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    Subjectlockdep warning with LTP dio test (v2.6.24-rc6-125-g5356f66)
    Setting: ltp-full-20071031, dio01 test on ext3 with Linus's latest tree.
    Kernel w/ SMP, preemption, and lockdep configured.

    Cheers,
    Erez.

    =======================================================
    [ INFO: possible circular locking dependency detected ]
    2.6.24-rc6 #83
    -------------------------------------------------------
    diotest1/2088 is trying to acquire lock:
    (&mm->mmap_sem){----}, at: [<c02778a2>] dio_get_page+0x4e/0x15d

    but task is already holding lock:
    (jbd_handle){--..}, at: [<c029c7c6>] journal_start+0xcb/0xf8

    which lock already depends on the new lock.


    the existing dependency chain (in reverse order) is:

    -> #1 (jbd_handle){--..}:
    [<c023068f>] __lock_acquire+0x9cc/0xb95
    [<c0230c2f>] lock_acquire+0x5f/0x78
    [<c029c7e9>] journal_start+0xee/0xf8
    [<c02959d6>] ext3_journal_start_sb+0x48/0x4a
    [<c029152b>] ext3_dirty_inode+0x27/0x6c
    [<c026f701>] __mark_inode_dirty+0x29/0x144
    [<c026817b>] touch_atime+0xb7/0xbc
    [<c023af6d>] generic_file_mmap+0x2d/0x42
    [<c024a5cc>] mmap_region+0x1e6/0x3b4
    [<c024aa6b>] do_mmap_pgoff+0x1fb/0x253
    [<c02067af>] sys_mmap2+0x9b/0xb5
    [<c020275e>] syscall_call+0x7/0xb
    [<ffffffff>] 0xffffffff

    -> #0 (&mm->mmap_sem){----}:
    [<c023057f>] __lock_acquire+0x8bc/0xb95
    [<c0230c2f>] lock_acquire+0x5f/0x78
    [<c0397d4f>] down_read+0x3a/0x4c
    [<c02778a2>] dio_get_page+0x4e/0x15d
    [<c0278352>] __blockdev_direct_IO+0x431/0xa81
    [<c0291318>] ext3_direct_IO+0x10c/0x1a1
    [<c023c091>] generic_file_direct_IO+0x124/0x139
    [<c023c0fc>] generic_file_direct_write+0x56/0x11c
    [<c023ca15>] __generic_file_aio_write_nolock+0x33d/0x489
    [<c023cbb9>] generic_file_aio_write+0x58/0xb6
    [<c028d4e3>] ext3_file_write+0x27/0x99
    [<c0256d0f>] do_sync_write+0xc5/0x102
    [<c0257463>] vfs_write+0x90/0x119
    [<c0257a25>] sys_write+0x3d/0x61
    [<c02026d6>] sysenter_past_esp+0x5f/0xa5
    [<ffffffff>] 0xffffffff

    other info that might help us debug this:

    2 locks held by diotest1/2088:
    #0: (&sb->s_type->i_mutex_key#6){--..}, at: [<c023cba6>] generic_file_aio_write+0x45/0xb6
    #1: (jbd_handle){--..}, at: [<c029c7c6>] journal_start+0xcb/0xf8

    stack backtrace:
    Pid: 2088, comm: diotest1 Not tainted 2.6.24-rc6 #83
    [<c020372b>] show_trace_log_lvl+0x1a/0x2f
    [<c02040b4>] show_trace+0x12/0x14
    [<c020498b>] dump_stack+0x6c/0x72
    [<c022ec9b>] print_circular_bug_tail+0x5f/0x68
    [<c023057f>] __lock_acquire+0x8bc/0xb95
    [<c0230c2f>] lock_acquire+0x5f/0x78
    [<c0397d4f>] down_read+0x3a/0x4c
    [<c02778a2>] dio_get_page+0x4e/0x15d
    [<c0278352>] __blockdev_direct_IO+0x431/0xa81
    [<c0291318>] ext3_direct_IO+0x10c/0x1a1
    [<c023c091>] generic_file_direct_IO+0x124/0x139
    [<c023c0fc>] generic_file_direct_write+0x56/0x11c
    [<c023ca15>] __generic_file_aio_write_nolock+0x33d/0x489
    [<c023cbb9>] generic_file_aio_write+0x58/0xb6
    [<c028d4e3>] ext3_file_write+0x27/0x99
    [<c0256d0f>] do_sync_write+0xc5/0x102
    [<c0257463>] vfs_write+0x90/0x119
    [<c0257a25>] sys_write+0x3d/0x61
    [<c02026d6>] sysenter_past_esp+0x5f/0xa5
    =======================


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