Cleanup

node/conn.go

@@ -5,7 +5,6 @@ import (
 	"log"
 	"net"
 	"net/netip"
-	"runtime/debug"
 	"sync"
 )
 
@@ -21,9 +20,11 @@ func newConnWriter(conn *net.UDPConn) *connWriter {
 }
 
 func (w *connWriter) WriteTo(packet []byte, addr netip.AddrPort) {
+	// Even though a conn is safe for concurrent use, it turns out that a mutex
+	// in Go is more fair when there's contention. Without this lock, control
+	// packets may fail to be sent in a timely manner causing timeouts.
 	w.lock.Lock()
 	if _, err := w.conn.WriteToUDPAddrPort(packet, addr); err != nil {
-		debug.PrintStack()
 		log.Fatalf("Failed to write to UDP port: %v", err)
 	}
 	w.lock.Unlock()