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    Subject2.6.24-rc8: possible circular locking dependency detected

    just FYI, upgrading to -rc8 gave the following messages in kern.log in
    the morning hours, when the backups were run:

    [ INFO: possible circular locking dependency detected ]
    2.6.24-rc8 #2
    rsync/23295 is trying to acquire lock:
    (iprune_mutex){--..}, at: [<c017a552>] shrink_icache_memory+0x72/0x220

    but task is already holding lock:
    (&(&ip->i_iolock)->mr_lock){----}, at: [<c0275056>] xfs_ilock+0x96/0xb0

    which lock already depends on the new lock.

    the existing dependency chain (in reverse order) is:

    -> #1 (&(&ip->i_iolock)->mr_lock){----}:
    [<c0138c01>] __lock_acquire+0xbe1/0x10b0
    [<c0275056>] xfs_ilock+0x96/0xb0
    [<c0137b4f>] trace_hardirqs_on+0x9f/0x140
    [<c013912f>] lock_acquire+0x5f/0x80
    [<c0275056>] xfs_ilock+0x96/0xb0
    [<c012f4b1>] down_write_nested+0x41/0x60
    [<c0275056>] xfs_ilock+0x96/0xb0
    [<c0275056>] xfs_ilock+0x96/0xb0
    [<c02751ea>] xfs_ireclaim+0x1a/0x60
    [<c0294e73>] xfs_finish_reclaim+0x53/0x1a0
    [<c02a40ce>] xfs_fs_clear_inode+0x5e/0x90
    [<c017a102>] clear_inode+0x82/0x160
    [<c017a55c>] shrink_icache_memory+0x7c/0x220
    [<c017a43a>] dispose_list+0x1a/0xc0
    [<c017a6c2>] shrink_icache_memory+0x1e2/0x220
    [<c014f6d1>] shrink_slab+0x101/0x160
    [<c014fa4a>] kswapd+0x2aa/0x410
    [<c012c1f0>] autoremove_wake_function+0x0/0x40
    [<c014f7a0>] kswapd+0x0/0x410
    [<c012bf42>] kthread+0x42/0x70

    Full dmesg and .config:

    BOFH excuse #18:

    excess surge protection

     \ /
      Last update: 2008-01-18 22:47    [W:0.043 / U:9.700 seconds]
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