upon boot (kernel-2.6.17-1.2647.fc6) on my thinkpad t60, I get a stacktrace.
Full dmesg output attached.

hub 4-0:1.0: 2 ports detected
input: SynPS/2 Synaptics TouchPad as /class/input/input1
PM: Adding info for serio:serio2

=============================================
[ INFO: possible recursive locking detected ]
2.6.17-1.2647.fc6 #1
---------------------------------------------
kseriod/139 is trying to acquire lock:
 (&ps2dev->cmd_mutex#2){--..}, at: [<c0614318>] mutex_lock+0x21/0x24

but task is already holding lock:
 (&ps2dev->cmd_mutex#2){--..}, at: [<c0614318>] mutex_lock+0x21/0x24

other info that might help us debug this:
4 locks held by kseriod/139:
 #0:  (serio_mutex){--..}, at: [<c0614318>] mutex_lock+0x21/0x24
 #1:  (&serio->drv_mutex){--..}, at: [<c0614318>] mutex_lock+0x21/0x24
 #2:  (psmouse_mutex){--..}, at: [<c0614318>] mutex_lock+0x21/0x24
 #3:  (&ps2dev->cmd_mutex#2){--..}, at: [<c0614318>] mutex_lock+0x21/0x24
stack backtrace:
 [<c04051ee>] show_trace_log_lvl+0x58/0x171
 [<c0405802>] show_trace+0xd/0x10
 [<c040591b>] dump_stack+0x19/0x1b
 [<c043b9e1>] __lock_acquire+0x778/0x99c
 [<c043c176>] lock_acquire+0x4b/0x6d
 [<c06141a9>] __mutex_lock_slowpath+0xbc/0x20a
 [<c0614318>] mutex_lock+0x21/0x24
 [<c05970ac>] ps2_command+0x7e/0x2cd
 [<c059c5a9>] psmouse_sliced_command+0x1c/0x5a
 [<c059faa7>] synaptics_pt_write+0x1e/0x43
 [<c0596f96>] ps2_sendbyte+0x3e/0xd6
 [<c0597126>] ps2_command+0xf8/0x2cd
 [<c059c1dc>] psmouse_probe+0x1d/0x68
 [<c059d150>] psmouse_connect+0xfa/0x221
 [<c05949c9>] serio_connect_driver+0x1e/0x2e
 [<c05949ef>] serio_driver_probe+0x16/0x18
 [<c05552d6>] driver_probe_device+0x45/0x92
 [<c055532b>] __device_attach+0x8/0xa
 [<c0554c6b>] bus_for_each_drv+0x3a/0x65
 [<c0555386>] device_attach+0x59/0x6e
 [<c05549a9>] bus_attach_device+0x16/0x2b
 [<c0553dfb>] device_add+0x1f8/0x2e0
 [<c059544b>] serio_thread+0xc6/0x283
 [<c0436575>] kthread+0xc3/0xf2
 [<c0402005>] kernel_thread_helper+0x5/0xb

DWARF2 unwinder stuck at kernel_thread_helper+0x5/0xb
Leftover inexact backtrace:
 [<c0405802>] show_trace+0xd/0x10
 [<c040591b>] dump_stack+0x19/0x1b
 [<c043b9e1>] __lock_acquire+0x778/0x99c
 [<c043c176>] lock_acquire+0x4b/0x6d
 [<c06141a9>] __mutex_lock_slowpath+0xbc/0x20a
 [<c0614318>] mutex_lock+0x21/0x24
 [<c05970ac>] ps2_command+0x7e/0x2cd
 [<c059c5a9>] psmouse_sliced_command+0x1c/0x5a
 [<c059faa7>] synaptics_pt_write+0x1e/0x43
 [<c0596f96>] ps2_sendbyte+0x3e/0xd6
 [<c0597126>] ps2_command+0xf8/0x2cd
 [<c059c1dc>] psmouse_probe+0x1d/0x68
 [<c059d150>] psmouse_connect+0xfa/0x221
 [<c05949c9>] serio_connect_driver+0x1e/0x2e
 [<c05949ef>] serio_driver_probe+0x16/0x18
 [<c05552d6>] driver_probe_device+0x45/0x92
 [<c055532b>] __device_attach+0x8/0xa
 [<c0554c6b>] bus_for_each_drv+0x3a/0x65
 [<c0555386>] device_attach+0x59/0x6e
 [<c05549a9>] bus_attach_device+0x16/0x2b
 [<c0553dfb>] device_add+0x1f8/0x2e0
 [<c059544b>] serio_thread+0xc6/0x283
 [<c0436575>] kthread+0xc3/0xf2
 [<c0402005>] kernel_thread_helper+0x5/0xb