I have a weird problem that I've seen for a while and I've just ignored until 
now.  I've seen this with numerous pieces of hardware, but I am currently using 
an E320 in network mode.  This seems to only happen when I am using RFNoC, so I 
assumed it was me, but today I was testing with only stock blocks and have the 
same issue.

The problem is that when I run a GR flowgraph without a GUI in "prompt for 
exit" mode, it doesn't always seem to exit.  I'll hit enter like I am supposed 
to, but it just hangs until I press ctrl-c.  Currently I have an RFNoC:Radio -> 
DmaFIFO -> GR blocks.  I have tested this with different combos of blocks and 
they all seem to have the same issue.  I originally thought it was me or the 
split stream block, but they are both out of the equation now.  Has anyone else 
seen this issue before?

I am running:
[INFO] [UHD] linux; GNU C++ version 4.8.5 20150623 (Red Hat 4.8.5-36); 
Boost_105300; UHD_3.14.1.HEAD-0-g5491b80e

and GR: v3.7.13.4
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