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Re: [Discuss-gnuradio] UHD Source -and- Sink In Same GRC Fl owgraph ?

From: mleech
Subject: Re: [Discuss-gnuradio] UHD Source -and- Sink In Same GRC Fl owgraph ?
Date: Tue, 21 Feb 2012 15:02:16 -0500
User-agent: Roundcube Webmail/0.5.1

I'm willing to bet that your segfault comes from our friend OpenGL:

Try this before you start your application:



Also try updating to latest master for Gnu Radio and UHD.  If you're on Ubuntu or Fedora, you can use:


To do the download/build/install/post-install   dance




On Tue, 21 Feb 2012 19:55:45 +0000, Iain Young, G7III wrote:

Hi Folks,

I'm having some fun and games with gnuradio, a USRP1, and trying to
transmit and receive at the same time, using gnuradio-companion.

A Simple [UHD SOURCE] ----> [UHD SINK] works perfectly, but when I
start to try to do other things, I get a Segmentation Fault from

Even something as simple as this graph SEGVs on me (Yes, I know it's
useless, but I cut everything down to as simple as I could to confirm
the problem wasn't in my flowgraph, and those blocks were already in
my wonderfully crafted flowgraph!):


It does not seem to matter what antennas or sub devices I
select (I have twin WBX boards, so am able to switch which
antennas do what..)

My gnuradio installation is from git, just a few weeks ago, 
gnuradio-config-info -v shows v3.5.1-43-g309ca769

UHD is from the same date (3rd Feb looking at my datestamps),
and uhd_find_devices reports:

linux; GNU C++ version 4.6.1; Boost_104601; UHD_003.004.000-5b06adb

for it's version, and does find my URSP as expected with it's
dual WBX's. USRP Firmware is from 29-11-2011 (latest I found), Base
system is Ubuntu 12.04.

Anyone have any pointers ? Is this a known issue ? Would upgrading
to the very latest HEAD help me ? Or is there something I need to
do in code prior to running both a UHD SOURCE and SINK in the same
flowgraph under grc ?

Best Regards


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