Re: [Discuss-gnuradio] std::runtime_error (gdb backtrace included)

[Eric Blossom]

On Fri, Apr 13, 2007 at 03:33:46PM -0600, Tarun Tiwari wrote:
> Hi,
> 
> I am implementing a relay network for voice transmision and reception. I
> using threading to start the GUI and flow graph. I am facing a runtime error
> in random at destination, whereas it works perfectly at the relay node. At
> relay node I have bypassed the audio device and have a connection like this
> :
> USRP--> gsm full rate decoder --> gsm full rate encode --> USRP.
> I ran the program in debugger mode and got following trace/errors from gdb.
> I need help from somebody to resolve this problem.
> 
> """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
> terminate called after throwing an instance of 'std::runtime_error'
>  what():  msg length is not a multiple of d_itemsize

Hi Tarun,

The exception indicates that you sent gr_message_source a message
that wasn't a multiple of the itemsize that you specified in the
constructor.  See line 99 in gr_message_source.cc

How are you calling it?

FYI, I looked at the old gnuradio-examples/python/digital_voice/encdec.py
code, but it's suffered bit rot and was never updated to use the the
revised packet based modulators.  It would take some work to
straighten it out, and I don't have time to pursue that now.

Eric


> Program received signal SIGABRT, Aborted.
> [Switching to Thread 145009568 (LWP 8656)]
> 0x00ef2410 in __kernel_vsyscall ()
> (gdb)
> (gdb) bt
> #0  0x00ef2410 in __kernel_vsyscall ()
> #1  0x0045fee9 in raise () from /lib/libc.so.6
> #2  0x004614f1 in abort () from /lib/libc.so.6
> #3  0x00c39780 in __gnu_cxx::__verbose_terminate_handler ()
>   from /usr/lib/libstdc++.so.6
> #4  0x00c371b5 in std::set_unexpected () from /usr/lib/libstdc++.so.6
> #5  0x00c371f2 in std::terminate () from /usr/lib/libstdc++.so.6
> #6  0x00c3732a in __cxa_throw () from /usr/lib/libstdc++.so.6
> #7  0x006d3cdb in gr_message_source::work (this=0x9234d50,
> noutput_items=4095,
>    address@hidden, address@hidden) at
> gr_message_source.cc:99

... This is where the problem is ...

> #8  0x00701e1a in gr_sync_block::general_work (this=0x9234d50,
>    noutput_items=4095, address@hidden, address@hidden,
>    address@hidden) at gr_sync_block.cc:64
> #9  0x00700022 in gr_single_threaded_scheduler::main_loop (this=0x8d6c960)
>    at gr_single_threaded_scheduler.cc:330
> #10 0x007010a1 in gr_single_threaded_scheduler::run (this=0x8d6c960)
>    at gr_single_threaded_scheduler.cc:86
> #11 0x00205dab in sts_pyrun ()
>   from
> /usr/local/lib/python2.4/site-packages/gnuradio/gr/_gnuradio_swig_py_runtime.so
> #12 0x00214132 in _wrap_sts_pyrun ()
>   from
> /usr/local/lib/python2.4/site-packages/gnuradio/gr/_gnuradio_swig_py_runtime.so


Eric