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Date: Fri, 08 Apr 2011 11:07:08 +0200
From: Oncaphillis <oncaphillis@snafu.de>
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To: Alan Stern <stern@rowland.harvard.edu>
CC: Xiaofan Chen <xiaofanc@gmail.com>, libusb-devel@lists.sourceforge.net,
        Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: [Libusb-devel] Kernel bug message and missing data on	libusb_interrupt_transfer
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On 04/06/2011 12:37 PM, Oncaphillis wrote:
> On 04/05/2011 04:42 PM, Alan Stern wrote:
>> On Tue, 5 Apr 2011, Oncaphillis wrote:
>>
>>> On 04/05/2011 04:13 PM, Alan Stern wrote:
>>>> On Tue, 5 Apr 2011, Oncaphillis wrote:
>>>>
>>>>> Now I get
>>>>>
>>>>> <snip>
>>>>> ------------[ cut here ]------------
>>>>> kernel BUG at mm/slub.c:2808!
>>>>> invalid opcode: 0000 [#2] SMP
>>>> Can you duplicate this using either a 2.6.37 or 2.6.38 kernel?
>>>>
>>>> Alan Stern
>>>>
>>> The highest kernel version we've tried (as far as i remember) was the
>>> 2.6.36. Have there been issues which might have been solved betwen 36
>>> and 3(7|8) ?
>> I don't know.  But the core kernel developers always want to hear about
>> problems reported against the most recent version possible.  If you
>> could test 2.6.39-rc1 (or -rc2, which should be released in a day or
>> so), that would be even better.
> Ok -- kernel 2.6.38.2 together with libusb-1.0.8 seems to behave well.
> This was only a minimal overnight test. Not the full functionality we
> are trying to implement. But it looks promising.
>
>    Thank you
>
>    O.
>
Just a short update,

  It doesn't seem to have anything to do with the libsub-1.0.x) version but
with the --(enable|disable)-timerfd option of libusb configure. If 
libusb was
configured with --disable-timerfd, which was the case for our 1.0.6 libusb
I get the kernel bug message in in slub.c module and eventually a
kernel freeze. This holds true for libusb-1.0.8 and kernel 2.6.38.2

O.

>>> I'll give it a try.
>> Thanks.
>>
>> Alan Stern
>>
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