Uhd_fft segfault

GNU Radio
1

Hi,

I’m new to SDR and gnuradio and trying to get started with an USRP B200
and gnuradio on ubuntu 14.04.
I’m using pybombs (up-to-date) for building. Building succeeds but i get
a segfault when running uhd_fft.
The backtrace is below.

I checked if the correct libuhd was being used (with ldd),instead of an
old version from an ubuntu package.
I also tried uhd_find_devices (which uses pure uhd if i’m correct,
without gnuradio?), this works fine.
Running “pybombs verify gnuradio” results in:
The following tests FAILED:
183 - qa_uhd (Failed)
192 - qa_fcd (Failed)
Errors while running CT

Running gnuradio/gr-uhd/python/uhd/qa_uhd.py in gdb segfaults with a
similar backtrace as well.
Finally, i tried changing the gnuradio recipe to use the maint branch
instead of master.
Rebuilding (after cleaning the build dir) results in the same situation
however.

I don’t know where to look next. Did anyone experience the same problem?
Thanks for any pointers!

(gdb) bt
#0 0x000000000001e626 in ?? ()
#1 0x00007ffff079d3a0 in strstr (__needle=0x7ffff082bfca "swig_ptr: ",
__haystack=0xd9398 <error: Cannot access memory at address 0xd9398>) at
/usr/include/string.h:337
#2 SWIG_Python_FixMethods (methods=0x7ffff0a57380 ,
const_table=0x7ffff0a5d920 <swig_const_table>, types=0x7ffff0a5d980
<swig_types>,
types_initial=0x7ffff0a55a20 <swig_type_initial>) at
/home/glenn/projects/pybombs/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx:47200
#3 init_uhd_swig () at
/home/glenn/projects/pybombs/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx:47321
#4 0x00000000004268bc in _PyImport_LoadDynamicModule
(name=0x7ffff1cccd74 “_uhd_swig”,
pathname=0x7fffed3fa48c
“/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/_uhd_swig.so”,
fp=) at …/Python/importdl.c:53
#5 0x00000000005b75d1 in load_module.39237 (name=,
fp=, pathname=, type=,
loader=loader@entry=0x0)
at …/Python/import.c:1915
#6 0x000000000046232a in imp_load_module.39244 (self=,
args=) at …/Python/import.c:3182
#7 0x000000000052c6d5 in call_function (oparg=,
pp_stack=0x7fffffffc170) at …/Python/ceval.c:4020
#8 PyEval_EvalFrameEx (f=f@entry=
Frame 0x7ffff2182a50, for file
/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py,
line 24, in swig_import_helper (dirname=<function at remote
0x7ffff7f0f578>, imp=<module at remote 0x7ffff6b519f0>, fp=<file at
remote 0x7ffff0aa1f60>,
pathname=‘/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/_uhd_swig.so’,
description=(‘.so’, ‘rb’, 3)), throwflag=throwflag@entry=0) at
…/Python/ceval.c:2666
#9 0x000000000052cf32 in fast_function (nk=,
na=, n=0, pp_stack=0x7fffffffc2b0, func=<function at
remote 0x7fffed3fa398>)
at …/Python/ceval.c:4106
#10 call_function (oparg=, pp_stack=0x7fffffffc2b0) at
…/Python/ceval.c:4041
#11 PyEval_EvalFrameEx (f=f@entry=Frame 0x7ffff1c73b00, for file
/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py,
line 28, in (),
throwflag=throwflag@entry=0) at …/Python/ceval.c:2666
#12 0x000000000055c594 in PyEval_EvalCodeEx (co=0x7fffed40a9b0,
globals=, locals=, args=,
argcount=,
kws=, kwcount=0, defs=0x0, defcount=0, closure=0x0)
at …/Python/ceval.c:3252
#13 0x00000000005b7392 in PyEval_EvalCode (co=,
globals=, locals=) at
…/Python/ceval.c:667
#14 0x00000000005b744a in PyImport_ExecCodeModuleEx
(name=name@entry=0xdf9060 “gnuradio.uhd.uhd_swig”, co=co@entry=<code at
remote 0x7fffed40a9b0>,
pathname=pathname@entry=0xa0f170
“/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.pyc”)
at …/Python/import.c:709
#15 0x0000000000579f0f in load_source_module.39194
(name=name@entry=0xdf9060 “gnuradio.uhd.uhd_swig”,
pathname=0xa0f170
“/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.pyc”,

