[Discuss-gnuradio] usrp_spectrum_sense.py segmentation fault problem

[Sebastian Döring]

Hello list,

since I got no answer to my last post, I guess what I 
wrote wasn´t that helpful.
I apologize for whatever I did not understand, but I am 
not familiar with error logs in the context of the problem 
I have here.
I would really appreciate any help with this.

Once again my problem: I am getting the famous 
segmentation fault when trying to launch the 
usrp_spectrum_sense.py-script.
When asked for an error log, I simply launched it in GDB 
and copy pasted the output plus backtrace.

My OS is Ubuntu 10.04, running on a 32-bit machine. 
Default python version is 2.6. My hardware is the USRP 
N210 with XCVR2450.

I tried to change my default python version (tried 2.5 and 
2.7) but it did not help ( but I am also not sure if I 
have changed all the necessary paths correctly).
Nevertheless I returned to 2.6 and have even reinstalled 
the GNUraduio package (using the build-script)  --> 
nothing changed.

uhd_fft.py and so on is working but I really need to get 
the above mentioned script running, to modify it later on.


Thanks in advance for your answers.

-Sebastian


On Thu, 15 Dec 2011 12:40:02 +0100
 "Sebastian Döring" <address@hidden> wrote:
> On Wed, 14 Dec 2011 08:28:57 -0500
>  "Marcus D. Leech" <address@hidden> wrote:
> > On 14/12/11 08:05 AM, Sebastian Döring wrote:
> > > Thanks a lot. Code really looks like what I am looking 
> > > for.
> > > Concerning the machine+Python version combinations that 
> > > cause seg
> > > faults: Is there a known combination that works?
> > > Seems like mine doesn't.
> > >
> > > -Sebastian
> > Could you expand on that a bit, please?  Perhaps with an 
> > error log, and
> > what you were trying to do when
> >  you got a segfault?
> >
> >
> >
> > --
> > Principal Investigator
> > Shirleys Bay Radio Astronomy Consortium
> > http://www.sbrac.org
>
>
> I was simply trying to test the script 
> (usrp_spectrum_sense.py 2.4G 2.41G).
>
> I have reproduced the error using gdb and this is what I 
> get:
> ------------------------------------------------------------------------------------------------------
> Starting program: /usr/bin/python usrp_spectrum_sense.py 
> 2.4G 2.41G
> [Thread debugging using libthread_db enabled]
> linux; GNU C++ version 4.4.3; Boost_104000; 
> UHD_003.004.000-71810ad
>
> Warning: this is known to have issues on some 
> machines+Python version combinations to seg fault due to 
> the callback in bin_statitics. If you figure out why, 
> we'd love to hear about it!
> -- Opening a USRP2/N-Series device...
> -- Current recv frame size: 1472 bytes
> -- Current send frame size: 1472 bytes
> [New Thread 0xb6afbb70 (LWP 8791)]
> [New Thread 0xb62fab70 (LWP 8792)]
> gain = 49.5
> [New Thread 0xb5a99b70 (LWP 8793)]
> [New Thread 0xb5298b70 (LWP 8794)]
> [New Thread 0xb4a56b70 (LWP 8795)]
> [New Thread 0xb40ffb70 (LWP 8796)]
> [New Thread 0xb38feb70 (LWP 8797)]
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 0xb38feb70 (LWP 8797)]
> 0x0013a455 in sem_post@@GLIBC_2.1 () from 
> /lib/tls/i686/cmov/libpthread.so.0
> ------------------------------------------------------------------------------------------------------
>
> The backtrace says:
> ------------------------------------------------------------------------------------------------------
> #0  0x0013a455 in sem_post@@GLIBC_2.1 () from 
> /lib/tls/i686/cmov/libpthread.so.0
> #1  0x0810ab61 in PyThread_release_lock (lock=0x0) at 
> ../Python/thread_pthread.h:374
> #2  0x080dbad3 in PyEval_ReleaseLock () at 
> ../Python/ceval.c:262
> #3  0x00fa6073 in gr_py_feval_dd::calleval(double) ()
>    from 
> /usr/local/lib/python2.6/dist-packages/gnuradio/gr/_gnuradio_core_general.so
> #4  0x0083a6cd in 
> gr_bin_statistics_f::enter_tune_delay() ()
>    from 
> /usr/local/lib/libgnuradio-core-3.5.0rc0.so.0.0.0
> #5  0x0083a788 in gr_bin_statistics_f::work(int, 
> std::vector<void const*, std::allocator<void const*> >&, 
> std::vector<void*, std::allocator<void*> >&) () from 
> /usr/local/lib/libgnuradio-core-3.5.0rc0.so.0.0.0
> #6  0x007d70e7 in gr_sync_block::general_work(int, 
> std::vector<int, std::allocator<int> >&, std::vector<void 
> const*, std::allocator<void const*> >&, 
> std::vector<void*, std::allocator<void*> >&) ()
>    from 
> /usr/local/lib/libgnuradio-core-3.5.0rc0.so.0.0.0
> #7  0x007ba475 in gr_block_executor::run_one_iteration() 
> ()
>    from 
> /usr/local/lib/libgnuradio-core-3.5.0rc0.so.0.0.0
> #8  0x007da549 in 
> gr_tpb_thread_body::gr_tpb_thread_body(boost::shared_ptr<gr_block>) 
> ()
>    from 
> /usr/local/lib/libgnuradio-core-3.5.0rc0.so.0.0.0
> #9  0x007d3fcd in 
> boost::detail::function::void_function_obj_invoker0<gruel::thread_body_wrapper<tpb_container>, 
> void>::invoke(boost::detail::function::function_buffer&) 
> () from /usr/local/lib/libgnuradio-core-3.5.0rc0.so.0.0.0
> #10 0x009515f5 in 
> boost::detail::thread_data<boost::function0<void> 
> > ::run() ()
>    from /usr/local/lib/libgruel-3.5.0rc0.so.0.0.0
> #11 0x009db7c5 in thread_proxy () from 
> /usr/lib/libboost_thread.so.1.40.0
> #12 0x0013396e in start_thread () from 
> /lib/tls/i686/cmov/libpthread.so.0
> #13 0x003f1a4e in clone () from 
> /lib/tls/i686/cmov/libc.so.6
> ------------------------------------------------------------------------------------------------------
>
> -Sebastian