0x54/0xa0
[ 3363.670150] 
[ 3363.670179] which lock already depends on the new lock.
[ 3363.670220] 
[ 3363.671041] 
[ 3363.671070] the existing dependency chain (in reverse order) is:
[ 3363.671838] 
[ 3363.671867] -> #1 (&(&ip->i_lock)->mr_lock){----}:
[ 3363.672753]        [<781490a5>] check_prev_add+0x155/0x270
[ 3363.673892]        [<78149262>] check_prevs_add+0xa2/0xe0
[ 3363.674936]        [<7814abed>] __lock_acquire+0x39d/0xbd0
[ 3363.676067]        [<7814ba29>] lock_acquire+0x69/0x90
[ 3363.677080]        [<78136dad>] down_write_nested+0x3d/0x60
[ 3363.678140]        [<7830bb94>] xfs_ilock+0x54/0xa0
[ 3363.679122]        [<7830b39b>] xfs_iget_core+0x40b/0x6b0
[ 3363.680149]        [<7830b74f>] xfs_iget+0x10f/0x140
[ 3363.681136]        [<78325ccd>] xfs_trans_iget+0x9d/0x130
[ 3363.682179]        [<7830d875>] xfs_ialloc+0xa5/0x4d0
[ 3363.683175]        [<78326704>] xfs_dir_ialloc+0x74/0x270
[ 3363.684206]        [<7832d2da>] xfs_mkdir+0x25a/0x640
[ 3363.685250]        [<783377b4>] xfs_vn_mknod+0x294/0x340
[ 3363.686285]        [<78337895>] xfs_vn_mkdir+0x15/0x20
[ 3363.687289]        [<78187539>] vfs_mkdir+0x99/0x130
[ 3363.688303]        [<7818765f>] sys_mkdirat+0x8f/0xd0
[ 3363.689295]        [<781876c0>] sys_mkdir+0x20/0x30
[ 3363.690270]        [<78102882>] syscall_call+0x7/0xb
[ 3363.691260]        [<ffffffff>] 0xffffffff
[ 3363.692408] 
[ 3363.692444] -> #0 (&(&ip->i_lock)->mr_lock/1){--..}:
[ 3363.693364]        [<78148f7e>] check_prev_add+0x2e/0x270
[ 3363.694421]        [<78149262>] check_prevs_add+0xa2/0xe0
[ 3363.695521]        [<7814abed>] __lock_acquire+0x39d/0xbd0
[ 3363.696571]        [<7814ba29>] lock_acquire+0x69/0x90
[ 3363.697587]        [<78136dad>] down_write_nested+0x3d/0x60
[ 3363.698639]        [<7830bb94>] xfs_ilock+0x54/0xa0
[ 3363.699629]        [<7832c781>] xfs_lock_inodes+0x141/0x160
[ 3363.700671]        [<7832cd92>] xfs_link+0x172/0x460
[ 3363.701654]        [<7833796b>] xfs_vn_link+0x3b/0x90
[ 3363.702656]        [<78187eb6>] vfs_link+0x106/0x1b0
[ 3363.703643]        [<78188035>] sys_linkat+0xd5/0x100
[ 3363.704639]        [<78188090>] sys_link+0x30/0x40
[ 3363.705649]        [<78102882>] syscall_call+0x7/0xb
[ 3363.706640]        [<ffffffff>] 0xffffffff
[ 3363.707566] 
[ 3363.707596] other info that might help us debug this:
[ 3363.707636] 
[ 3363.708489] 3 locks held by ln/414:
[ 3363.708888]  #0:  (&inode->i_mutex/1){--..}, at: [<78187133>] lookup_create+0x23/0x80
[ 3363.710091]  #1:  (&inode->i_mutex){--..}, at: [<78504b8c>] mutex_lock+0x1c/0x20
[ 3363.711184]  #2:  (&(&ip->i_lock)->mr_lock){----}, at: [<7830bb94>] xfs_ilock+0x54/0xa0
[ 3363.712403] 
[ 3363.712433] stack backtrace:
[ 3363.712981]  [<78103c79>] show_trace_log_lvl+0x19/0x30
[ 3363.713647]  [<78103ca2>] show_trace+0x12/0x20
[ 3363.714215]  [<78103da4>] dump_stack+0x14/0x20
[ 3363.714781]  [<781488f8>] print_circular_bug_tail+0x68/0x70
[ 3363.715516]  [<78148f7e>] check_prev_add+0x2e/0x270
[ 3363.716133]  [<78149262>] check_prevs_add+0xa2/0xe0
[ 3363.716743]  [<7814abed>] __lock_acquire+0x39d/0xbd0
[ 3363.717374]  [<7814ba29>] lock_acquire+0x69/0x90
[ 3363.717965]  [<78136dad>] down_write_nested+0x3d/0x60
[ 3363.718593]  [<7830bb94>] xfs_ilock+0x54/0xa0
[ 3363.719165]  [<7832c781>] xfs_lock_inodes+0x141/0x160
[ 3363.719824]  [<7832cd92>] xfs_link+0x172/0x460
[ 3363.720421]  [<7833796b>] xfs_vn_link+0x3b/0x90
[ 3363.721034]  [<78187eb6>] vfs_link+0x106/0x1b0
[ 3363.721634]  [<78188035>] sys_linkat+0xd5/0x100
[ 3363.722240]  [<78188090>] sys_link+0x30/0x40
[ 3363.722821]  [<78102882>] syscall_call+0x7/0xb
[ 3363.723447]  =======================