linux-kernel - Re: 2.6.33.1: USB camera hung_task_timeout

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Message-ID: <4BC81859.2080706@ribosome.natur.cuni.cz>
Date:	Fri, 16 Apr 2010 09:57:13 +0200
From:	Martin Mokrejs <mmokrejs@...osome.natur.cuni.cz>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Martin Mokrejs <mmokrejs@...osome.natur.cuni.cz>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	USB list <linux-usb@...r.kernel.org>,
	USB Storage list <usb-storage@...ts.one-eyed-alien.net>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.33.1: USB camera hung_task_timeout_secs >120 seconds

Alan Stern wrote:
> On Wed, 14 Apr 2010, Maciej Rutecki wrote:
>
>> (Add CCs)
>>
>> Can you check, that eg. 2.6.30 and latest -RC works OK?
>>
>> On wtorek, 13 kwietnia 2010 o 22:07:20 Martin Mokrejs wrote:
>>> Hi,
>>>     I am not certain whether the stacktrace I received is just intentional
>>> to attract developer eyes or whether this is actually a false alarm:
>>> mounting USB mass storage device media always takes a long while.
>>> This is a P4-M laptop with Kouwell 7004 FW/USB2.0 PCMCIA card.
>>> Comments?
>>> Thanks,
>>> martin
>
> If 2.6.34-rc doesn't work, please post a usbmon trace showing what
> happens when the device is plugged in.  Instructions are in
> Documentation/usb/usbmon.txt.

I am unable to reproduce this with any version 2.6.30.10., 2.6.31.12,
2.6.33.1, 2.6.34-rc4-git2. I turned off the camera many times, removed the
PCMCIA card while the USB media was recognized through kernel (not mounted),
no luck. I do use it say once a week and the crash I swa for the first time,
so I am not much optimistic on reproducibility. :(

Could it be related tot he fact that because the laptop has USB1.1 onboard
it loads uhci_hcd first. Eventually when I plugin the PCMCIA card it loads
ehci_hcd and the kernel complains it should have been loaded before?
Is there a way to tell this in /etc/modules.d/somefile ? I fear I have to
compile them into the kernel statically, on this particular setup.

Martin
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