Hangs on shutdown after SIGINT

[muesli]

Seems to often sit and wait during shutdown after SIGINT here.

[muesli]

Common output in such a case:

lua: /usr/share/lua/5.2/cqueues.lua:77: interrupted!
stack traceback:
        [C]: in function 'step'
        /usr/share/lua/5.2/cqueues.lua:77: in function 'step'
        ./frivpn_client.lua:453: in function 'handler'
        ./frivpn_client.lua:463: in function 'connect'
        ./frivpn_client.lua:502: in main chunk
        [C]: in ?
shutdown thread 0
wakeup
thread 0 quit
thread 2 quit

[znuh]

Are the thread IDs with successful termination status (%d quit) always the same?

[muesli]

So far, it looks like they are.