Re: Import Error "undefined symbol"

Looks like gnuradio-companion is trying to open the previous flowgraph with the old blocks.

Try renaming that file or removing if from the list of open files in your "~/.gnuradio/grc.conf".

---

From: Beckmann, Niklas [mailto:niklas.beckmann1@rwth-aachen.de]

Sent: Monday, March 20, 2023 at 19:49 UTC+1

Subject: Import Error "undefined symbol"

Hello Vasil,

I hope this is what you meant:

niklas@niklas~$ gdb --ex run --args python $(which gnuradio-companion)

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Reading symbols from python...

(No debugging symbols found in python)

Starting program: /usr/bin/python /usr/bin/gnuradio-companion

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

[New Thread 0x7ffff649c700 (LWP 7650)]

[New Thread 0x7ffff5c9b700 (LWP 7651)]

[New Thread 0x7ffff549a700 (LWP 7652)]

[New Thread 0x7ffff4c99700 (LWP 7653)]

[New Thread 0x7ffff4498700 (LWP 7654)]

[New Thread 0x7ffff3c97700 (LWP 7655)]

[New Thread 0x7ffff3496700 (LWP 7656)]

[New Thread 0x7ffff2c95700 (LWP 7657)]

[New Thread 0x7ffff2494700 (LWP 7658)]

[New Thread 0x7ffff1c93700 (LWP 7659)]

[Detaching after fork from child process 7660]

[New Thread 0x7fffed2da700 (LWP 7663)]

[New Thread 0x7fffecad9700 (LWP 7664)]

[New Thread 0x7fffe7dff700 (LWP 7665)]

[Detaching after fork from child process 7666]

>>> Warning: vocoder_codec2_decode_ps - option_attributes are for enums only, ignoring

>>> Warning: vocoder_codec2_encode_sp - option_attributes are for enums only, ignoring

[New Thread 0x7fffdbfff700 (LWP 7678)]

[New Thread 0x7fffdb7fe700 (LWP 7679)]

<<< Welcome to GNU Radio Companion 3.10.5.0 >>>

Block paths:

/home/niklas/.grc_gnuradio

/usr/share/gnuradio/grc/blocks

/usr/local/share/gnuradio/grc/blocks

Loading: "/home/niklas/Workspace/Niklas_flowgraphs/Transceiver_Station_1.grc"

[Thread 0x7fffdbfff700 (LWP 7678) exited]

[Detaching after fork from child process 7681]

--Type <RET> for more, q to quit, c to continue without paging--RET

Thread 1 "python" received signal SIGSEGV, Segmentation fault.

0x00007fffc9d1340b in ?? ()

   from /usr/lib/python3/dist-packages/gnuradio/digital/digital_python.cpython-38-x86_64-linux-gnu.so

(gdb) backtrace

#0  0x00007fffc9d1340b in  ()

    at /usr/lib/python3/dist-packages/gnuradio/digital/digital_python.cpython-38-x86_64-linux-gnu.so

#1  0x00007fffc9d94a02 in  ()

    at /usr/lib/python3/dist-packages/gnuradio/digital/digital_python.cpython-38-x86_64-linux-gnu.so

#2  0x00000000005f5b39 in PyCFunction_Call ()

#3  0x00000000005f6706 in _PyObject_MakeTpCall ()

#4  0x000000000050ba83 in  ()

#5  0x0000000000570b82 in _PyEval_EvalFrameDefault ()

#6  0x0000000000569d8a in _PyEval_EvalCodeWithName ()

#7  0x000000000068e267 in PyEval_EvalCode ()

#8  0x000000000067d9b1 in  ()

#9  0x000000000067da2f in  ()

#10 0x000000000067dc1f in PyRun_StringFlags ()

#11 0x000000000060091e in  ()

#12 0x00000000005c4790 in  ()

#13 0x000000000056bab6 in _PyEval_EvalFrameDefault ()

#14 0x0000000000569d8a in _PyEval_EvalCodeWithName ()

#15 0x00000000005f60c3 in _PyFunction_Vectorcall ()

#16 0x000000000056bbe1 in _PyEval_EvalFrameDefault ()

#17 0x00000000005f5ee6 in _PyFunction_Vectorcall ()

#18 0x000000000056bbe1 in _PyEval_EvalFrameDefault ()

Thank you for helping

---

Von: Vasil Velichkov <vvvelichkov@gmail.com>
Gesendet: Montag, 20. März 2023 18:58:46
An: Beckmann, Niklas
Cc: discuss-gnuradio@gnu.org
Betreff: Re: AW: Import Error "undefined symbol"

 

Hi Niklas

On 20/03/2023 19.19, Beckmann, Niklas wrote:
>  but... I am not able to open gnuradio anymore:
>
>
> <<< Welcome to GNU Radio Companion 3.10.5.0 >>>
>
> Block paths:
> /home/niklas/.grc_gnuradio
> /usr/share/gnuradio/grc/blocks
> /usr/local/share/gnuradio/grc/blocks
>
> Loading: "/home/niklas/Workspace/Niklas_flowgraphs/Transceiver_Station_1.grc"
> Segmentation fault (core dumped)

Start gnuradio under gdb, in your terminal execute

  gdb --ex run --args python $(which gnuradio-companion)

When it stops and you get "Segmentation fault (core dumped)" then take a backtrace

  (gdb) backtrace

and provide the full output.

Regards,
Vasil