[Discuss-gnuradio] Segmentation fault

​hello all

i followed the http://gnuradio.org/doc/doxygen/classgr_1_1digital_1_1diff__decoder__bb.html

and write the same grc on e310, when i run it ,i got no GUI show , then i run the python file generated by this grc in command window,

./debug_qpsk.py

i got a output message

Using Volk machine: neon_hardfp

Segmentation fault

then i use pdb to debug this python file

i set a breakpoint before just like

,then run step by step ,and run into the function called by tb.start,

i got 

I hope someone can know what does it mean，what the matter that cause the 

Segmentation fault

thank you 

--Ekko

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