2.6.17-rc6-mm1 -- BUG: possible circular locking deadlock detected!

[Miles Lane]

=====================================================
[ BUG: possible circular locking deadlock detected! ]
-----------------------------------------------------
mount/1219 is trying to acquire lock:
(&ni->mrec_lock){--..}, at: [<c031e4b8>] mutex_lock+0x21/0x24

but task is already holding lock:
(&rl->lock){----}, at: [<f8a98e4d>] ntfs_map_runlist+0x2a/0xb5 [ntfs]

which lock already depends on the new lock,
which could lead to circular deadlocks!

the existing dependency chain (in reverse order) is:

-> #1 (&rl->lock){----}:
      [<c012ec64>] lock_acquire+0x58/0x74
      [<f8a97619>] ntfs_readpage+0x362/0x8fd [ntfs]
      [<c01415b0>] read_cache_page+0x8c/0x137
      [<f8a9eeb8>] map_mft_record+0xd7/0x1d2 [ntfs]
      [<f8a9d661>] ntfs_read_locked_inode+0x74/0xea9 [ntfs]
      [<f8a9eabb>] ntfs_read_inode_mount+0x625/0x846 [ntfs]
      [<f8aa2ff8>] ntfs_fill_super+0x8ca/0xd14 [ntfs]
      [<c01647c4>] get_sb_bdev+0xed/0x14e
      [<f8aa15ef>] ntfs_get_sb+0x10/0x12 [ntfs]
      [<c0163c11>] vfs_kern_mount+0x76/0x143
      [<c0163d17>] do_kern_mount+0x29/0x3d
      [<c0177f9f>] do_mount+0x78a/0x7e4
      [<c0178058>] sys_mount+0x5f/0x91
      [<c031fb5d>] sysenter_past_esp+0x56/0x8d

-> #0 (&ni->mrec_lock){--..}:
      [<c012ec64>] lock_acquire+0x58/0x74
      [<c031e321>] __mutex_lock_slowpath+0xa7/0x21d
      [<c031e4b8>] mutex_lock+0x21/0x24
      [<f8a9edfa>] map_mft_record+0x19/0x1d2 [ntfs]
      [<f8a98630>] ntfs_map_runlist_nolock+0x48/0x437 [ntfs]
      [<f8a98eaa>] ntfs_map_runlist+0x87/0xb5 [ntfs]
      [<f8a97739>] ntfs_readpage+0x482/0x8fd [ntfs]
      [<c01415b0>] read_cache_page+0x8c/0x137
      [<f8aa20bc>] load_system_files+0x155/0x7c7 [ntfs]
      [<f8aa30a7>] ntfs_fill_super+0x979/0xd14 [ntfs]
      [<c01647c4>] get_sb_bdev+0xed/0x14e
      [<f8aa15ef>] ntfs_get_sb+0x10/0x12 [ntfs]
      [<c0163c11>] vfs_kern_mount+0x76/0x143
      [<c0163d17>] do_kern_mount+0x29/0x3d
      [<c0177f9f>] do_mount+0x78a/0x7e4
      [<c0178058>] sys_mount+0x5f/0x91
      [<c031fb5d>] sysenter_past_esp+0x56/0x8d

other info that might help us debug this:

2 locks held by mount/1219:
#0:  (&s->s_umount#18){--..}, at: [<c0164443>] sget+0x223/0x3a1
#1:  (&rl->lock){----}, at: [<f8a98e4d>] ntfs_map_runlist+0x2a/0xb5 [ntfs]

stack backtrace:
[<c0103924>] show_trace_log_lvl+0x54/0xfd
[<c01049a9>] show_trace+0xd/0x10
[<c01049c3>] dump_stack+0x17/0x1c
[<c012cefb>] print_circular_bug_tail+0x59/0x64
[<c012e766>] __lock_acquire+0x7c2/0x97a
[<c012ec64>] lock_acquire+0x58/0x74
[<c031e321>] __mutex_lock_slowpath+0xa7/0x21d
[<c031e4b8>] mutex_lock+0x21/0x24
[<f8a9edfa>] map_mft_record+0x19/0x1d2 [ntfs]
[<f8a98630>] ntfs_map_runlist_nolock+0x48/0x437 [ntfs]
[<f8a98eaa>] ntfs_map_runlist+0x87/0xb5 [ntfs]
[<f8a97739>] ntfs_readpage+0x482/0x8fd [ntfs]
[<c01415b0>] read_cache_page+0x8c/0x137
[<f8aa20bc>] load_system_files+0x155/0x7c7 [ntfs]
[<f8aa30a7>] ntfs_fill_super+0x979/0xd14 [ntfs]
[<c01647c4>] get_sb_bdev+0xed/0x14e
[<f8aa15ef>] ntfs_get_sb+0x10/0x12 [ntfs]
[<c0163c11>] vfs_kern_mount+0x76/0x143
[<c0163d17>] do_kern_mount+0x29/0x3d
[<c0177f9f>] do_mount+0x78a/0x7e4
[<c0178058>] sys_mount+0x5f/0x91
[<c031fb5d>] sysenter_past_esp+0x56/0x8d
NTFS volume version 3.1.
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