Merge pull request #3203 from tendermint/release/v0.29.1

Release/v0.29.1

.circleci/config.yml

@@ -240,7 +240,7 @@ jobs:
             for pkg in $(go list github.com/tendermint/tendermint/... | circleci tests split --split-by=timings); do
               id=$(basename "$pkg")
 
-              GOCACHE=off go test -timeout 5m -race -coverprofile=/tmp/workspace/profiles/$id.out -covermode=atomic "$pkg" | tee "/tmp/logs/$id-$RANDOM.log"
+              GOCACHE=off go test -v -timeout 5m -race -coverprofile=/tmp/workspace/profiles/$id.out -covermode=atomic "$pkg" | tee "/tmp/logs/$id-$RANDOM.log"
             done
       - persist_to_workspace:
           root: /tmp/workspace

CHANGELOG.md

@@ -1,5 +1,28 @@
 # Changelog
 
+## v0.29.1
+
+*January 24, 2019*
+
+Special thanks to external contributors on this release:
+@infinytum, @gauthamzz
+
+This release contains two important fixes: one for p2p layer where we sometimes
+were not closing connections and one for consensus layer where consensus with
+no empty blocks (`create_empty_blocks = false`) could halt.
+
+Friendly reminder, we have a [bug bounty
+program](https://hackerone.com/tendermint).
+
+### IMPROVEMENTS:
+- [pex] [\#3037](https://github.com/tendermint/tendermint/issues/3037) Only log "Reached max attempts to dial" once
+- [rpc] [\#3159](https://github.com/tendermint/tendermint/issues/3159) Expose
+  `triggered_timeout_commit` in the `/dump_consensus_state`
+
+### BUG FIXES:
+- [consensus] [\#3199](https://github.com/tendermint/tendermint/issues/3199) Fix consensus halt with no empty blocks from not resetting triggeredTimeoutCommit
+- [p2p] [\#2967](https://github.com/tendermint/tendermint/issues/2967) Fix file descriptor leak
+
 ## v0.29.0
 
 *January 21, 2019*

consensus/state.go

@@ -94,7 +94,6 @@ type ConsensusState struct {
 	// internal state
 	mtx sync.RWMutex
 	cstypes.RoundState
-	triggeredTimeoutPrecommit bool
 	state                     sm.State // State until height-1.
 
 	// state changes may be triggered by: msgs from peers,
@@ -732,6 +731,7 @@ func (cs *ConsensusState) handleTxsAvailable() {
 	cs.mtx.Lock()
 	defer cs.mtx.Unlock()
 	// we only need to do this for round 0
+	cs.enterNewRound(cs.Height, 0)
 	cs.enterPropose(cs.Height, 0)
 }
 
@@ -782,7 +782,7 @@ func (cs *ConsensusState) enterNewRound(height int64, round int) {
 		cs.ProposalBlockParts = nil
 	}
 	cs.Votes.SetRound(round + 1) // also track next round (round+1) to allow round-skipping
-	cs.triggeredTimeoutPrecommit = false
+	cs.TriggeredTimeoutPrecommit = false
 
 	cs.eventBus.PublishEventNewRound(cs.NewRoundEvent())
 	cs.metrics.Rounds.Set(float64(round))
@@ -1128,12 +1128,12 @@ func (cs *ConsensusState) enterPrecommit(height int64, round int) {
 func (cs *ConsensusState) enterPrecommitWait(height int64, round int) {
 	logger := cs.Logger.With("height", height, "round", round)
 
-	if cs.Height != height || round < cs.Round || (cs.Round == round && cs.triggeredTimeoutPrecommit) {
+	if cs.Height != height || round < cs.Round || (cs.Round == round && cs.TriggeredTimeoutPrecommit) {
 		logger.Debug(
 			fmt.Sprintf(
 				"enterPrecommitWait(%v/%v): Invalid args. "+
-					"Current state is Height/Round: %v/%v/, triggeredTimeoutPrecommit:%v",
+					"Current state is Height/Round: %v/%v/, TriggeredTimeoutPrecommit:%v",
-				height, round, cs.Height, cs.Round, cs.triggeredTimeoutPrecommit))
+				height, round, cs.Height, cs.Round, cs.TriggeredTimeoutPrecommit))
 		return
 	}
 	if !cs.Votes.Precommits(round).HasTwoThirdsAny() {
@@ -1143,7 +1143,7 @@ func (cs *ConsensusState) enterPrecommitWait(height int64, round int) {
 
 	defer func() {
 		// Done enterPrecommitWait:
-		cs.triggeredTimeoutPrecommit = true
+		cs.TriggeredTimeoutPrecommit = true
 		cs.newStep()
 	}()
 

consensus/state_test.go

@@ -1279,6 +1279,71 @@ func TestCommitFromPreviousRound(t *testing.T) {
 	ensureNewRound(newRoundCh, height+1, 0)
 }
 
