Why does this dump core?

As briefly discussed on IRC last night,  I am trying to modify someone else’s block to be more robust (detect or eliminate packet drops). In the ctor, I call message_port_register_out() and it dumps core. The offending call is here: https://github.com/jwmelto/gr-cyberradio/blob/7b048a14f76b140f5cd3edd7d8dfa533e1f892a7/gr-CyberRadio/lib/vita_udp_rx_impl.cc#L427

 

The stack trace from the core is

#0  0x00007ffff4b04973 in pmt::is_pair(boost::shared_ptr<pmt::pmt_base> const&) () from /usr/local/lib64/libgnuradio-pmt.so.3.8.2

#1  0x00007ffff4b07328 in pmt::assv(boost::shared_ptr<pmt::pmt_base>, boost::shared_ptr<pmt::pmt_base>) () from /usr/local/lib64/libgnuradio-pmt.so.3.8.2

#2  0x00007ffff4b075fd in pmt::dict_has_key(boost::shared_ptr<pmt::pmt_base> const&, boost::shared_ptr<pmt::pmt_base> const&) () from /usr/local/lib64/libgnuradio-pmt.so.3.8.2

#3  0x00007ffff73b72e2 in gr::basic_block::message_port_register_out(boost::shared_ptr<pmt::pmt_base>) () from /usr/local/lib64/libgnuradio-runtime.so.3.8.2

#4  0x00007ffff7b58d73 in gr::CyberRadio::vita_udp_rx_impl::vita_udp_rx_impl (this=0x622800, cfg=..., __in_chrg=<optimized out>, __vtt_parm=<optimized out>)

    at /tmp/gr-cyberradio/gr-CyberRadio/lib/vita_udp_rx_impl.cc:427

#5  0x00007ffff7b56cb3 in gr::CyberRadio::vita_udp_rx::make (cfg=...) at /tmp/gr-cyberradio/gr-CyberRadio/lib/vita_udp_rx_impl.cc:111

#6  0x000000000040c51d in main (argc=1, argv=0x7fffffffdf18) at /usr/src/project/main.cc:23

 

My minimal test program is here:

#include <CyberRadio/vita_udp_rx.h>

#include <gnuradio/top_block.h>

#include <gnuradio/blocks/file_sink.h>

 

int main(int argc, char** argv)

{

gr::CyberRadio::vita_udp_rx::Cfg cfg;

 

cfg.src_ip = "192.168.110.10";

cfg.port = 8010;

cfg.header_byte_offset = 48;

cfg.samples_per_packet = 1024;

cfg.bytes_per_packet = 4152;

cfg.swap_bytes = true;

cfg.swap_iq = false;

cfg.tag_packets = true;

cfg.uses_v49_1 = false;

 

cfg.debug = true;

 

auto v49 = gr::CyberRadio::vita_udp_rx::make(cfg); // core dump

auto sink = gr::blocks::file_sink::make(sizeof(gr_complex), "test.dat");

 

auto top = gr::make_top_block("Test");

top->connect(v49, 0, sink, 0);

 

return 0;

}

 

According to all that I know, this should work. It clearly does not. I would appreciate any pointers on how to get past this roadblock.

---

Jim Melton

 

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