Re: Getting `Assertion s < d_bufsize' failed` error

[Ed Criscuolo]

Looks like a memory allocation failed. 

@(^.^)@ Ed

Sent from my iPhone

On Apr 22, 2021, at 11:15 AM, Roman A Sandler <rsandler00@gmail.com> wrote:

Hi, I am running some simulations w/ GNURadio where I run top blocks repeatedly inside a nested for loop in python. e.g.:

```
for scheme_set in range(len(schemes)):
    name = scheme_names[scheme_set]
    for snr_set in snr_list:
        print(color.GREEN + 'Starting modulation scheme: ' + name + ' at SNR: ' + str(snr_set) + color.END)

        tb = top_block_cls(ota=False)
        tb.set_file_num_and_scheme(name, snr_set)
        tb.start()
        tb.wait()
```

I randomly get this error:
```
python3: /build/gnuradio-sO0YW3/gnuradio-3.8.2.0-0~gnuradio~bionic/gnuradio-runtime/lib/../include/gnuradio/buffer.h:193: unsigned int gr::buffer::index_add(unsigned int, unsigned int): Assertion `s < d_bufsize' failed.
Aborted (core dumped)
```

The weird thing is that it happens at totally random iterations of the for loop - sometimes in the 1st iteration, sometimes at the 10th, which makes me think that the flowgraph is fine, but there is a GNURadio issue.

Does anyone have any insight into the nature of this error?

Thanks!