[Discuss-gnuradio] uhd_fft segfault

[Ergeerts Glenn]

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 <SwigMethods>, 
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=<optimized out>) at ../Python/importdl.c:53
#5  0x00000000005b75d1 in load_module.39237 (name=<optimized out>, 
fp=<optimized out>, pathname=<optimized out>, type=<optimized out>, 
address@hidden)
     at ../Python/import.c:1915
#6  0x000000000046232a in imp_load_module.39244 (self=<optimized out>, 
args=<optimized out>) at ../Python/import.c:3182
#7  0x000000000052c6d5 in call_function (oparg=<optimized out>, 
pp_stack=0x7fffffffc170) at ../Python/ceval.c:4020
#8  PyEval_EvalFrameEx (address@hidden
     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)), address@hidden) at 
../Python/ceval.c:2666
#9  0x000000000052cf32 in fast_function (nk=<optimized out>, 
na=<optimized out>, n=0, pp_stack=0x7fffffffc2b0, func=<function at 
remote 0x7fffed3fa398>)
     at ../Python/ceval.c:4106
#10 call_function (oparg=<optimized out>, pp_stack=0x7fffffffc2b0) at 
../Python/ceval.c:4041
#11 PyEval_EvalFrameEx (address@hidden 0x7ffff1c73b00, for file 
/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py, 
line 28, in <module> (),
     address@hidden) at ../Python/ceval.c:2666
#12 0x000000000055c594 in PyEval_EvalCodeEx (co=0x7fffed40a9b0, 
globals=<optimized out>, locals=<optimized out>, args=<optimized out>, 
argcount=<optimized out>,
     kws=<optimized out>, kwcount=0, defs=0x0, defcount=0, closure=0x0) 
at ../Python/ceval.c:3252
#13 0x00000000005b7392 in PyEval_EvalCode (co=<optimized out>, 
globals=<optimized out>, locals=<optimized out>) at ../Python/ceval.c:667
#14 0x00000000005b744a in PyImport_ExecCodeModuleEx 
(address@hidden "gnuradio.uhd.uhd_swig", address@hidden<code at 
remote 0x7fffed40a9b0>,
     address@hidden 
"/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 
(address@hidden "gnuradio.uhd.uhd_swig",
     pathname=0xa0f170 
"/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.pyc",
 

     address@hidden 
"/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py",
 
fp=<optimized out>) at ../Python/import.c:1099
#16 0x00000000005b7541 in load_module.39237 (address@hidden 
"gnuradio.uhd.uhd_swig", fp=<optimized out>,
     address@hidden 
"/home/glenn/bin/gnuradio/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py",
 
type=<optimized out>, loader=<optimized out>)
     at ../Python/import.c:1906
#17 0x000000000055d3a3 in import_submodule.39248 (address@hidden<module 
at remote 0x7ffff1c8aa98>, address@hidden "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, address@hidden,
     address@hidden "gnuradio.uhd.uhd_swig", 
address@hidden) at ../Python/import.c:2515
#19 0x000000000055db37 in import_module_level.isra.3 (level=-1, 
fromlist=None, globals=<optimized out>, name=0x0) at ../Python/import.c:2224
#20 PyImport_ImportModuleLevel (name=<optimized out>, globals=<optimized 
out>, locals=<optimized out>, fromlist=None, level=-1) at 
../Python/import.c:2288
#21 0x00000000004755e7 in builtin___import__.32997 (self=<optimized 
out>, args=<optimized out>, kwds=<optimized out>) 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': <built-in 
function all>, 'help': <_Helper at remote 0x7ffff7e7d290>, 'vars': 
<built-in function vars>, 'SyntaxError': <type at remote 0x91b9e0>, 
'unicode': <type at remote 0x91dc80>, 'UnicodeDecodeError': <type at 
remote 0x91a920>, 'memoryview': <type at remote 0x90dae0>, 'isinstance': 
<built-in function 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=<built-in function 
__import__>) at ../Objects/abstract.c:2529
#23 PyEval_CallObjectWithKeywords (address@hidden<built-in function 
__import__>,
     address@hidden('uhd_swig', {'_prepare_uhd_swig': <function at 
remote 0x7ffff0adf2a8>, '__builtins__': {'bytearray': <type at remote 
0x9166a0>, 'IndexError': <type at remote 0x919900>, 'all': <built-in 
function all>, 'help': <_Helper at remote 0x7ffff7e7d290>, 'vars': 
<built-in function vars>, 'SyntaxError': <type at remote 0x91b9e0>, 
'unicode': <type at remote 0x91dc80>, 'UnicodeDecodeError': <type at 
remote 0x91a920>, 'memoryview': <type at remote 0x90dae0>, 'isinstance': 
<built-in function 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