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    SubjectRe: INFO: possible recursive locking detected ps2_command

    (cc linux-input)

    On Thu, 31 Jul 2008 11:41:25 +0200
    "Zdenek Kabelac" <zdenek.kabelac@gmail.com> wrote:

    > Hi
    >
    > During mouse unplugging from psaux connector from the laptops' docking
    > station I've got attached INFO trace.
    > (laptops still has synaptics device)
    >
    > Also for unknown reason to me psaux mouse & synaptic device do not
    > work somehow together - is it hw limitation
    > of /dev/input/mice interface?
    > (USB mouse and synaptics do work quite well together)
    >
    > [ INFO: possible recursive locking detected ]
    > 2.6.27-rc1 #48

    (it's 2.6.27-rc1)

    > ---------------------------------------------
    > kseriod/166 is trying to acquire lock:
    > (&ps2dev->cmd_mutex){--..}, at: [<ffffffff8126e9ae>] ps2_command+0x5e/0x460
    >
    > but task is already holding lock:
    > (&ps2dev->cmd_mutex){--..}, at: [<ffffffff8126e9ae>] ps2_command+0x5e/0x460
    >
    > other info that might help us debug this:
    > 4 locks held by kseriod/166:
    > #0: (serio_mutex){--..}, at: [<ffffffff8126cc1e>] serio_thread+0x3e/0x410
    > #1: (&serio->drv_mutex){--..}, at: [<ffffffff8126bf8b>]
    > serio_connect_driver+0x2b/0x50
    > #2: (psmouse_mutex){--..}, at: [<ffffffffa009aa00>]
    > psmouse_connect+0x30/0x2c0 [psmouse]
    > #3: (&ps2dev->cmd_mutex){--..}, at: [<ffffffff8126e9ae>]
    > ps2_command+0x5e/0x460
    >
    > stack backtrace:
    > Pid: 166, comm: kseriod Not tainted 2.6.27-rc1 #48
    >
    > Call Trace:
    > [<ffffffff81068bda>] __lock_acquire+0xcea/0x13b0
    > [<ffffffff81066401>] ? trace_hardirqs_off_caller+0x21/0xc0
    > [<ffffffff810664ad>] ? trace_hardirqs_off+0xd/0x10
    > [<ffffffff8126e9ae>] ? ps2_command+0x5e/0x460
    > [<ffffffff81069336>] lock_acquire+0x96/0xe0
    > [<ffffffff8126e9ae>] ? ps2_command+0x5e/0x460
    > [<ffffffff81313861>] mutex_lock_nested+0xc1/0x340
    > [<ffffffff8126e9ae>] ? ps2_command+0x5e/0x460
    > [<ffffffff810135a0>] ? native_sched_clock+0x90/0xb0
    > [<ffffffff8126e9ae>] ps2_command+0x5e/0x460
    > [<ffffffff81066401>] ? trace_hardirqs_off_caller+0x21/0xc0
    > [<ffffffff81065834>] ? get_lock_stats+0x34/0x70
    > [<ffffffffa009977d>] psmouse_sliced_command+0x2d/0x90 [psmouse]
    > [<ffffffff8126e838>] ? ps2_sendbyte+0x48/0x130
    > [<ffffffffa009b8f7>] synaptics_pt_write+0x27/0x60 [psmouse]
    > [<ffffffff81315acd>] ? _spin_unlock_irq+0x3d/0x80
    > [<ffffffff8126e84d>] ps2_sendbyte+0x5d/0x130
    > [<ffffffff81319840>] ? sub_preempt_count+0x80/0x120
    > [<ffffffff8126ea4d>] ps2_command+0xfd/0x460
    > [<ffffffff81319840>] ? sub_preempt_count+0x80/0x120
    > [<ffffffff81315acd>] ? _spin_unlock_irq+0x3d/0x80
    > [<ffffffffa0099917>] psmouse_probe+0x27/0xa0 [psmouse]
    > [<ffffffff8126c1e1>] ? serio_open+0x11/0x50
    > [<ffffffffa009ab48>] psmouse_connect+0x178/0x2c0 [psmouse]
    > [<ffffffff8126bf96>] serio_connect_driver+0x36/0x50
    > [<ffffffff8126bfcb>] serio_driver_probe+0x1b/0x20
    > [<ffffffff81221112>] driver_probe_device+0xa2/0x1e0
    > [<ffffffff812212e0>] ? __device_attach+0x0/0x10
    > [<ffffffff812212e9>] __device_attach+0x9/0x10
    > [<ffffffff8122050b>] bus_for_each_drv+0x6b/0xa0
    > [<ffffffff812213b8>] device_attach+0x88/0x90
    > [<ffffffff812202d5>] bus_attach_device+0x55/0x80
    > [<ffffffff8121ee99>] device_add+0x4f9/0x610
    > [<ffffffff81319840>] ? sub_preempt_count+0x80/0x120
    > [<ffffffff8126ce1c>] serio_thread+0x23c/0x410
    > [<ffffffff810571a0>] ? autoremove_wake_function+0x0/0x40
    > [<ffffffff8126cbe0>] ? serio_thread+0x0/0x410
    > [<ffffffff81056de9>] kthread+0x49/0x90
    > [<ffffffff8100d669>] child_rip+0xa/0x11
    > [<ffffffff8103b757>] ? finish_task_switch+0x57/0x110
    > [<ffffffff81315acd>] ? _spin_unlock_irq+0x3d/0x80
    > [<ffffffff8100cc73>] ? restore_args+0x0/0x30
    > [<ffffffff810664ad>] ? trace_hardirqs_off+0xd/0x10
    > [<ffffffff81056da0>] ? kthread+0x0/0x90
    > [<ffffffff8100d65f>] ? child_rip+0x0/0x11



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