2.6.18-git21, possible recursive locking in kseriod ends up in DWARF2 unwinder stuck

["Alessandro Suardi" <alessandro.suardi@gmail.com>]

Non-fatal (box is still alive and apparently well) on boot,
FC5-uptodate on a Dell Latitude C640. From the dmesg ring:

[    8.680000] =============================================
[    8.680000] [ INFO: possible recursive locking detected ]
[    8.680000] 2.6.18-git21 #1
[    8.680000] ---------------------------------------------
[    8.680000] kseriod/163 is trying to acquire lock:
[    8.680000]  (&ps2dev->cmd_mutex/1){--..}, at: [<c03198c3>]
ps2_command+0x89/0x358
[    8.680000]
[    8.680000] but task is already holding lock:
[    8.680000]  (&ps2dev->cmd_mutex/1){--..}, at: [<c03198c3>]
ps2_command+0x89/0x358
[    8.680000]
[    8.680000] other info that might help us debug this:
[    8.680000] 4 locks held by kseriod/163:
[    8.680000]  #0:  (serio_mutex){--..}, at: [<c0317a5f>]
serio_thread+0x11/0x2ca
[    8.680000]  #1:  (&serio->drv_mutex){--..}, at: [<c0316f2c>]
serio_connect_driver+0x17/0x32
[    8.680000]  #2:  (psmouse_mutex){--..}, at: [<c0320a90>]
psmouse_connect+0x11/0x24a
[    8.680000]  #3:  (&ps2dev->cmd_mutex/1){--..}, at: [<c03198c3>]
ps2_command+0x89/0x358
[    8.680000]
[    8.680000] stack backtrace:
[    8.680000]  [<c010339c>] show_trace_log_lvl+0x24/0x39
[    8.680000]  [<c0103b54>] dump_stack+0x24/0x28
[    8.680000]  [<c0129c8f>] __lock_acquire+0x128/0xa1c
[    8.680000]  [<c012a897>] lock_acquire+0x6a/0x84
[    8.680000]  [<c03d14f5>] mutex_lock_nested+0xd8/0x25b
[    8.680000]  [<c03198c3>] ps2_command+0x89/0x358
[    8.680000]  [<c031fed9>] psmouse_sliced_command+0x2c/0x74
[    8.680000]  [<c0323be0>] synaptics_pt_write+0x2a/0x5a
[    8.680000]  [<c031978e>] ps2_sendbyte+0x51/0xfd
[    8.680000]  [<c031994f>] ps2_command+0x115/0x358
[    8.680000]  [<c031fa59>] psmouse_probe+0x24/0x7d
[    8.680000]  [<c0320b8d>] psmouse_connect+0x10e/0x24a
[    8.680000]  [<c0316f36>] serio_connect_driver+0x21/0x32
[    8.680000]  [<c02e0615>] really_probe+0x3c/0xc3
[    8.680000]  [<c02dfaea>] bus_for_each_drv+0x52/0x84
[    8.680000]  [<c02e07a9>] device_attach+0x5e/0x72
[    8.680000]  [<c02dfa6c>] bus_attach_device+0x24/0x50
[    8.680000]  [<c02ded5c>] device_add+0x37d/0x4bf
[    8.680000]  [<c0317b29>] serio_thread+0xdb/0x2ca
[    8.680000]  [<c0123d19>] kthread+0xc5/0xf4
[    8.680000]  [<c0102edb>] kernel_thread_helper+0x7/0x10
[    8.680000] DWARF2 unwinder stuck at kernel_thread_helper+0x7/0x10
[    8.680000]
[    8.680000] Leftover inexact backtrace:
[    8.680000]
[    8.680000]  =======================


--alessandro

"Well a man has two reasons for things that he does
 the first one is pride and the second one is love
 all understandings must come by this way"

    (Husker Du, 'She Floated Away')
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