possibly fix weird issue I was having with netns, still not sure I understand why it was a problem

src/yggdrasil/debug.go

@@ -236,6 +236,7 @@ func (c *Core) DEBUG_startTunWithMTU(ifname string, iftapmode bool, mtu int) {
 		if err != nil {
 			panic(err)
 		}
+		c.log.Println("Setup TUN/TAP:", c.tun.iface.Name(), straddr)
 		go func() { panic(c.tun.read()) }()
 	}
 	go func() { panic(c.tun.write()) }()

src/yggdrasil/tun_linux.go

@@ -48,7 +48,8 @@ func (tun *tunDevice) setupAddress(addr string) error {
 	}
 	for _, ifce := range ifces {
 		if ifce.Name == tun.iface.Name() {
-			netIF = &ifce
+			var newIF = ifce
+			netIF = &newIF // Don't point inside ifces, it's apparently unsafe?...
 		}
 	}
 	if netIF == nil {