+type fakeTxNotifier struct {
+	ch chan struct{}
+}
+
+func (n *fakeTxNotifier) TxsAvailable() <-chan struct{} {
+	return n.ch
+}
+
+func (n *fakeTxNotifier) Notify() {
+	n.ch <- struct{}{}
+}
+
+func TestStartNextHeightCorrectly(t *testing.T) {
+	cs1, vss := randConsensusState(4)
+	cs1.config.SkipTimeoutCommit = false
+	cs1.txNotifier = &fakeTxNotifier{ch: make(chan struct{})}
+
+	vs2, vs3, vs4 := vss[1], vss[2], vss[3]
+	height, round := cs1.Height, cs1.Round
+
+	proposalCh := subscribe(cs1.eventBus, types.EventQueryCompleteProposal)
+	timeoutProposeCh := subscribe(cs1.eventBus, types.EventQueryTimeoutPropose)
+
+	newRoundCh := subscribe(cs1.eventBus, types.EventQueryNewRound)
+	newBlockHeader := subscribe(cs1.eventBus, types.EventQueryNewBlockHeader)
+	addr := cs1.privValidator.GetPubKey().Address()
+	voteCh := subscribeToVoter(cs1, addr)
+
+	// start round and wait for propose and prevote
+	startTestRound(cs1, height, round)
+	ensureNewRound(newRoundCh, height, round)
+
+	ensureNewProposal(proposalCh, height, round)
+	rs := cs1.GetRoundState()
+	theBlockHash := rs.ProposalBlock.Hash()
+	theBlockParts := rs.ProposalBlockParts.Header()
+
+	ensurePrevote(voteCh, height, round)
+	validatePrevote(t, cs1, round, vss[0], theBlockHash)
+
+	signAddVotes(cs1, types.PrevoteType, theBlockHash, theBlockParts, vs2, vs3, vs4)
+
+	ensurePrecommit(voteCh, height, round)
+	// the proposed block should now be locked and our precommit added
+	validatePrecommit(t, cs1, round, round, vss[0], theBlockHash, theBlockHash)
+
+	rs = cs1.GetRoundState()
+
+	// add precommits
+	signAddVotes(cs1, types.PrecommitType, nil, types.PartSetHeader{}, vs2)
+	signAddVotes(cs1, types.PrecommitType, theBlockHash, theBlockParts, vs3)
+	signAddVotes(cs1, types.PrecommitType, theBlockHash, theBlockParts, vs4)
+
+	ensureNewBlockHeader(newBlockHeader, height, theBlockHash)
+
+	rs = cs1.GetRoundState()
+	assert.True(t, rs.TriggeredTimeoutPrecommit)
+
+	cs1.txNotifier.(*fakeTxNotifier).Notify()
+
+	ensureNewTimeout(timeoutProposeCh, height+1, round, cs1.config.TimeoutPropose.Nanoseconds())
+	rs = cs1.GetRoundState()
+	assert.False(t, rs.TriggeredTimeoutPrecommit, "triggeredTimeoutPrecommit should be false at the beginning of each round")
+}
+
 //------------------------------------------------------------------------------------------
 // SlashingSuite
 // TODO: Slashing

consensus/types/round_state.go

@@ -84,6 +84,7 @@ type RoundState struct {
 	CommitRound               int                 `json:"commit_round"` //
 	LastCommit                *types.VoteSet      `json:"last_commit"`  // Last precommits at Height-1
 	LastValidators            *types.ValidatorSet `json:"last_validators"`
+	TriggeredTimeoutPrecommit bool                `json:"triggered_timeout_precommit"`
 }
 
 // Compressed version of the RoundState for use in RPC

docs/architecture/adr-033-pubsub.md

@@ -5,6 +5,8 @@ Author: Anton Kaliaev (@melekes)
 ## Changelog
 
 02-10-2018: Initial draft
+16-01-2019: Second version based on our conversation with Jae
+17-01-2019: Third version explaining how new design solves current issues
 
 ## Context
 
@@ -40,7 +42,14 @@ goroutines can be used to avoid uncontrolled memory growth.
 
