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    Subjectdio_get_page() lockdep complaints
    Hi,

    Doing some testing on CFQ, I ran into this 100% reproducible report:

    =======================================================
    [ INFO: possible circular locking dependency detected ]
    2.6.21-rc7 #5
    -------------------------------------------------------
    fio/9741 is trying to acquire lock:
    (&mm->mmap_sem){----}, at: [<b018cb34>] dio_get_page+0x54/0x161

    but task is already holding lock:
    (&inode->i_mutex){--..}, at: [<b038c6e5>] mutex_lock+0x1c/0x1f

    which lock already depends on the new lock.


    the existing dependency chain (in reverse order) is:

    -> #1 (&inode->i_mutex){--..}:
    [<b013e3fb>] __lock_acquire+0xdee/0xf9c
    [<b013e600>] lock_acquire+0x57/0x70
    [<b038c4a5>] __mutex_lock_slowpath+0x73/0x297
    [<b038c6e5>] mutex_lock+0x1c/0x1f
    [<b01b17e9>] reiserfs_file_release+0x54/0x447
    [<b016afe7>] __fput+0x53/0x101
    [<b016b0ee>] fput+0x19/0x1c
    [<b015bcd5>] remove_vma+0x3b/0x4d
    [<b015c659>] do_munmap+0x17f/0x1cf
    [<b015c6db>] sys_munmap+0x32/0x42
    [<b0103f04>] sysenter_past_esp+0x5d/0x99
    [<ffffffff>] 0xffffffff

    -> #0 (&mm->mmap_sem){----}:
    [<b013e259>] __lock_acquire+0xc4c/0xf9c
    [<b013e600>] lock_acquire+0x57/0x70
    [<b0137b92>] down_read+0x3a/0x4c
    [<b018cb34>] dio_get_page+0x54/0x161
    [<b018d7a9>] __blockdev_direct_IO+0x514/0xe2a
    [<b01cf449>] ext3_direct_IO+0x98/0x1e5
    [<b014e8df>] generic_file_direct_IO+0x63/0x133
    [<b01500e9>] generic_file_aio_read+0x16b/0x222
    [<b017f8b6>] aio_rw_vect_retry+0x5a/0x116
    [<b0180147>] aio_run_iocb+0x69/0x129
    [<b0180a78>] io_submit_one+0x194/0x2eb
    [<b0181331>] sys_io_submit+0x92/0xe7
    [<b0103f90>] syscall_call+0x7/0xb
    [<ffffffff>] 0xffffffff

    other info that might help us debug this:

    1 lock held by fio/9741:
    #0: (&inode->i_mutex){--..}, at: [<b038c6e5>] mutex_lock+0x1c/0x1f

    stack backtrace:
    [<b0104f54>] show_trace_log_lvl+0x1a/0x30
    [<b0105626>] show_trace+0x12/0x14
    [<b01056ad>] dump_stack+0x16/0x18
    [<b013c48d>] print_circular_bug_tail+0x68/0x71
    [<b013e259>] __lock_acquire+0xc4c/0xf9c
    [<b013e600>] lock_acquire+0x57/0x70
    [<b0137b92>] down_read+0x3a/0x4c
    [<b018cb34>] dio_get_page+0x54/0x161
    [<b018d7a9>] __blockdev_direct_IO+0x514/0xe2a
    [<b01cf449>] ext3_direct_IO+0x98/0x1e5
    [<b014e8df>] generic_file_direct_IO+0x63/0x133
    [<b01500e9>] generic_file_aio_read+0x16b/0x222
    [<b017f8b6>] aio_rw_vect_retry+0x5a/0x116
    [<b0180147>] aio_run_iocb+0x69/0x129
    [<b0180a78>] io_submit_one+0x194/0x2eb
    [<b0181331>] sys_io_submit+0x92/0xe7
    [<b0103f90>] syscall_call+0x7/0xb
    =======================

    The test run was fio, the job file used is:

    # fio job file snip below
    [global]
    bs=4k
    buffered=0
    ioengine=libaio
    iodepth=4
    thread

    [readers]
    numjobs=8
    size=128m
    rw=read
    # fio job file snip above

    Filesystem was ext3, default mkfs and mount options. Kernel was
    2.6.21-rc7 as of this morning, with some CFQ patches applied.

    --
    Jens Axboe

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