Re: [Discuss-gnuradio] trellis_encoder_bb segfaults when inside hier_block

[Martin Braun]

On Mon, Aug 02, 2010 at 02:07:38PM -0700, Eric Blossom wrote:
> On Mon, Aug 02, 2010 at 06:00:10PM +0200, Martin Braun wrote:
> > Sorry for the double-post, we were having problems with our SMTP today.
> > 
> > On Mon, Aug 02, 2010 at 02:54:48PM +0200, Martin Braun wrote:
> > > chancoding_industrystd_encoder_bb::chancoding_industrystd_encoder_bb ()
> > >   : gr_hier_block2 ("industrystd_encoder_bb",
> > >     gr_make_io_signature (1, 1, sizeof(char)),
> > >     gr_make_io_signature (1, 1, sizeof(char)))
> > > {
> > >   trellis_encoder_bb_sptr encoder = 
> > > trellis_encoder_bb_sptrllis_make_encoder_bb(fsm(1, 2, make_G()), 0);
> > 
> > This was a typo due to pasting into the email window.
> > make_G() returns a generator matrix, just in case someone wonders.
> > 
> > Besides, I just figured out that the same happens when I use an FIR
> > filter instead.
> > Here's how I create segfaults every time:
> > 
> > - create a hier_block in C++
> > - internally connect an FIR filter (e.g. fir_filter_fff)
> > - do anything with that block.
> > 
> > Looks like this has nothing to do with gr-trellis. If this looks like a
> > bug to any of the devs and not like a mistake on my end, I'll rig up a
> > test case for downloading if necessary.
> 
> Not sure if it's a bug or not.  
> Please cook up a small test case that shows the problem.

Hi Eric,

I've created a small out-of-tree module available at
http://mbant.de/testcrash.tar.gz.

./bootstrap && ./configure && make check 
segfaults every time.
I tried it on two machines (32- and 64-Bit Ubuntus), with different GNU
Radio versions (precisely: 3.2.2 and current trunk) and different gcc's
(4.4.1 and 4.4.3).

Thanks,
MB

-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
Research Associate

Kaiserstraße 12
Building 05.01
76131 Karlsruhe

Phone: +49 721 608-3790
Fax: +49 721 608-6071
www.cel.kit.edu

KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association

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