Got this during LTP's diotest1. Reproducable.
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.23-65a6ec0d72a07f16719e9b7a96e1c4bae044b591 #2
-------------------------------------------------------
diotest1/13563 is trying to acquire lock:
(&mm->mmap_sem){----}, at: [<c107a7b7>] dio_get_page+0x4b/0x16b
but task is already holding lock:
(jbd_handle){--..}, at: [<c1099b05>] journal_start+0xf3/0x120
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (jbd_handle){--..}:
[<c1033b14>] __lock_acquire+0x9b0/0xb7b
[<c1099b05>] journal_start+0xf3/0x120
[<c10581a2>] kmem_cache_alloc+0x67/0x9b
[<c10340a9>] lock_acquire+0x5f/0x77
[<c1099b05>] journal_start+0xf3/0x120
[<c1099b28>] journal_start+0x116/0x120
[<c1099b05>] journal_start+0xf3/0x120
[<c1090d6a>] ext3_dirty_inode+0x24/0x6d
[<c10581a2>] kmem_cache_alloc+0x67/0x9b
[<c10729b3>] __mark_inode_dirty+0x24/0x145
[<c101d2c2>] current_fs_time+0x13/0x15
[<c103e0bf>] generic_file_mmap+0x2a/0x3e
[<c104da6e>] mmap_region+0x200/0x3ee
[<c104df32>] do_mmap_pgoff+0x209/0x252
[<c1006a0f>] sys_mmap2+0x9d/0xb7
[<c10027de>] syscall_call+0x7/0xb
[<ffffffff>] 0xffffffff
-> #0 (&mm->mmap_sem){----}:
[<c1031966>] print_circular_bug_entry+0x40/0x46
[<c1033a04>] __lock_acquire+0x8a0/0xb7b
[<c1033137>] check_noncircular+0x57/0x84
[<c1056ecc>] check_bytes_and_report+0x26/0xb2
[<c1032e6f>] debug_check_no_locks_freed+0x134/0x13e
[<c10340a9>] lock_acquire+0x5f/0x77
[<c107a7b7>] dio_get_page+0x4b/0x16b
[<c102c2d8>] down_read+0x38/0x49
[<c107a7b7>] dio_get_page+0x4b/0x16b
[<c107a7b7>] dio_get_page+0x4b/0x16b
[<c10c0c1c>] __spin_lock_init+0x29/0x49
[<c107b2a3>] __blockdev_direct_IO+0x495/0xad4
[<c1032b41>] mark_held_locks+0x39/0x53
[<c1196f3d>] __mutex_unlock_slowpath+0x105/0x127
[<c1032d18>] trace_hardirqs_on+0x11a/0x13d
[<c1099b05>] journal_start+0xf3/0x120
[<c1099b28>] journal_start+0x116/0x120
[<c1090b81>] ext3_direct_IO+0xfa/0x18a
[<c108f296>] ext3_get_block+0x0/0xbe
[<c103f0fd>] generic_file_direct_IO+0xe5/0x116
[<c103f18a>] generic_file_direct_write+0x5c/0x138
[<c101d2c2>] current_fs_time+0x13/0x15
[<c103fbbe>] __generic_file_aio_write_nolock+0x378/0x4dc
[<c1032d18>] trace_hardirqs_on+0x11a/0x13d
[<c103fd67>] generic_file_aio_write+0x45/0xb8
[<c103fd7c>] generic_file_aio_write+0x5a/0xb8
[<c108cd94>] ext3_file_write+0x24/0x8f
[<c105af91>] do_sync_write+0xc7/0x10a
[<c1029231>] autoremove_wake_function+0x0/0x35
[<c102c39b>] up_read+0x14/0x29
[<c104d7c2>] do_brk+0x1ad/0x259
[<c105aeca>] do_sync_write+0x0/0x10a
[<c105b660>] vfs_write+0x74/0x95
[<c105baf1>] sys_write+0x41/0x67
[<c1002756>] sysenter_past_esp+0x5f/0xa5
[<ffffffff>] 0xffffffff
other info that might help us debug this:
2 locks held by diotest1/13563:
#0: (&type->i_mutex_key#3){--..}, at: [<c103fd67>]
generic_file_aio_write+0x45/0xb8
#1: (jbd_handle){--..}, at: [<c1099b05>] journal_start+0xf3/0x120
stack backtrace:
[<c1032269>] print_circular_bug_tail+0x5f/0x67
[<c1033a04>] __lock_acquire+0x8a0/0xb7b
[<c1033137>] check_noncircular+0x57/0x84
[<c1056ecc>] check_bytes_and_report+0x26/0xb2
[<c1032e6f>] debug_check_no_locks_freed+0x134/0x13e
[<c10340a9>] lock_acquire+0x5f/0x77
[<c107a7b7>] dio_get_page+0x4b/0x16b
[<c102c2d8>] down_read+0x38/0x49
[<c107a7b7>] dio_get_page+0x4b/0x16b
[<c107a7b7>] dio_get_page+0x4b/0x16b
[<c10c0c1c>] __spin_lock_init+0x29/0x49
[<c107b2a3>] __blockdev_direct_IO+0x495/0xad4
[<c1032b41>] mark_held_locks+0x39/0x53
[<c1196f3d>] __mutex_unlock_slowpath+0x105/0x127
[<c1032d18>] trace_hardirqs_on+0x11a/0x13d
[<c1099b05>] journal_start+0xf3/0x120
[<c1099b28>] journal_start+0x116/0x120
[<c1090b81>] ext3_direct_IO+0xfa/0x18a
[<c108f296>] ext3_get_block+0x0/0xbe
[<c103f0fd>] generic_file_direct_IO+0xe5/0x116
[<c103f18a>] generic_file_direct_write+0x5c/0x138
[<c101d2c2>] current_fs_time+0x13/0x15
[<c103fbbe>] __generic_file_aio_write_nolock+0x378/0x4dc
[<c1032d18>] trace_hardirqs_on+0x11a/0x13d
[<c103fd67>] generic_file_aio_write+0x45/0xb8
[<c103fd7c>] generic_file_aio_write+0x5a/0xb8
[<c108cd94>] ext3_file_write+0x24/0x8f
[<c105af91>] do_sync_write+0xc7/0x10a
[<c1029231>] autoremove_wake_function+0x0/0x35
[<c102c39b>] up_read+0x14/0x29
[<c104d7c2>] do_brk+0x1ad/0x259
[<c105aeca>] do_sync_write+0x0/0x10a
[<c105b660>] vfs_write+0x74/0x95
[<c105baf1>] sys_write+0x41/0x67
[<c1002756>] sysenter_past_esp+0x5f/0xa5
=======================
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