Jool causes a panic on ICMP tests 12 and 16.
From what I've been able to test, it crashes whenever either node pings the other, and the receiver answers a ICMP error:
n6 --- j --- n4
This bug alone requires us to release a new version ASAP.
Users are advised to use either the latest version of Jool from Github (where the error has already been patched) or fall back to version 3.1.6.
3.2.2 has been uploaded to jool.mx.