linux-kernel - Re: INFO: task khubd:271 blocked for more than 120 seconds.

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Date:	Wed, 16 Jun 2010 15:22:45 +0300
From:	roma1390 <roma1390@...il.com>
To:	Oliver Neukum <oneukum@...e.de>
CC:	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org
Subject: Re: INFO: task khubd:271 blocked for more than 120 seconds.

Oliver Neukum wrote:
>> Jun 12 17:01:09  kernel: [257610.508638] Uhhuh. NMI received for unknown reason b1.
>> Jun 12 17:01:09  kernel: [257610.508668] You have some hardware problem, likely on the PCI bus.
>> Jun 12 17:01:09  kernel: [257610.508696] Dazed and confused, but trying to continue
> 
> This should definitely not happen. And it now I wonder how functional your
> controller is at that point.

all worked fine until 'Jun 16 00:36:55'. Usb device was used over libusb periodicaly (1-5 minutes) all that time.

>> Jun 12 23:30:30  kernel: [287011.166413] usb 6-1: USB disconnect, address 2
> 
> Still after all this time, this is probably genuine.

I think this was normal usb device plug/unplug.

>> Jun 12 23:30:51  kernel: [287035.906789] usb 6-1: new full speed USB device using uhci_hcd and address 3
>> Jun 12 23:30:51  kernel: [287036.065433] usb 6-1: configuration #1 chosen from 1 choice
>> Jun 12 23:30:51  kernel: [287036.093490] input: HP Virtual Keyboard as /class/input/input7
>> Jun 12 23:30:51  kernel: [287036.168130] input,hidraw0: USB HID v1.01 Keyboard [HP Virtual Keyboard] on usb-0000:01:04.4-1
>> Jun 12 23:30:51  kernel: [287036.175959] input: HP Virtual Keyboard as /class/input/input8
>> Jun 12 23:30:51  kernel: [287036.216150] input,hidraw1: USB HID v1.01 Mouse [HP Virtual Keyboard] on usb-0000:01:04.4-1
>> Jun 12 23:30:51  kernel: [287036.220005] usb 6-1: New USB device found, idVendor=03f0, idProduct=1027
>> Jun 12 23:30:51  kernel: [287036.220005] usb 6-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
>> Jun 12 23:30:51  kernel: [287036.220005] usb 6-1: Product: Virtual Keyboard
>> Jun 12 23:30:51  kernel: [287036.220005] usb 6-1: Manufacturer: HP
>> Jun 13 06:25:02  kernel: imklog 3.18.6, log source = /proc/kmsg started.
>> Jun 13 06:25:03  kernel: imklog 3.18.6, log source = /proc/kmsg started.
>> Jun 14 06:25:01  kernel: imklog 3.18.6, log source = /proc/kmsg started.
>> Jun 15 06:25:01  kernel: imklog 3.18.6, log source = /proc/kmsg started.
>> Jun 16 00:36:55  kernel: [600606.885265] usb 6-1: USB disconnect, address 3
> 
> And this. Looks like a bad cable.

I think this is of usb device failure, but the bigest problem is that blocked hang. There isn't any cable except wiretraces on motherboard :D.
That device is like: http://www.aradasystems.com/Upload/ProductImages/128835373116845000image_usb_dongle.jpg and connected dirrectly to
the usb port, which is inside server case.

>> Jun 16 00:39:02  kernel: [600738.152638] INFO: task khubd:271 blocked for more than 120 seconds.
>> Jun 16 00:39:02  kernel: [600738.152682] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Jun 16 00:39:02  kernel: [600738.155993] khubd         D ffff810916ca1400     0   271      2
>> Jun 16 00:39:02  kernel: [600738.156038]  ffff810919523d50 0000000000000046 363030365b3e363c 36323538382e3630
> 
> Alan, didn't you recently fix an issue like this?
> 
> 	Regards
> 		Oliver

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