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Subject[BUG] parport issue on 2.6.29
This warning happens whenever a specific parallel port control app is run 
without a device attached to it. After the first timeout, the app hangs,
and needs SIGKILL to exit.

WARNING: at kernel/sysctl.c:2021 unregister_sysctl_table+0xa3/0x110()
Hardware name:
Modules linked in:
Pid: 12161, comm: x-killer.exe Not tainted 2.6.29.4 #14
Call Trace:
[<ffffffff8024c910>] warn_slowpath+0xd0/0x130
[<ffffffff80269859>] ? sched_clock_cpu+0xb9/0x190
[<ffffffff802484b4>] ? try_to_wake_up+0x174/0x330
[<ffffffff80268554>] ? up+0x34/0x50
[<ffffffff8024d1cd>] ? release_console_sem+0x1bd/0x210
[<ffffffff80aaa4d4>] ? printk+0x67/0x69
[<ffffffff80254ec3>] unregister_sysctl_table+0xa3/0x110
[<ffffffff806b3128>] parport_device_proc_unregister+0x28/0x40
[<ffffffff806b05f5>] parport_unregister_device+0x15/0x180
[<ffffffff806a0acc>] pp_release+0xbc/0x1f0
[<ffffffff802d3883>] __fput+0xc3/0x1e0
[<ffffffff802d39bd>] fput+0x1d/0x30
[<ffffffff802d0220>] filp_close+0x50/0x80
[<ffffffff8024ec74>] put_files_struct+0x84/0xe0
[<ffffffff8024ed1e>] exit_files+0x4e/0x60
[<ffffffff80250696>] do_exit+0x196/0x930
[<ffffffff80250e6e>] do_group_exit+0x3e/0xb0
[<ffffffff8025bda4>] get_signal_to_deliver+0x2a4/0x420
[<ffffffff8020b7aa>] do_notify_resume+0xba/0x900
[<ffffffff8023c16e>] ? __wake_up+0x4e/0x70
[<ffffffff8026c4a9>] ? getnstimeofday+0x59/0xe0
[<ffffffff80267a09>] ? ktime_get_ts+0x59/0x60
[<ffffffff80274314>] ? compat_sys_futex+0xb4/0x140
[<ffffffff8020c8b5>] int_signal+0x12/0x17
--[ end trace ff1bd583c825c0c5 ]---
pdev0: unregistered pardevice


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