Re: [Discuss-gnuradio] free(): invalid pointer for AM demod block at Gnuradio 3.7.13.5

[Ben Hilburn]

Nice catch, Volker! Glad you're up and running, Ignatius.

And you're right, this should be emitting an error message that's actually useful - the output here really didn't help at all. I've opened a bug on Github in reference to this. It should be relatively straight-forward to tackle, which makes it a great issue for a beginner contributor!

https://github.com/gnuradio/gnuradio/issues/2493

Cheers,

Ben

On Tue, May 14, 2019 at 6:27 PM Ignatius Rivaldi <address@hidden> wrote:

Ahh that solves it, I thought that was a bandpass filter and passband
frequency is the lower cutoff frequency, thanks

On Wed, May 15, 2019 at 2:07 AM Volker Schroer <address@hidden> wrote:
>
> You have set passband frequency to 0 ! So your passband reaches from 0
> to 0. That make no sense. Probably a parameter check should be
> introduced to the demod block Further  you should add a throttle block
> after your source.
>
> Same problem can be found in 3.8.
>
>
> Am 14.05.19 um 15:02 schrieb Ignatius Rivaldi:
> > I'm running Arch Linux with Gnu Radio 3.7.13.5 and
> > Python 2.7.16 (default, Mar 11 2019, 18:59:25)
> > [GCC 8.2.1 20181127] on linux2
> >
> > and if I try to use AM demod block with anything the flowgraph crashes
> > with this:
> >
> >>>> Warning: This flow graph may not have flow control: no audio or RF hardware blocks found. Add a Misc->Throttle block to your flow graph to avoid CPU congestion.
> >
> > Executing: /usr/bin/python2 -u /home/feanor/Development/SDR/top_block.py
> >
> > free(): invalid pointer
> >
> >>>> Done
> >
> > This is just a AM demod block with null sink and null source attached
> > to it, reproduction flowgraph is attached to this email
> >
> >
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> >
>
>
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