Segmentation fault issue with gr_hier_block2_detail::connect

Hello GNU-Radio list,

I wonder why is my C++ code is thorwing a segmentation fault (core
dumped),
gdb outputs:

Program received signal SIGSEGV, Segmentation fault.
0xb7b1b718 in
gr_hier_block2_detail::connect(boost::shared_ptr<gr_basic_block>, int,
boost::shared_ptr<gr_basic_block>, int) ()
from /usr/local/lib/libgnuradio-core-3.6.5.so.0.0.0

I confirm that the same line of code which is throwing that error is
executed multiple (randomly) times before it came to that error.

I can’t figure out what is causing that and how to fix it ?
All explanation are welcome.

Regards,


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And when I run again sometimes it stops and throw another segfault in
the
same location but labeled:

Program received signal SIGSEGV, Segmentation fault.
0xb7af75f3 in gr_flowgraph::check_dst_not_used(gr_endpoint const&) ()
from
/usr/local/lib/libgnuradio-core-3.6.5.so.0.0.0


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Could you provide us with a backtrace (in GDB: “bt”) and if possible
with the code that you use to produce this error.
Usually, connect does not cause segfaults, a problem arises if you a)
connect a block that does not exist yet (eg. in its constructor) b)
connect a block in multiple flowgraphs.

Greetings,
Marcus

Thank you Marcus for the reply,

I just figured out where was the problem:
I am TWICE instantiating an object (a shared pointer) outside an if loop
and inside of it,

And for the backtrace it gives me that
… in main (argc=<error reading variable: Cannot access memory at
address
0x0>,
argv=<error reading variable: Cannot access memory at address 0x4>)

Actually I fixed the issue.

Cheers


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