GRC crashes with assertion zero in M&M Clock Recovery block

[Lukas Haase]

Hi,

I am using GRC 3.7.11 on Ubuntu (WSL). When I use the M&M Clock Recovery block 
GRC crashes randomly with this message:


clock_recovery_mm_cc: ii > ninput_items[0] (3168 > 3167
python: 
/build/gnuradio-BBYmSv/gnuradio-3.7.11/gr-digital/lib/clock_recovery_mm_cc_impl.cc:214:
 virtual int gr::digital::clock_recovery_mm_cc_impl::general_work(int, 
gr_vector_int&, gr_vector_const_void_star&, gr_vector_void_star&): Assertion 
`0' failed.

>>> Done (return code -6)


Based on the plots, the block seems to be working (I get the proper bits).

My input signal comes in small bursts (asynchronously at random times which is 
why I need M&M).
First I need to filter the signal and center it on its mean value.
I use the following block for it:

https://paste.pics/4573d1f2cf7df0d5e039874c51127dd9

This shows a screenshot, triggered to one of the bursts:

https://paste.pics/a48ec4aef5ddeeef74e96255d72288b3

The original bits can be seen (blue/red) and the filtered, mean-centered 
version that will go into the M&M block (green/black).

Finally the M&M block looks like this:

https://paste.pics/db179025b5c6e98c3b20e76d56bcf139



The output of the block looks as expected ... until GRC crashes.


Is there anything I am doing wrong?


Thanks,
Luke