Re: [Discuss-gnuradio] Segmentation fault

Hi Ekko,

SIGILL != SIGSEGV, so what we're seeing here is not a segmentation fault. Hoping that Philip Balister has more insights.
What happens if you type "continue" at this point?

Best regards,
Marcus

On 25.11.2015 13:22, chai E wrote:

thank you very much for the tutorials

i use the gdb to debug my program 

and i got the backtrace

​

this is the part of my debug screenshot,i am a newer with my device usrp e310, 

i want to know how can i find what is the problem in my program or machine with these output message.

i have see the tutorial 

http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsGDB as marcus said 

i can see the #0 ,and use command list to see the source code ,but i do not konw what's this mean in my machine.

hope for yours pointings  and  teach.

thank you very much :)

--From a learner

​
​

2015-11-24 23:55 GMT+08:00 Tom Rondeau <tom@trondeau.com>:

On Tue, Nov 24, 2015 at 10:47 AM, West, Nathan <natw@ostatemail.okstate.edu> wrote:

We're short on information to actually determine what's wrong here. It looks like you're still using pdb, but I see different output/problem areas from  your screenshots. The first one looks like it crashed in tb.start, and the second one looks like it crashed just creating the channel model block. Can you confirm what line is actually crashing, and report your gnuradio + volk version?

If it's at runtime and you're using an older ettus image (rel3? rel2? I haven't kept up with versions and dates) you might be getting bit by this https://github.com/gnuradio/volk/issues/25 which can be fixed by either adding some lines to volk_config or by upgrading to that latest release.

On Tue, Nov 24, 2015 at 9:40 AM, chai E <chai18740449846@gmail.com> wrote:

hi marcus

i use the gdb as you said,the i debug the python file again

run the fie step by step 

i found that the there is some problem with 'channel model',just like

​ you can see that 

self.channels_channel_model_0 = channels.channel_model( 

function is init the channel model block

and the noise_voltage =0.0001 ,frequency_offset=0 and so on is the parameter of 'channel model'

after the parameter is inited,the program should call the 

 Subroutine to pass this parameters,but you can see that the program aborted,

then i use command p to view the value of self.channels_channel_model_0,but i got the output

there is no attribute of this ,in other words 

i think that there is some problem with the channel model in the pre-installed gnuradio.

hope you can confirm this problem

--Ekko

Marcus is usually quite to point out this link. Surprised he hasn't so far :p

These are some techniques and ideas for debugging applications to better engage with us on the real problems:

http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsDebugging

Tom

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