Asking help about gr-ieee802.11

hi. I am newbie of gnuradio.i try run wifi_loopback.grc, all the port
are connected.but when i run it comes out with this messege below:

Generating: “/home/user/gr-ieee802-11/examples/wifi_loopback.py”

Warning: This flow graph may not have flow control: no audio or RF hardware
blocks found. Add a Misc->Throttle block to your flow graph to avoid CPU
congestion.

Executing: “/home/user/gr-ieee802-11/examples/wifi_loopback.py”

linux; GNU C++ version 4.8.2; Boost_105400;
UHD_003.009.git-171-g51bc00ee

Using Volk machine: avx_64_mmx_orc
OFDM MAPPER: encoding: 0
set_min_output_buffer on block 31 to 96000
set_min_output_buffer on block 33 to 96000
set_min_output_buffer on block 35 to 96000
set_min_output_buffer on block 36 to 96000
set_min_output_buffer on block 39 to 96000
set_min_output_buffer on block 50 to 96000

Done (return code -11)

below is my system info:
[email protected]:~$ python -V
Python 2.7.6
[email protected]:~$ gnuradio-config-info -v
3.7.7.1
[email protected]:~$ uname -a
Linux userr-X455LDB 3.13.0-53-generic #89-Ubuntu SMP Wed May 20 10:34:39
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
[email protected]:~$ gcc --version
gcc (Ubuntu 4.8.2-19ubuntu1) 4.8.2
Copyright © 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is
NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

[email protected]:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION=“Ubuntu 14.04.2 LTS”

what can i do? i hope you can help me.
thanks

Hi Nur,

the actual error message is not shown in your output. I think you should
run the flow graph in gdb with something like

gbd python
gdb-prompt> run /home/user/gr-ieee802-11/examples/wifi_loopback.py

once you hit the error
gdb-prompt> bt

Best,
Bastian

set_min_output_buffer on block 36 to 96000
3.7.7.1

Discuss-gnuradio mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/discuss-gnuradio


Dipl.-Inform. Bastian B.
Distributed Embedded Systems Group
University of Paderborn, Germany
http://www.ccs-labs.org/~bloessl/

[email protected]:~$ /home/user/gr-ieee802-11/examples/wifi_loopback.py
linux; GNU C++ version 4.8.2; Boost_105400;
UHD_003.009.git-171-g51bc00ee

Using Volk machine: avx_64_mmx_orc
OFDM MAPPER: encoding: 0
set_min_output_buffer on block 31 to 96000
set_min_output_buffer on block 33 to 96000
set_min_output_buffer on block 35 to 96000
set_min_output_buffer on block 36 to 96000
set_min_output_buffer on block 39 to 96000
set_min_output_buffer on block 50 to 96000
Segmentation fault (core dumped)

Dear Nur,

it would be very helpful if you could wrap you console output into one
or two sentences describing what you did.

I have no idea where the error message comes from and would suggest you
go to /home/user/gr-ieee802-11/ and do a
git reset --hard
then open examples/wifi_phy_hier.grc and build it. Then open
examples/wifi_loopback.grc and run it.

Best,
Bastian

(gdb) run /home/user/gr-ieee802-11/examples/wifi_loopback.py
Starting program: /home/user/gr-ieee802-11/examples/wifi_loopback.py
No executable file specified.
Use the “file” or “exec-file” command.
(gdb) bt
No stack.
what can i do?i hope you can help me.

Preferences file: /home/user/.grc
Block paths:
/usr/local/share/gnuradio/grc/blocks
/home/user/.grc_gnuradio

Loading: “/home/user/gr-ieee802-11/examples/wifi_phy_hier.grc”

Done

Showing: “/home/user/gr-ieee802-11/examples/wifi_phy_hier.grc”

Generating: “/home/user/.grc_gnuradio/wifi_phy_hier.py”

Generating: “/home/user/.grc_gnuradio/wifi_phy_hier.py”

Executing: “/home/user/.grc_gnuradio/wifi_phy_hier.py”

Done

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