 pathname@entry=0xa72300

“/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py”,
fp=) at …/Python/import.c:1099
#16 0x00000000005b7541 in load_module.39237 (name=name@entry=0xdf9060
“gnuradio.uhd.uhd_swig”, fp=,
pathname=pathname@entry=0xa72300
“/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py”,
type=, loader=)
at …/Python/import.c:1906
#17 0x000000000055d3a3 in import_submodule.39248 (mod=mod@entry=<module
at remote 0x7ffff1c8aa98>, subname=subname@entry=0xdf906d “uhd_swig”,
fullname=0xdf9060 “gnuradio.uhd.uhd_swig”) at
…/Python/import.c:2700
#18 0x000000000055d77c in load_next (mod=<module at remote
0x7ffff1c8aa98>, altmod=None, p_name=p_name@entry=0x7fffffffc650,
buf=buf@entry=0xdf9060 “gnuradio.uhd.uhd_swig”,
p_buflen=p_buflen@entry=0x7fffffffc660) at …/Python/import.c:2515
#19 0x000000000055db37 in import_module_level.isra.3 (level=-1,
fromlist=None, globals=, name=0x0) at
…/Python/import.c:2224
#20 PyImport_ImportModuleLevel (name=, globals=, locals=, fromlist=None, level=-1) at
…/Python/import.c:2288
#21 0x00000000004755e7 in builtin___import__.32997 (self=, args=, kwds=) at
…/Python/bltinmodule.c:49
#22 0x00000000004da20b in PyObject_Call (kw=0x0,
arg=(‘uhd_swig’, {‘_prepare_uhd_swig’: <function at remote
0x7ffff0adf2a8>, ‘builtins’: {‘bytearray’: <type at remote
0x9166a0>, ‘IndexError’: <type at remote 0x919900>, ‘all’: , ‘help’: <_Helper at remote 0x7ffff7e7d290>, ‘vars’:
, ‘SyntaxError’: <type at remote 0x91b9e0>,
‘unicode’: <type at remote 0x91dc80>, ‘UnicodeDecodeError’: <type at
remote 0x91a920>, ‘memoryview’: <type at remote 0x90dae0>, ‘isinstance’:
, ‘copyright’:
<_Printer(_Printer__data=‘Copyright (c) 2001-2014 Python Software
Foundation.\nAll Rights Reserved.\n\nCopyright (c) 2000 BeOpen.com.\nAll
Rights Reserved.\n\nCopyright (c) 1995-2001 Corporation for National
Research Initiatives.\nAll Rights Reserved.\n\nCopyright (c) 1991-1995
Stichting Mathematisch Centrum, Amsterdam.\nAll Rights Reserved.’,
_Printer__lines=None, _Printer__name=‘copyright’, _Printer__dirs=(),
_Printer__files=(…)) at remote 0x7ffff7e7d590>, ‘NameError’: <type at
remote 0x91bd20>, ‘BytesWarn…(truncated), func=) at …/Objects/abstract.c:2529
#23 PyEval_CallObjectWithKeywords (func=func@entry=,
arg=arg@entry=(‘uhd_swig’, {’_prepare_uhd_swig’: <function at
remote 0x7ffff0adf2a8>, ‘builtins’: {‘bytearray’: <type at remote
0x9166a0>, ‘IndexError’: <type at remote 0x919900>, ‘all’: , ‘help’: <_Helper at remote 0x7ffff7e7d290>, ‘vars’:
, ‘SyntaxError’: <type at remote 0x91b9e0>,
‘unicode’: <type at remote 0x91dc80>, ‘UnicodeDecodeError’: <type at
remote 0x91a920>, ‘memoryview’: <type at remote 0x90dae0>, ‘isinstance’:
, ‘copyright’:
<_Printer(_Printer__data=‘Copyright (c) 2001-2014 Python Software
Foundation.\nAll Rights Reserved.\n\nCopyright (c) 2000 BeOpen.com.\nAll
Rights Reserved.\n\nCopyright (c) 1995-2001 Corporation for National
Research Initiatives.\nAll Rights Reserved.\n\nCopyright (c) 1991-1995
Stichting Mathematisch Centrum, Amsterdam.\nAll Rights Reserved.’,
_Printer__lines=None, _Printer__name=‘copyright’, _Printer__dirs=(),
_Printer__files=(…)) at remote 0x7ffff7e7d590>, ‘NameError’: <type at
remote

2

Those swig traces are hard to parse, but you might have to rebuild GNU
Radio against the current UHD build. Did you install both via Pybombs?

M

3

yes i did, “pybombs list” shows this:

              gnuradio    installed  inventory

fc7861ac029a4297df5a0b1159cb07f922670054
git://http://www.gnuradio.org/git/gnuradio.git
uhd installed inventory
7d97ab60012b99ed92fb122a3a68d68515a404fa
git://https://github.com/EttusResearch/uhd.git

4

I once had an OpenGL issue mess with uhd_fft. If you run ‘glxgears’ from
a terminal does it work and do you get a normal frame rate (30+ fps, I
get up to 60). My fix was installing proper video card drivers. Just a
thought.

