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Re: [Discuss-gnuradio] Segfault

From: Nick Foster
Subject: Re: [Discuss-gnuradio] Segfault
Date: Wed, 14 Mar 2012 10:58:31 -0700

On Wed, Mar 14, 2012 at 10:55 AM, Stefan Ott <address@hidden> wrote:
On Wed, Mar 14, 2012 at 18:48, Nick Foster <address@hidden> wrote:
> On Wed, Mar 14, 2012 at 10:42 AM, Stefan Ott <address@hidden> wrote:
>> Hey list
>> I managed to build gnuradio 3.5.1 and (almost) got it working on the
>> USRP E110. However, when I try to run uhd_rx_cfile.py (with
>> --samp-rate 10e6 -f 97.7e6) it segfaults. You will find the log below.
> So there is essentially no chance the E110 can record to Flash at 10Msps. It
> probably won't sustain flash writes at 500ksps. Try a lower sample rate, or
> a small number of samples written to a tmpfs instead.
> That said, it shouldn't segfault, even at high sample rates. Does a lower
> rate work OK?

I am actually writing to RAM so that shouldn't be the problem. And
yes, it also segfaults at lower sample rates (I tried multiple values
down to 1) and with a small number of samples (also tried just 1

It would seem that the very idea of reading from the device causes the segfault.

What version of UHD are you using? What kernel driver? Have you updated anything else on the E110 image besides Gnuradio? Did it work for you before updating Gnuradio?


Stefan Ott
Communication and Distributed Systems
Institute of Computer Science and Applied Mathematics
University of Bern

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