 In certain cases, this is what you want. But in our case, because we need
 strict ordering of events (if event A was published before B, the guaranteed
-delivery order will be A -> B), we can't use goroutines.
+delivery order will be A -> B), we can't publish msg in a new goroutine every time.
+
+We can also have a goroutine per subscriber, although we'd need to be careful
+with the number of subscribers. It's more difficult to implement as well +
+unclear if we'll benefit from it (cause we'd be forced to create N additional
+channels to distribute msg to these goroutines).
+
+### Non-blocking send
 
 There is also a question whenever we should have a non-blocking send:
 
@@ -56,15 +65,14 @@ for each subscriber {
 ```
 
 This fixes the "slow client problem", but there is no way for a slow client to
-know if it had missed a message. On the other hand, if we're going to stick
+know if it had missed a message. We could return a second channel and close it
-with blocking send, **devs must always ensure subscriber's handling code does not
+to indicate subscription termination. On the other hand, if we're going to
-block**. As you can see, there is an implicit choice between ordering guarantees
+stick with blocking send, **devs must always ensure subscriber's handling code
-and using goroutines.
+does not block**, which is a hard task to put on their shoulders.
 
 The interim option is to run goroutines pool for a single message, wait for all
 goroutines to finish. This will solve "slow client problem", but we'd still
 have to wait `max(goroutine_X_time)` before we can publish the next message.
-My opinion: not worth doing.
 
 ### Channels vs Callbacks
 
@@ -76,8 +84,6 @@ memory leaks and/or memory usage increase.
 
 Go channels are de-facto standard for carrying data between goroutines.
 
-**Question: Is it worth switching to callback functions?**
-
 ### Why `Subscribe()` accepts an `out` channel?
 
 Because in our tests, we create buffered channels (cap: 1). Alternatively, we
@@ -85,27 +91,89 @@ can make capacity an argument.
 
 ## Decision
 
-Change Subscribe() function to return out channel:
+Change Subscribe() function to return a `Subscription` struct:
 
 ```go
-// outCap can be used to set capacity of out channel (unbuffered by default).
+type Subscription struct {
-Subscribe(ctx context.Context, clientID string, query Query, outCap... int) (out <-chan interface{}, err error) {
+  // private fields
+}
+
+func (s *Subscription) Out() <-chan MsgAndTags
+func (s *Subscription) Cancelled() <-chan struct{}
+func (s *Subscription) Err() error
 ```
 
-It's more idiomatic since we're closing it during Unsubscribe/UnsubscribeAll calls.
+Out returns a channel onto which messages and tags are published.
+Unsubscribe/UnsubscribeAll does not close the channel to avoid clients from
+receiving a nil message.
 
-Also, we should make tags available to subscribers:
+Cancelled returns a channel that's closed when the subscription is terminated
+and supposed to be used in a select statement.
+
+If Cancelled is not closed yet, Err() returns nil.
+If Cancelled is closed, Err returns a non-nil error explaining why:
+Unsubscribed if the subscriber choose to unsubscribe,
+OutOfCapacity if the subscriber is not pulling messages fast enough and the Out channel become full.
+After Err returns a non-nil error, successive calls to Err() return the same error.
+
+```go
+subscription, err := pubsub.Subscribe(...)
+if err != nil {
+  // ...
+}
+for {
+select {
+  case msgAndTags <- subscription.Out():
+    // ...
+  case <-subscription.Cancelled():
+    return subscription.Err()
+}
+```
+
+Make Out() channel buffered (cap: 1) by default. In most cases, we want to
+terminate the slow subscriber. Only in rare cases, we want to block the pubsub
+(e.g. when debugging consensus). This should lower the chances of the pubsub
+being frozen.
+
+```go
+// outCap can be used to set capacity of Out channel (1 by default). Set to 0
+for unbuffered channel (WARNING: it may block the pubsub).
+Subscribe(ctx context.Context, clientID string, query Query, outCap... int) (Subscription, error) {
+```
+
+Also, Out() channel should return tags along with a message:
 
