Bug hunting

Christian Gagneraud chris at techworks.ie
Wed Aug 8 15:04:19 UTC 2012


On 08/08/12 00:23, Dimitri Stolnikov wrote:
> Hi Christian,
>

Hi Dimitri,

> could you please try the attached patch together with Peter's join
> patch? It handles async cancellation in a more graceful way.

Yes, it actually worked. thanks.

Chris

>
> The other problem (segfault on trow in ctor) still has to be addressed.
>
>
> Best regards,
> Dimitri
>
> On Tue, 07 Aug 2012 20:53:25 +0200, Christian Gagneraud
> <chris at techworks.ie> wrote:
>
>> On 07/08/12 15:49, Peter Stuge wrote:
>>> Christian Gagneraud wrote:
>>>> Please find attached the full log.
>>>
>>> Thanks!
>>>
>>>
>>>> I can provide u with a simple python program, but it will depends
>>>> on gnuradio, gr-osmosdr and you will need a compatible device
>>>> plugged in as well.
>>>
>>> No problem, but I think I find the problem.
>>>
>>>
>>>> libusb: 0.783771 debug [libusb_handle_events_timeout_completed]
>>>> doing our own event handling
>>>> libusb: 0.783793 debug [handle_events] poll() 3 fds with timeout in
>>>> 1000ms
>>>> libusb: 0.783811 debug [libusb_release_interface] interface 0
>>>> libusb: 0.785853 debug [handle_events] poll() returned 1
>>>
>>> The above lines show that the interface is released while event
>>> handling is still running. The destructor was called while the IO
>>> thread is running, and the destructor does cancel all IO, but it only
>>> waited 200 ms for the IO to complete, before it went on to close
>>> everything. Please try the attached patch for gr-osmosdr.
>>>
>>> This may or may not be the appropriate fix. This should perhaps be
>>> fixed inside rtl-sdr, or even libusb (we're already considering it)
>>> instead.
>>
>> It doesn't fix the problem alone. The script simply never exits.
>> I've just sent a patch for rtl-sdr that fix the issue.
>> I think it's still possible that a call to join() could block the app
>> forever, so maybe a longer timeout would be safer here. As well the
>> same apply for the osmosdr wrapper code.
>>
>> Chris
>>
>>>
>>>
>>> //Peter
>>>
>>


-- 
Christian Gagneraud,
Embedded systems engineer.
Techworks Marine
1 Harbour road
Dun Laoghaire
Co. Dublin
Ireland
Tel: + 353 (0) 1 236 5990
Web: http://www.techworks.ie/




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