Merge branch 'master' into alessio/use-go-testing-t-utils

p2p/pex/pex_reactor.go

@@ -236,6 +236,8 @@ func (r *Reactor) logErrAddrBook(err error) {
 }
 
 // Receive implements Reactor by handling incoming PEX messages.
+// XXX: do not call any methods that can block or incur heavy processing.
+// https://github.com/tendermint/tendermint/issues/2888
 func (r *Reactor) Receive(chID byte, src Peer, msgBytes []byte) {
 	msg, err := decodeMsg(msgBytes)
 	if err != nil {