 ```go
 type MsgAndTags struct {
     Msg interface{}
     Tags TagMap
 }
-
-// outCap can be used to set capacity of out channel (unbuffered by default).
-Subscribe(ctx context.Context, clientID string, query Query, outCap... int) (out <-chan MsgAndTags, err error) {
 ```
 
+to inform clients of which Tags were used with Msg.
+
+### How this new design solves the current issues?
+
+https://github.com/tendermint/tendermint/issues/951 (https://github.com/tendermint/tendermint/issues/1880)
+
+Because of non-blocking send, situation where we'll deadlock is not possible
+anymore. If the client stops reading messages, it will be removed.
+
+https://github.com/tendermint/tendermint/issues/1879
+
+MsgAndTags is used now instead of a plain message.
+
+### Future problems and their possible solutions
+
+https://github.com/tendermint/tendermint/issues/2826
+
+One question I am still pondering about: how to prevent pubsub from slowing
+down consensus. We can increase the pubsub queue size (which is 0 now). Also,
+it's probably a good idea to limit the total number of subscribers.
+
+This can be made automatically. Say we set queue size to 1000 and, when it's >=
+80% full, refuse new subscriptions.
+
 ## Status
 
 In review
@@ -116,7 +184,10 @@ In review
 
 - more idiomatic interface
 - subscribers know what tags msg was published with
+- subscribers aware of the reason their subscription was cancelled
 
 ### Negative
 
+- (since v1) no concurrency when it comes to publishing messages
+
 ### Neutral

docs/networks/docker-compose.md

@@ -78,6 +78,78 @@ cd $GOPATH/src/github.com/tendermint/tendermint
 rm -rf ./build/node*
 ```
 
+## Configuring abci containers 
+
+To use your own abci applications with 4-node setup edit the [docker-compose.yaml](https://github.com/tendermint/tendermint/blob/develop/docker-compose.yml) file and add image to your abci application.
+
+```
+ abci0:
+    container_name: abci0
+    image: "abci-image"
+    build:
+      context: .
+      dockerfile: abci.Dockerfile
+    command: <insert command to run your abci application>
+    networks:
+      localnet:
+        ipv4_address: 192.167.10.6
+
+  abci1:
+    container_name: abci1
+    image: "abci-image"
+    build:
+      context: .
+      dockerfile: abci.Dockerfile
+    command: <insert command to run your abci application>
+    networks:
+      localnet:
+        ipv4_address: 192.167.10.7
+
+  abci2:
+    container_name: abci2
+    image: "abci-image"
+    build:
+      context: .
+      dockerfile: abci.Dockerfile
+    command: <insert command to run your abci application>
+    networks:
+      localnet:
+        ipv4_address: 192.167.10.8
+
+  abci3:
+    container_name: abci3
+    image: "abci-image"
+    build:
+      context: .
+      dockerfile: abci.Dockerfile
+    command: <insert command to run your abci application>
+    networks:
+      localnet:
+        ipv4_address: 192.167.10.9
+
+```
+
+Override the [command](https://github.com/tendermint/tendermint/blob/master/networks/local/localnode/Dockerfile#L12) in each node to connect to it's abci. 
+
+```
+  node0:
+    container_name: node0
+    image: "tendermint/localnode"
+    ports:
+      - "26656-26657:26656-26657"
+    environment:
+      - ID=0
+      - LOG=$${LOG:-tendermint.log}
+    volumes:
+      - ./build:/tendermint:Z
+    command: node --proxy_app=tcp://abci0:26658
+    networks:
+      localnet:
+        ipv4_address: 192.167.10.2
+```
+
+Similarly do for node1, node2 and node3 then [run testnet](https://github.com/tendermint/tendermint/blob/master/docs/networks/docker-compose.md#run-a-testnet)
+
 ## Logging
 
 Log is saved under the attached volume, in the `tendermint.log` file. If the

lite/doc.go

@@ -15,9 +15,7 @@ for you, so you can just build nice applications.
 We design for clients who have no strong trust relationship with any Tendermint
 node, just the blockchain and validator set as a whole.
 
-# Data structures
+SignedHeader
-
-## SignedHeader
 
 SignedHeader is a block header along with a commit -- enough validator
 precommit-vote signatures to prove its validity (> 2/3 of the voting power)
@@ -42,7 +40,7 @@ The FullCommit is also declared in this package as a convenience structure,
 which includes the SignedHeader along with the full current and next
 ValidatorSets.
 
-## Verifier
+Verifier
 
 A Verifier validates a new SignedHeader given the currently known state. There
 are two different types of Verifiers provided.
@@ -56,11 +54,10 @@ greater).
 DynamicVerifier - this Verifier implements an auto-update and persistence
 strategy to verify any SignedHeader of the blockchain.
 
-## Provider and PersistentProvider
+Provider and PersistentProvider
 
 A Provider allows us to store and retrieve the FullCommits.
 
-```go
     type Provider interface {
         // LatestFullCommit returns the latest commit with
         // minHeight <= height <= maxHeight.
@@ -68,23 +65,21 @@ type Provider interface {
         // minHeight <= height.
         LatestFullCommit(chainID string, minHeight, maxHeight int64) (FullCommit, error)
     }
-```
 
 * client.NewHTTPProvider - query Tendermint rpc.
 
 A PersistentProvider is a Provider that also allows for saving state.  This is
 used by the DynamicVerifier for persistence.
 
-```go
     type PersistentProvider interface {
         Provider
 
         // SaveFullCommit saves a FullCommit (without verification).
         SaveFullCommit(fc FullCommit) error
     }
-```
 
 * DBProvider - persistence provider for use with any libs/DB.
+
 * MultiProvider - combine multiple providers.
 
 The suggested use for local light clients is client.NewHTTPProvider(...) for
@@ -93,7 +88,7 @@ dbm.NewMemDB()), NewDBProvider("label", db.NewFileDB(...))) to store confirmed
 full commits (Trusted)
 
 
-# How We Track Validators
+How We Track Validators
 
 Unless you want to blindly trust the node you talk with, you need to trace
 every response back to a hash in a block header and validate the commit

p2p/conn_set.go

@@ -11,6 +11,7 @@ type ConnSet interface {
 	HasIP(net.IP) bool
 	Set(net.Conn, []net.IP)
 	Remove(net.Conn)
+	RemoveAddr(net.Addr)
 }
 
 type connSetItem struct {
@@ -62,6 +63,13 @@ func (cs *connSet) Remove(c net.Conn) {
 	delete(cs.conns, c.RemoteAddr().String())
 }
 
+func (cs *connSet) RemoveAddr(addr net.Addr) {
+	cs.Lock()
+	defer cs.Unlock()
+
+	delete(cs.conns, addr.String())
+}
+
 func (cs *connSet) Set(c net.Conn, ips []net.IP) {
 	cs.Lock()
 	defer cs.Unlock()

p2p/dummy/peer.go

@@ -55,6 +55,16 @@ func (p *peer) RemoteIP() net.IP {
 	return net.ParseIP("127.0.0.1")
 }
 
+// Addr always returns tcp://localhost:8800.
+func (p *peer) RemoteAddr() net.Addr {
+	return &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 8800}
+}
+
+// CloseConn always returns nil.
+func (p *peer) CloseConn() error {
+	return nil
+}
+
 // Status always returns empry connection status.
 func (p *peer) Status() tmconn.ConnectionStatus {
 	return tmconn.ConnectionStatus{}

p2p/peer.go

@@ -20,13 +20,16 @@ type Peer interface {
 
 	ID() ID               // peer's cryptographic ID
 	RemoteIP() net.IP     // remote IP of the connection
+	RemoteAddr() net.Addr // remote address of the connection
 
 	IsOutbound() bool   // did we dial the peer
 	IsPersistent() bool // do we redial this peer when we disconnect
 
+	CloseConn() error // close original connection
+
 	NodeInfo() NodeInfo // peer's info
 	Status() tmconn.ConnectionStatus
-	OriginalAddr() *NetAddress
+	OriginalAddr() *NetAddress // original address for outbound peers
 
 	Send(byte, []byte) bool
 	TrySend(byte, []byte) bool
@@ -296,6 +299,11 @@ func (p *peer) hasChannel(chID byte) bool {
 	return false
 }
 
+// CloseConn closes original connection. Used for cleaning up in cases where the peer had not been started at all.
+func (p *peer) CloseConn() error {
+	return p.peerConn.conn.Close()
+}
+
 //---------------------------------------------------
 // methods only used for testing
 // TODO: can we remove these?
@@ -305,8 +313,8 @@ func (pc *peerConn) CloseConn() {
 	pc.conn.Close() // nolint: errcheck
 }
 
-// Addr returns peer's remote network address.
+// RemoteAddr returns peer's remote network address.
-func (p *peer) Addr() net.Addr {
+func (p *peer) RemoteAddr() net.Addr {
 	return p.peerConn.conn.RemoteAddr()
 }
 

p2p/peer_set_test.go

@@ -30,6 +30,8 @@ func (mp *mockPeer) Get(s string) interface{}                { return s }
 func (mp *mockPeer) Set(string, interface{})                 {}
 func (mp *mockPeer) RemoteIP() net.IP                        { return mp.ip }
 func (mp *mockPeer) OriginalAddr() *NetAddress               { return nil }
+func (mp *mockPeer) RemoteAddr() net.Addr                    { return &net.TCPAddr{IP: mp.ip, Port: 8800} }
+func (mp *mockPeer) CloseConn() error                        { return nil }
 
 // Returns a mock peer
 func newMockPeer(ip net.IP) *mockPeer {

p2p/peer_test.go

@@ -39,7 +39,7 @@ func TestPeerBasic(t *testing.T) {
 	assert.False(p.IsPersistent())
 	p.persistent = true
 	assert.True(p.IsPersistent())
-	assert.Equal(rp.Addr().DialString(), p.Addr().String())
+	assert.Equal(rp.Addr().DialString(), p.RemoteAddr().String())
 	assert.Equal(rp.ID(), p.ID())
 }
 
@@ -137,9 +137,9 @@ type remotePeer struct {
 	PrivKey    crypto.PrivKey
 	Config     *config.P2PConfig
 	addr       *NetAddress
-	quit       chan struct{}
 	channels   cmn.HexBytes
 	listenAddr string
+	listener   net.Listener
 }
 
 func (rp *remotePeer) Addr() *NetAddress {
@@ -159,25 +159,45 @@ func (rp *remotePeer) Start() {
 	if e != nil {
 		golog.Fatalf("net.Listen tcp :0: %+v", e)
 	}
+	rp.listener = l
 	rp.addr = NewNetAddress(PubKeyToID(rp.PrivKey.PubKey()), l.Addr())
-	rp.quit = make(chan struct{})
 	if rp.channels == nil {
 		rp.channels = []byte{testCh}
 	}
-	go rp.accept(l)
+	go rp.accept()
 }
 
 func (rp *remotePeer) Stop() {
-	close(rp.quit)
+	rp.listener.Close()
 }
 
-func (rp *remotePeer) accept(l net.Listener) {
+func (rp *remotePeer) Dial(addr *NetAddress) (net.Conn, error) {
+	conn, err := addr.DialTimeout(1 * time.Second)
+	if err != nil {
+		return nil, err
+	}
+	pc, err := testInboundPeerConn(conn, rp.Config, rp.PrivKey)
+	if err != nil {
+		return nil, err
+	}
+	_, err = handshake(pc.conn, time.Second, rp.nodeInfo())
+	if err != nil {
+		return nil, err
+	}
+	return conn, err
+}
+
+func (rp *remotePeer) accept() {
 	conns := []net.Conn{}
 
 	for {
-		conn, err := l.Accept()
+		conn, err := rp.listener.Accept()
 		if err != nil {
-			golog.Fatalf("Failed to accept conn: %+v", err)
+			golog.Printf("Failed to accept conn: %+v", err)
+			for _, conn := range conns {
+				_ = conn.Close()
+			}
+			return
 		}
 
 		pc, err := testInboundPeerConn(conn, rp.Config, rp.PrivKey)
@@ -185,31 +205,20 @@ func (rp *remotePeer) accept(l net.Listener) {
 			golog.Fatalf("Failed to create a peer: %+v", err)
 		}
 
-		_, err = handshake(pc.conn, time.Second, rp.nodeInfo(l))
+		_, err = handshake(pc.conn, time.Second, rp.nodeInfo())
 		if err != nil {
 			golog.Fatalf("Failed to perform handshake: %+v", err)
 		}
 
 		conns = append(conns, conn)
-
-		select {
-		case <-rp.quit:
-			for _, conn := range conns {
-				if err := conn.Close(); err != nil {
-					golog.Fatal(err)
-				}
-			}
-			return
-		default:
-		}
 	}
 }
 