Rich

Sent from my iPhone

5

glxgears shows 60 fps (using binary nvidia driver).

just to be complete: i had a linker error first when building gnuradio
using pybombs, which i didn’t yet mention.
The output is shown below. It seemed not critical to me since it happens
when linking an example.
I ‘solved’ it by commenting the “add_subdirectory(examples/c++)” in
gr-uhd/CMakeLists.txt .
Maybe i made a wrong assumption and could this be causing the problem
mentioned before?
Or maybe this error can be helpfull for diagnosing the issue?

Linking CXX executable tags_demo
[ 45%] Built target pygen_gr_uhd_swig_c9605
[ 46%] Built target _uhd_swig
Scanning dependencies of target _vocoder_swig
[ 46%] Built target pygen_gr_vocoder_swig_aa5c8
[ 66%] Built target gnuradio-blocks
[ 66%] Built target pygen_gr_fcd_swig_f8a01
[ 66%] [ 66%] Built target pygen_gr_wavelet_swig_e3597
Building CXX object
gr-vocoder/swig/CMakeFiles/_vocoder_swig.dir/vocoder_swigPYTHON_wrap.cxx.o
[ 66%] Built target _wxgui_swig
[ 66%] Built target pygen_gr_wxgui_swig_bf89e
[ 66%] Built target gr_runtime_test
[ 66%] Built target gr_pmt_test
Scanning dependencies of target test-gr-blocks
[ 66%] Built target pmt_swig
Scanning dependencies of target _blocks_swig0
/home/glenn/bin/gnuradio/lib/libuhd.so: undefined reference to
`libusb_error_name’
collect2: error: ld returned 1 exit status
make[2]: *** [gr-uhd/examples/c++/tags_demo] Error 1
make[1]: *** [gr-uhd/examples/c++/CMakeFiles/tags_demo.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs…
[ 66%] [ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/test_gr_blocks.cc.o
Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_block.cc.o
[ 66%] Building CXX object
gr-blocks/swig/CMakeFiles/_blocks_swig0.dir/blocks_swig0PYTHON_wrap.cxx.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_top_block.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_hier_block2.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_hier_block2_derived.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_blocks.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_block_tags.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_rotator.cc.o
Linking CXX executable test-gr-blocks
[ 66%] Built target test-gr-blocks
Linking CXX shared module _vocoder_swig.so
[ 66%] Built target _vocoder_swig
Linking CXX shared module _blocks_swig0.so
[ 66%] Built target _blocks_swig0
make: *** [all] Error 2
Build failed. See output above for error messages.

6

On 02/17/2015 09:35 AM, Tom R. wrote:

when linking an example.
Scanning dependencies of target _vocoder_swig
Scanning dependencies of target test-gr-blocks
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/test_gr_blocks.cc.o
[ 66%] Building CXX object
[ 66%] Built target _blocks_swig0

rnd uhd" and then rerun “./pybombs install uhd”. Then do the same for
gnuradio and see if that completes.

If you have /any/ error when building GNU Radio, this suggests a
deeper problem.

Tom

For B2xx support, you need a version of libusb that has
libusb_error_name() – older versions of the library don’t have this
API, and that’s why
you’re getting the linker error.

7

On Tue, Feb 17, 2015 at 6:04 AM, Ergeerts Glenn <
[email protected]> wrote:

Or maybe this error can be helpfull for diagnosing the issue?
Building CXX object
collect2: error: ld returned 1 exit status
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_top_block.cc.o
Linking CXX executable test-gr-blocks
[ 66%] Built target test-gr-blocks
Linking CXX shared module _vocoder_swig.so
[ 66%] Built target _vocoder_swig
Linking CXX shared module _blocks_swig0.so
[ 66%] Built target _blocks_swig0
make: *** [all] Error 2
Build failed. See output above for error messages.

Yes, this is definitely a problem that is likely related to your
original
question. This error here is showing an issue with libusb and libuhd,
which
would need to work together for you to run uhd_fft. It looks like
something
is confused in your build of UHD with regards to USB support. I would
try
reinstalling UHD. Remove it with “./pybombs rnd uhd” and then rerun
“./pybombs install uhd”. Then do the same for gnuradio and see if that
completes.

If you have /any/ error when building GNU Radio, this suggests a deeper
problem.

Tom

8

i have libusb-1.0-0-dev version 1.0.17-1ubuntu2 installed.
However, doing ldd on libuhd.so showed that
/usr/local/lib/libusb-1.0.so.0 was used instead of the version from
/usr/lib/ .
I’m not sure how it came there, i suspect from a PPA package i tried
installing before reverting to pybombs.
After removing this file ldd now pick the correct libusb and gnuradio
builds fine!
I have not been able to test it with the USRP connected but uhd_fft does
not segfaults anymore so it seems fixed.

