Re: [Discuss-gnuradio] Custom C++ blocks on E310

Hi Ben,

 

Here is some of the backtrace from the error. At the top level, the error starts in the msg_connect function and it looks like it gets tripped up reading something from memory when checking for a valid message port.

 

#0  0xb635c67c in fetch_add (order=boost::memory_order_relaxed, v=1,

    storage=@0x6: <error reading variable>)

    at /home /prefix /sysroots/armv7ahf-vfp-neon-oe-linux-gnueabi/usr/include/boost/atomic/detail/ops_gcc_atomic.hpp:100

#1  fetch_add (order=boost::memory_order_relaxed, v=1, this=0x6)

    at /home /prefix /sysroots/armv7ahf-vfp-neon-oe-linux-gnueabi/usr/include/boost/atomic/detail/atomic_template.hpp:115

#2  pmt::intrusive_ptr_add_ref (p=0x2)

    at /home /prefix /src/gnuradio/gnuradio-runtime/lib/pmt/pmt.cc:69

#3  0xb63e56e4 in intrusive_ptr (rhs=..., this=0xbeffec7c)

    at /home /prefix /sysroots/armv7ahf-vfp-neon-oe-linux-gnueabi/usr/include/boost/smart_ptr/intrusive_ptr.hpp:92

#4  gr::flowgraph::check_valid_port (this=this@entry=0x10c578, e=...)

    at /home /prefix /src/gnuradio/gnuradio-runtime/lib/flowgraph.cc:162

#5  0xb63e95d0 in gr::flowgraph::connect (this=this@entry=0x10c578, src=...,

    dst=...)

    at /home /prefix /src/gnuradio/gnuradio-runtime/lib/flowgraph.cc:503

#6  0xb63f4c84 in gr::hier_block2_detail::msg_connect (

    this=this@entry=0x10c528, src=..., srcport=..., dst=..., dstport=...)

    at /home /prefix /src/gnuradio/gnuradio-runtime/lib/hier_block2_detail.cc:198

#7  0xb63f1b14 in gr::hier_block2::msg_connect (this=this@entry=0x0, src=...,

    srcport=..., dst=..., dstport=...)

    at /home /prefix /src/gnuradio/gnuradio-runtime/lib/hier_block2.cc:104

#8  0xb5cd6958 in _wrap_top_block_sptr_primitive_msg_connect__SWIG_1 (

    args=<optimized out>)

    at /home /prefix_new/src/gnuradio/build-arm/gnuradio-runtime/swig/runtime_swigPYTHON_wrap.cxx:47551

 

Thanks,

Jessica

 

From: Ben Hilburn [mailto:bhilburn@gnuradio.org]
Sent: Friday, May 12, 2017 1:35 PM
To: Jessica Iwamoto <jessica.iwamoto@aero.org>
Cc: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Custom C++ blocks on E310

 

Hey Jessica -

 

The SIGBUS you are receiving indicates that there is likely some funniness happening with memory addressing / access somewhere. Especially since your test flowgraph is so simple, using GDB to get a backtrace might point you to the offending code pretty quickly. For more details on how to do this, check out this page on our Wiki: https://wiki.gnuradio.org/index.php/TutorialsDebugging#Expert_debugging_tools

 

Have you tried this already? If so, can you share the backtrace?

 

Cheers,

Ben

 

 

 

On Thu, May 11, 2017 at 6:15 PM, Jessica Iwamoto <jessica.iwamoto@aero.org> wrote:

Hi again,

 

Attached is the code that I'm using if anyone would like to try to replicate my issue. The test_msg_py.py file contains the custom python block code for a simple message sink. The test_msg_impl.cc, test_msg_impl.h, and test_msg.h files contain the custom C++ code for a message sink. The test.py file contains a simple flowgraph that connects a message strobe to my custom message sink blocks. When I run test.py with either of the blocks on my desktop, it works correctly. However, when I run test.py after cross compiling on the E310, it works correctly with the test_msg_py block and produces the following error with the test_msg block:

Could not find port: in in:

system

Bus error

 

Thanks,

Jessica

 

From: Discuss-gnuradio [mailto:discuss-gnuradio-bounces+jessica.iwamoto=aero.org@gnu.org] On Behalf Of Jessica Iwamoto
Sent: Wednesday, May 10, 2017 9:53 AM
To: discuss-gnuradio@gnu.org
Subject: [Discuss-gnuradio] Custom C++ blocks on E310

 

Hi all,

 

I have built custom C++ blocks that work on my PC, but don't work when cross compiled for the E310. Specifically, I am trying to build a custom C++ block with a message port and cross compile it for the E310. I am using version 3.7.12 of GNU radio and the latest version of the SDK/toolchain for the E310. I have built a simple message sink block with just a message input port and put it in a flowgraph with a message strobe. My code runs correctly on my PC but when I run it on the E310, I get the error:

Could not find port: msg in:

system

Bus error

 

I am able to create custom python blocks with message ports and run them on the E310 and my PC with no issues. Additionally, I am unable to create custom C++ blocks with normal input and output streams on the E310 (the program seg faults when I try to connect the custom block to another block), but they run correctly on my PC. Any suggestions on what could be causing this?

 

Thanks,

Jessica

 

_______________________________________________
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio