bug: freeze during startup

[nick1udwig]

Describe the bug
You can cause node to freeze by Ctrl+Ving at "wrong time" during boot.
On my system this looks like:

1. Start node on verbosity 2
2. Toggle to 3 during startup
3. Wait for a large message that takes time to scroll out
4. During that large message, toggle to 0
5. Freeze

Note that this occurs on 0.9.4 as well, so I don't think it needs to be addressed in 0.9.5.
In addition, starting runtime at verbosity 3 and then trying to do the above does NOT lead to the hang.
So it seems quite specific.

[dr-frmr]

haven't been able to repro yet