# Segmentation fault (core dumped)

**URL:** <https://www.ruby-forum.com/t/segmentation-fault-core-dumped/238956>\
**Category:** GNU Radio\
**Created:** [February 5, 2014, 3:58pm UTC](https://www.ruby-forum.com/t/segmentation-fault-core-dumped/238956 "2014-02-05T15:58:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [February 5, 2014, 3:58pm UTC](https://www.ruby-forum.com/t/segmentation-fault-core-dumped/238956/1 "2014-02-05T15:58:06Z")

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Hello All,  
I have a Segmentation fault (core dumped), when i run  
digital\_bert\_rx.py and digital\_bert\_tx.py.  
./digital\_bert\_rx.py -f 2460M --rx-gain=30 --args=“addr=192.168.10.2”  
./digital\_bert\_tx.py -f 2460M --tx-gain=30 --args=“addr=192.168.10.3”  
–amplitude=0.2  
When I run for a sevral times digital\_bert\_tx.py with diffirent values  
of amplitude this error apear, like in this capture.  
Freq. Offset: -124987 Hz Timing Offset: 1493639.0 ppm Estimated SNR:  
nan dB BER: 0.166678Freq. Offset: -124938 Hz Timing Offset: 1492926.4  
ppm Estimated SNR: nan dB BER: 0.16616Freq. Offset: -124758 Hz  
Timing Offset: 1489323.6 ppm Estimated SNR: nan dB BER:  
0.165962Freq. Offset: -125000 Hz Timing Offset: 1496782.8 ppm  
Estimated SNR: -8.7 dB BER: 0.166483Freq. Offset: -124862 Hz Timing  
Offset: 1481416.7 ppm Estimated SNR: nan dB BER:  
0.166141Segmentation fault (core dumped)

I tried to debug the error and I found that the error was comming from a  
gnuradio kernel. The segmentation error is from this file :  
volk\_32fc\_32f\_dot\_prod\_32fc.h  
Program received signal SIGSEGV, Segmentation fault.[Switching to Thread  
0x7f6cdaffd700 (LWP 5423)]0x00007f6cf51d2e87 in  
volk\_32fc\_32f\_dot\_prod\_32fc\_a\_sse () from  
/usr/local/lib/libvolk.so.0.0.0

Can you help me please.

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<div class="post-metadata">

**Author:** ![raf\_raf](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/6bbea6/32.png) [@raf\_raf](https://www.ruby-forum.com/u/raf_raf)\
**Post date:** [February 5, 2014, 4:39pm UTC](https://www.ruby-forum.com/t/segmentation-fault-core-dumped/238956/2 "2014-02-05T16:39:35Z")

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On Wed, Feb 5, 2014 at 8:36 AM, raf raf [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> When I run for a sevral times digital\_bert\_tx.py with diffirent values of  
> Freq. Offset: -124862 Hz Timing Offset: 1481416.7 ppm Estimated SNR: nan  
> 0x00007f6cf51d2e87 in volk\_32fc\_32f\_dot\_prod\_32fc\_a\_sse () from  
> /usr/local/lib/libvolk.so.0.0.0
> 
> Can you help me please.

Hi Raf,

Can you provide more details? How did you install GNU Radio and what  
hardware are you running on? When you start the application you should  
see a message along the lines of “Using VOLK machine: xxxx”. What are  
the xxxx’s?

Nathan