Re: [Discuss-gnuradio] Segmentation fault in volk_32f_s32f_multiply_32f_a_sse

[Alexandru Csete]

On Sat, Apr 7, 2012 at 5:35 PM, Tom Rondeau <address@hidden> wrote:
> On Sat, Apr 7, 2012 at 10:19 AM, Alexandru Csete <address@hidden> wrote:
>> On Sat, Apr 7, 2012 at 4:13 PM, Tom Rondeau <address@hidden> wrote:
>>> On Sat, Apr 7, 2012 at 9:48 AM, Alexandru Csete <address@hidden> wrote:
>>>> Greetings,
>>>>
>>>> I'm getting segmentation faults in a C++ application when I restart
>>>> the flow graph, i.e by doing:
>>>>
>>>> tb->start()
>>>>  ...
>>>> tb->stop()
>>>> tb->wait()
>>>> ...
>>>> tb->start()
>>>> (crashes)
>>>>
>>>> Running the application through a debugger suggests it is
>>>> volk_32f_s32f_multiply_32f_a_sse which is used by a gr_multiply_ff()
>>>> block. I end up with the attached assembly dump with a marker
>>>> highlighting line 19.
>>>>
>>>> I have attached a simple python flow graph, which also crashes for me.
>>>> Note that the python code was originally generated by GRC and it used
>>>> gr.multiply_const_vff which didn't crash. I manually changed it to
>>>> gr.multiply_const_ff to provoke the crash.
>>>>
>>>> This is happening on Ubuntu 11.04 64 bit and intel i7 processor. I'm
>>>> also seeing the message "Using Volk machine: sse4_2_64" when I start
>>>> the graph. GNU Radio is built using cmake.
>>>>
>>>> Alex
>>>
>>> What version of GNU Radio are you using? This sounds like a bug that
>>> was fixed a little while ago and is not a release version yet (will be
>>> in 3.5.3).
>>>
>>
>> Hi Tom,
>>
>> I pulled from origin/master earlier today. Git describe says
>> v3.5.2.1-103-gfaf1d33
>> Is there another branch I can try?
>>
>> Alex
>
>
> Alex,
>
> Can you try applying the attached patch? It should work, but I've only
> tested it on one of my machines. This makes sure all buffers are
> aligned and all blocks know if after a start and restart.
>
> Thanks,
> Tom

The patch fixed my problem. Thanks for the q

Alex