Re: linux-next-20111108 lockdep whinge

[Yong Zhang]

On Wed, Nov 16, 2011 at 10:39:30PM -0500, Valdis.Kletnieks@xxxxxx wrote:
> Seen in dmesg during early boot.  Not sure if this is a lockdep issue, or a
> sched-rt issue, but MAINTAINERS says to ping the same people either way,
> so.... :)
> 
> Sorry, no known reproducer, have only seen this once in the last week.

Yeah, known issue.
Please refer below link:
http://marc.info/?l=linux-kernel&m=132082597024248

Thanks,
Yong

> 
> [    4.204350] usb 6-1: USB disconnect, device number 2
> [    6.660444] usb 6-1: new low-speed USB device number 3 using uhci_hcd
> [    6.683460] INFO: trying to register non-static key.
> [    6.684344] the code is fine but needs lockdep annotation.
> [    6.684417] turning off the locking correctness validator.
> [    6.684417] Pid: 74, comm: irq/20-uhci_hcd Not tainted 3.2.0-rc1-next-20111108 #38
> [    6.684417] Call Trace:
> [    6.684417]  [<ffffffff81069a23>] register_lock_class+0x102/0x2c6
> [    6.684417]  [<ffffffff8106993f>] ? register_lock_class+0x1e/0x2c6
> [    6.684417]  [<ffffffff8106993f>] ? register_lock_class+0x1e/0x2c6
> [    6.684417]  [<ffffffff8106b2d6>] ? validate_chain+0x5a/0x39d
> [    6.684417]  [<ffffffff8106b9fb>] __lock_acquire+0xbd/0x3e2
> [    6.684417]  [<ffffffff8102f7ab>] ? double_rq_lock+0x70/0x79
> [    6.684417]  [<ffffffff8106c256>] lock_acquire+0x103/0x153
> [    6.684417]  [<ffffffff8102f7ab>] ? double_rq_lock+0x70/0x79
> [    6.684417]  [<ffffffff815b1614>] _raw_spin_lock_nested+0x3a/0x49
> [    6.684417]  [<ffffffff8102f7ab>] ? double_rq_lock+0x70/0x79
> [    6.684417]  [<ffffffff815b1661>] ? _raw_spin_lock+0x3e/0x45
> [    6.684417]  [<ffffffff8102f78c>] ? double_rq_lock+0x51/0x79
> [    6.684417]  [<ffffffff8102f7ab>] double_rq_lock+0x70/0x79
> [    6.684417]  [<ffffffff8102f803>] double_lock_balance+0x4f/0x5d
> [    6.684417]  [<ffffffff8102f86b>] find_lock_lowest_rq+0x5a/0xfe
> [    6.684417]  [<ffffffff810353af>] push_rt_task.part.61+0xad/0x149
> [    6.684417]  [<ffffffff81035550>] post_schedule_rt+0x1b/0x23
> [    6.684417]  [<ffffffff8102d707>] post_schedule.part.21+0x2b/0x45
> [    6.684417]  [<ffffffff815af987>] __schedule+0x720/0x766
> [    6.684417]  [<ffffffff8109062f>] ? irq_thread_fn+0x37/0x37
> [    6.684417]  [<ffffffff815afb83>] schedule+0x55/0x57
> [    6.684417]  [<ffffffff810905ba>] irq_thread+0x18b/0x1c9
> [    6.684417]  [<ffffffff8109042f>] ? irq_finalize_oneshot+0xc9/0xc9
> [    6.684417]  [<ffffffff81058ca6>] kthread+0x7f/0x87
> [    6.684417]  [<ffffffff815b96f4>] kernel_thread_helper+0x4/0x10
> [    6.684417]  [<ffffffff815b22e1>] ? retint_restore_args+0xe/0xe
> [    6.684417]  [<ffffffff81058c27>] ? __init_kthread_worker+0x55/0x55
> [    6.684417]  [<ffffffff815b96f0>] ? gs_change+0xb/0xb
> [    6.896264] usb 6-1: New USB device found, idVendor=0e8f, idProduct=0020
> [    6.897516] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
> [    6.898848] usb 6-1: Product: PS2toUSB Adapter
> [    6.899718] usb 6-1: Manufacturer: GASIA
> [    6.917981] input: GASIA PS2toUSB Adapter as /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/input/input13
> 



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