The issue with the hung process is not there on chur (which I'd also like to understand), but the profiler still doesn't produce any output:

gall@chur:~/projects/snabbswitch/src$ sudo ./snabbswitch -jp test.vpws-perf
link report
source.tx->vpn.customer 100,000 packet(s) transmitted
vpn.uplink->sink.rx     100,000 packet(s) transmitted

Must be something silly...