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    SubjectRe: INFO: task mount:11202 blocked for more than 120 seconds
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    On Thursday 13 March 2008 14:45:39 Christian Kujau wrote:
    > and so does -git8 and -git9...sigh :(

    hmm, I can boot any of these -rcX-gitY kernels (but not without some stuck
    tasks after about a hour or so...)

    but back: I tried lockdep and ran into this: (debug blocker)

    pktcdvd: writer pktcdvd0 mapped to sr0

    =============================================
    [ INFO: possible recursive locking detected ]
    2.6.25-rc5-git3 #2
    ---------------------------------------------
    scsi_id/8262 is trying to acquire lock:
    (&bdev->bd_mutex){--..}, at: [<ffffffff802a8e51>] do_open+0x7b/0x2c0

    but task is already holding lock:
    (&bdev->bd_mutex){--..}, at: [<ffffffff802a8e51>] do_open+0x7b/0x2c0

    other info that might help us debug this:
    2 locks held by scsi_id/8262:
    #0: (&bdev->bd_mutex){--..}, at: [<ffffffff802a8e51>] do_open+0x7b/0x2c0
    #1: (&ctl_mutex#2){--..}, at: [<ffffffff88231af2>] pkt_open+0x26/0x516
    [pktcdvd]

    stack backtrace:
    Pid: 8262, comm: scsi_id Not tainted 2.6.25-rc5-git3 #2

    Call Trace:
    [<ffffffff8024ffe4>] __lock_acquire+0x8c9/0xc72
    [<ffffffff804bb23e>] ? __mutex_unlock_slowpath+0xf9/0x105
    [<ffffffff8025079f>] lock_acquire+0x5e/0x77
    [<ffffffff802a8e51>] ? do_open+0x7b/0x2c0
    [<ffffffff804bb336>] mutex_lock_nested+0xe1/0x270
    [<ffffffff802a8e51>] ? do_open+0x7b/0x2c0
    [<ffffffff802a8e51>] do_open+0x7b/0x2c0
    [<ffffffff802a9116>] __blkdev_get+0x80/0x92
    [<ffffffff802a9133>] blkdev_get+0xb/0xd
    [<ffffffff88231b6b>] :pktcdvd:pkt_open+0x9f/0x516
    [<ffffffff802a8e84>] do_open+0xae/0x2c0
    [<ffffffff802a92a4>] ? blkdev_open+0x0/0x6a
    [<ffffffff804bcbab>] ? _spin_unlock+0x26/0x2a
    [<ffffffff802a92a4>] ? blkdev_open+0x0/0x6a
    [<ffffffff802a92db>] blkdev_open+0x37/0x6a
    [<ffffffff80282571>] __dentry_open+0xe6/0x1c0
    [<ffffffff802826e4>] nameidata_to_filp+0x2e/0x40
    [<ffffffff8028272f>] do_filp_open+0x39/0x4b
    [<ffffffff804bcbab>] ? _spin_unlock+0x26/0x2a
    [<ffffffff8028246f>] ? get_unused_fd_flags+0x10d/0x11c
    [<ffffffff80282792>] do_sys_open+0x51/0xd9
    [<ffffffff80282843>] sys_open+0x1b/0x1d
    [<ffffffff8020b22b>] system_call_after_swapgs+0x7b/0x80

    soooo.....?

    scsi_id/8262 is trying to acquire lock:
    (&bdev->bd_mutex){--..}, at: [<ffffffff802a8e51>] do_open+0x7b/0x2c0

    but task is already holding lock:
    (&bdev->bd_mutex){--..}, at: [<ffffffff802a8e51>] do_open+0x7b/0x2c0

    sounds a bit strange? Is this a SMP related problem after all?
    (*disabled pktcddvd for now... to see if still locks)

    Regards,
    Chr...


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