linux-kernel - inconsistent lock state

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Date:	Tue, 1 Jun 2010 12:13:22 +0200
From:	"Pedro M. López" <pmlopez@...timensaje.es>
To:	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: inconsistent lock state

=================================
[ INFO: inconsistent lock state ]
2.6.34 #1
---------------------------------
inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
kswapd0/227 [HC0[0]:SC0[0]:HE1:SE1] takes:
 (&(&ip->i_iolock)->mr_lock#2){++++?+}, at: [<ffffffff8112c11f>]
xfs_ilock+0x27/0x79 {RECLAIM_FS-ON-W} state was registered at:
  [<ffffffff810510f5>] mark_held_locks+0x52/0x70
  [<ffffffff81051198>] lockdep_trace_alloc+0x85/0x9f
  [<ffffffff81073db2>] __alloc_pages_nodemask+0x7b/0x5b5
  [<ffffffff8106f1e2>] grab_cache_page_write_begin+0x65/0xaa
  [<ffffffff810bfaaa>] block_write_begin+0x38/0xcd
  [<ffffffff81146f1f>] xfs_vm_write_begin+0x25/0x27
  [<ffffffff8106e140>] generic_file_buffered_write+0x114/0x271
  [<ffffffff8114aa31>] xfs_file_aio_write+0x4e1/0x70c
  [<ffffffff8109d187>] do_sync_write+0xc6/0x103
  [<ffffffff8109db5f>] vfs_write+0xad/0x172
  [<ffffffff8109dcdd>] sys_write+0x45/0x6c
  [<ffffffff81001f2b>] system_call_fastpath+0x16/0x1b
irq event stamp: 62175
hardirqs last  enabled at (62175): [<ffffffff8126fb03>]
_raw_spin_unlock_irqrestore+0x3a/0x60 hardirqs last disabled at
(62174): [<ffffffff8126f3a9>] _raw_spin_lock_irqsave+0x17/0x58 softirqs
last  enabled at (61572): [<ffffffff8103398d>] __do_softirq+0x127/0x13e
softirqs last disabled at (61543): [<ffffffff81002dcc>]
call_softirq+0x1c/0x28

other info that might help us debug this:
2 locks held by kswapd0/227:
 #0:  (shrinker_rwsem){++++..}, at: [<ffffffff810797f0>]
shrink_slab+0x38/0x144 #1:  (&xfs_mount_list_lock){++++.-}, at:
[<ffffffff811503fc>] xfs_reclaim_inode_shrink+0x35/0x128

stack backtrace:
Pid: 227, comm: kswapd0 Not tainted 2.6.34 #1
Call Trace:
 [<ffffffff81050b72>] print_usage_bug+0x1a4/0x1b5
 [<ffffffff8100c995>] ? save_stack_trace+0x2a/0x47
 [<ffffffff810516bc>] ? check_usage_forwards+0x0/0xcf
 [<ffffffff81050e6d>] mark_lock+0x2ea/0x520
 [<ffffffff81052b8a>] __lock_acquire+0x6c1/0x1607
 [<ffffffff8116820b>] ? radix_tree_delete+0xd1/0x1d0
 [<ffffffff81053b27>] lock_acquire+0x57/0x6d
 [<ffffffff8112c11f>] ? xfs_ilock+0x27/0x79
 [<ffffffff81046939>] down_write_nested+0x2a/0x4d
 [<ffffffff8112c11f>] ? xfs_ilock+0x27/0x79
 [<ffffffff8112c11f>] xfs_ilock+0x27/0x79
 [<ffffffff8112c2eb>] xfs_ireclaim+0x93/0xb1
 [<ffffffff8114f949>] xfs_reclaim_inode+0x1de/0x20a
 [<ffffffff81150299>] xfs_inode_ag_walk+0x8b/0xe6
 [<ffffffff8114f76b>] ? xfs_reclaim_inode+0x0/0x20a
 [<ffffffff81150374>] xfs_inode_ag_iterator+0x80/0xd3
 [<ffffffff8114f76b>] ? xfs_reclaim_inode+0x0/0x20a
 [<ffffffff81150428>] xfs_reclaim_inode_shrink+0x61/0x128
 [<ffffffff8107988b>] shrink_slab+0xd3/0x144
 [<ffffffff81079c61>] balance_pgdat+0x365/0x59b
 [<ffffffff81077908>] ? isolate_pages_global+0x0/0x212
 [<ffffffff8107a089>] kswapd+0x1f2/0x20f
 [<ffffffff81042e89>] ? autoremove_wake_function+0x0/0x34
 [<ffffffff8126fb24>] ? _raw_spin_unlock_irqrestore+0x5b/0x60
 [<ffffffff81079e97>] ? kswapd+0x0/0x20f
 [<ffffffff81042ac7>] kthread+0x7a/0x82
 [<ffffffff81002cd4>] kernel_thread_helper+0x4/0x10
 [<ffffffff8126ff40>] ? restore_args+0x0/0x30
 [<ffffffff81042a4d>] ? kthread+0x0/0x82
 [<ffffffff81002cd0>] ? kernel_thread_helper+0x0/0x10


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