linux-kernel - Re: USB device cannot be reconnected and khubd "blocked for more than 120 seconds"

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Message-ID: <50F12A65.90408@gmail.com>
Date:	Sat, 12 Jan 2013 17:18:29 +0800
From:	Lan Tianyu <lantianyu1986@...il.com>
To:	Alex Riesen <raa.lkml@...il.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-usb@...r.kernel.org
Subject: Re: USB device cannot be reconnected and khubd "blocked for more
 than 120 seconds"

On 2013年1月12日 15:48:59, Alex Riesen wrote:
> On Fri, Jan 11, 2013 at 10:04 PM, Alex Riesen <raa.lkml@...il.com> wrote:
>> Hi,
>>
>> the USB stick (an Cruzer Titanium 2GB) was not recognized at any of
>> the USB ports of this system (an System76 lemu4 laptop, XHCI device)
>> after it was removed. If I attempt to insert it again in any of the
>> ports (one of the two USB3, or the USB2) the led on the stick lights
>> up shortly and if off again. There is no media detection messages in
>> the dmesg output, only that from the first time:
>>
>>  usb 1-1.2: new high-speed USB device number 3 using ehci-pci
>>  usb 1-1.2: New USB device found, idVendor=0781, idProduct=5408
>>  usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
>>  usb 1-1.2: Product: U3 Titanium
>>  usb 1-1.2: Manufacturer: SanDisk Corporation
>>  usb 1-1.2: SerialNumber: 0000187A3A60F1E9
>>  scsi6 : usb-storage 1-1.2:1.0
>>  io scheduler deadline registered (default)
>>  usb 1-1.2: USB disconnect, device number 3
>>
>> The kernel is v3.8-rc3. I never had this problem in 3.7. I could almost
>> reproduce the problem later in a simplified setup (init=/bin/bash) on
>> USB3 ports by inserting and removing the stick quickly. Almost - because
>> the USB3 ports recovered after some time, while the USB2 port never
>> experienced the problem.
>
> One more detail: I usually use the "noop" elevator. That time it was
> the "deadline". And I just reproduced it easily with "deadline".
Can you provide the output of dmesg with CONFIG_USB_DEBUG? This will
be helpful.
> --
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--
Best regards
Tianyu Lan
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