Re: [Discuss-gnuradio] segfault and gr-fcd

[Alexandru Csete]

Glad to hear yo have better luck with libusb 1.0.8.
Concerning the errors you see, I don't know how severe they are. There
are two layers between gr-fcd and libusb and I have knowledge only
with the higher levels.

Alex

On Sat, Apr 7, 2012 at 5:59 PM, Volker Schroer <address@hidden> wrote:
> Downgrading to libusb-1.0.8 solved the problem. I only see some messages
> like
>
> libusb:error [libusb_cancel_transfer] cancel transfer failed error -5
> libusb:error [libusb_cancel_transfer] cancel transfer failed error -5
> libusb:error [libusb_cancel_transfer] cancel transfer failed error -5
> aUaUaUaUaUaUaUaUlibusb:error [libusb_cancel_transfer] cancel transfer failed
> error -5
> aUaUaUaUlibusb:error [libusb_cancel_transfer] cancel transfer failed error
> -5
> libusb:error [libusb_cancel_transfer] cancel transfer failed error -5
> libusb:error [libusb_cancel_transfer] cancel transfer failed error -5
> libusb:error [libusb_cancel_transfer] cancel transfer failed error -5
>
> But no segfault anymore.
>
> Am 07.04.2012 17:38, schrieb Volker Schroer:
>>
>> Hi Alex,
>> thank you for the quick response.
>>
>>> Hi Volker,
>>>
>>> Although using a slider to tune hardware pll is a bad idea, I don't
>>> think the crash you see is because of that. It sounds more like an
>>> issue some people have seen on debian with libusb 1.0.9-pre-something
>>>
>>> Which version of libusb do you have? Can you run the included examples
>>> and qthid without crash?
>>
>> I'm using libusb-1.0.9_rc3. I get a similar problem using qthid. qthid
>> crashes before showing up the gui.
>> I think, libusb has a problem multiple open and closing the device. So I
>> just changed the code of qthid to open the device only at the beginning and
>> keep it open. Then qthid works.
>>>
>>> PS: The slider in your example isn't doing much as it has only one step
>>> ;-)
>>
>> I know, but it was the easiest way to show the problem.
>>
>> Perhaps I should downgrade libusb.
>>
>> Volker
>>
>>
>>
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>