Thanks for the help and sorry for not providing this information up
front!

On 02/17/2015 03:57 PM, Marcus D. Leech wrote:
On 02/17/2015 09:35 AM, Tom R. wrote:
On Tue, Feb 17, 2015 at 6:04 AM, Ergeerts Glenn
<[email protected]mailto:[email protected]>
wrote:
glxgears shows 60 fps (using binary nvidia driver).

just to be complete: i had a linker error first when building gnuradio
using pybombs, which i didn’t yet mention.
The output is shown below. It seemed not critical to me since it happens
when linking an example.
I ‘solved’ it by commenting the “add_subdirectory(examples/c++)” in
gr-uhd/CMakeLists.txt .
Maybe i made a wrong assumption and could this be causing the problem
mentioned before?
Or maybe this error can be helpfull for diagnosing the issue?

Linking CXX executable tags_demo
[ 45%] Built target pygen_gr_uhd_swig_c9605
[ 46%] Built target _uhd_swig
Scanning dependencies of target _vocoder_swig
[ 46%] Built target pygen_gr_vocoder_swig_aa5c8
[ 66%] Built target gnuradio-blocks
[ 66%] Built target pygen_gr_fcd_swig_f8a01
[ 66%] [ 66%] Built target pygen_gr_wavelet_swig_e3597
Building CXX object
gr-vocoder/swig/CMakeFiles/_vocoder_swig.dir/vocoder_swigPYTHON_wrap.cxx.o
[ 66%] Built target _wxgui_swig
[ 66%] Built target pygen_gr_wxgui_swig_bf89e
[ 66%] Built target gr_runtime_test
[ 66%] Built target gr_pmt_test
Scanning dependencies of target test-gr-blocks
[ 66%] Built target pmt_swig
Scanning dependencies of target _blocks_swig0
/home/glenn/bin/gnuradio/lib/libuhd.so: undefined reference to
`libusb_error_name’
collect2: error: ld returned 1 exit status
make[2]: *** [gr-uhd/examples/c++/tags_demo] Error 1
make[1]: *** [gr-uhd/examples/c++/CMakeFiles/tags_demo.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs…
[ 66%] [ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/test_gr_blocks.cc.o
Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_block.cc.o
[ 66%] Building CXX object
gr-blocks/swig/CMakeFiles/_blocks_swig0.dir/blocks_swig0PYTHON_wrap.cxx.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_top_block.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_hier_block2.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_gr_hier_block2_derived.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_blocks.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_block_tags.cc.o
[ 66%] Building CXX object
gr-blocks/lib/CMakeFiles/test-gr-blocks.dir/qa_rotator.cc.o
Linking CXX executable test-gr-blocks
[ 66%] Built target test-gr-blocks
Linking CXX shared module _vocoder_swig.so
[ 66%] Built target _vocoder_swig
Linking CXX shared module _blocks_swig0.so
[ 66%] Built target _blocks_swig0
make: *** [all] Error 2
Build failed. See output above for error messages.

Yes, this is definitely a problem that is likely related to your
original question. This error here is showing an issue with libusb and
libuhd, which would need to work together for you to run uhd_fft. It
looks like something is confused in your build of UHD with regards to
USB support. I would try reinstalling UHD. Remove it with “./pybombs rnd
uhd” and then rerun “./pybombs install uhd”. Then do the same for
gnuradio and see if that completes.

If you have /any/ error when building GNU Radio, this suggests a deeper
problem.

Tom

For B2xx support, you need a version of libusb that has
libusb_error_name() – older versions of the library don’t have this
API, and that’s why
you’re getting the linker error.

On 02/17/2015 01:37 AM, Richard B. wrote:

              gnuradio    installed  inventory

Running gnuradio/gr-uhd/python/uhd/qa_uhd.py in gdb segfaults with a
(gdb) bt

/home/glenn/projects/pybombs/src/gnuradio/build/gr-uhd/swig/uhd_swigPYTHON_wrap.cxx:47321

args=) at …/Python/import.c:3182
…/Python/ceval.c:2666
#12 0x000000000055c594 in PyEval_EvalCodeEx (co=0x7fffed40a9b0,

“/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.pyc”)

“gnuradio.uhd.uhd_swig”, fp=,
p_buflen=p_buflen@entry=0x7fffffffc660) at …/Python/import.c:2515
0x7ffff0adf2a8>, ‘builtins’: {‘bytearray’: <type at remote
Stichting Mathematisch Centrum, Amsterdam.\nAll Rights Reserved.',
, ‘SyntaxError’: <type at remote 0x91b9e0>,
remote
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