linux-kernel - INFO: possible recursive locking detected ps2

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Date:	Thu, 31 Jul 2008 11:41:25 +0200
From:	"Zdenek Kabelac" <zdenek.kabelac@...il.com>
To:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: INFO: possible recursive locking detected ps2_command

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
---------------------------------------------
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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