-func (rp *remotePeer) nodeInfo(l net.Listener) NodeInfo {
+func (rp *remotePeer) nodeInfo() NodeInfo {
 	return DefaultNodeInfo{
 		ProtocolVersion: defaultProtocolVersion,
 		ID_:             rp.Addr().ID,
-		ListenAddr:      l.Addr().String(),
+		ListenAddr:      rp.listener.Addr().String(),
 		Network:         "testing",
 		Version:         "1.2.3-rc0-deadbeef",
 		Channels:        rp.channels,

p2p/pex/pex_reactor.go

@@ -471,7 +471,11 @@ func (r *PEXReactor) dialPeer(addr *p2p.NetAddress) {
 	attempts, lastDialed := r.dialAttemptsInfo(addr)
 
 	if attempts > maxAttemptsToDial {
-		r.Logger.Error("Reached max attempts to dial", "addr", addr, "attempts", attempts)
+		// Do not log the message if the addr gets readded.
+		if attempts+1 == maxAttemptsToDial {
+			r.Logger.Info("Reached max attempts to dial", "addr", addr, "attempts", attempts)
+			r.attemptsToDial.Store(addr.DialString(), _attemptsToDial{attempts + 1, time.Now()})
+		}
 		r.book.MarkBad(addr)
 		return
 	}

p2p/pex/pex_reactor_test.go

@@ -404,6 +404,8 @@ func (mockPeer) TrySend(byte, []byte) bool     { return false }
 func (mockPeer) Set(string, interface{})       {}
 func (mockPeer) Get(string) interface{}        { return nil }
 func (mockPeer) OriginalAddr() *p2p.NetAddress { return nil }
+func (mockPeer) RemoteAddr() net.Addr          { return &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 8800} }
+func (mockPeer) CloseConn() error              { return nil }
 
 func assertPeersWithTimeout(
 	t *testing.T,

p2p/switch.go

@@ -210,6 +210,7 @@ func (sw *Switch) OnStart() error {
 func (sw *Switch) OnStop() {
 	// Stop peers
 	for _, p := range sw.peers.List() {
+		sw.transport.Cleanup(p)
 		p.Stop()
 		if sw.peers.Remove(p) {
 			sw.metrics.Peers.Add(float64(-1))
@@ -304,6 +305,7 @@ func (sw *Switch) stopAndRemovePeer(peer Peer, reason interface{}) {
 	if sw.peers.Remove(peer) {
 		sw.metrics.Peers.Add(float64(-1))
 	}
+	sw.transport.Cleanup(peer)
 	peer.Stop()
 	for _, reactor := range sw.reactors {
 		reactor.RemovePeer(peer, reason)
@@ -529,13 +531,16 @@ func (sw *Switch) acceptRoutine() {
 				"max", sw.config.MaxNumInboundPeers,
 			)
 
-			_ = p.Stop()
+			sw.transport.Cleanup(p)
 
 			continue
 		}
 
 		if err := sw.addPeer(p); err != nil {
+			sw.transport.Cleanup(p)
+			if p.IsRunning() {
 				_ = p.Stop()
+			}
 			sw.Logger.Info(
 				"Ignoring inbound connection: error while adding peer",
 				"err", err,
@@ -593,7 +598,10 @@ func (sw *Switch) addOutboundPeerWithConfig(
 	}
 
 	if err := sw.addPeer(p); err != nil {
+		sw.transport.Cleanup(p)
+		if p.IsRunning() {
 			_ = p.Stop()
+		}
 		return err
 	}
 
@@ -628,7 +636,8 @@ func (sw *Switch) filterPeer(p Peer) error {
 	return nil
 }
 
-// addPeer starts up the Peer and adds it to the Switch.
+// addPeer starts up the Peer and adds it to the Switch. Error is returned if
+// the peer is filtered out or failed to start or can't be added.
 func (sw *Switch) addPeer(p Peer) error {
 	if err := sw.filterPeer(p); err != nil {
 		return err
@@ -636,11 +645,15 @@ func (sw *Switch) addPeer(p Peer) error {
 
 	p.SetLogger(sw.Logger.With("peer", p.NodeInfo().NetAddress()))
 
-	// All good. Start peer
+	// Handle the shut down case where the switch has stopped but we're
+	// concurrently trying to add a peer.
 	if sw.IsRunning() {
+		// All good. Start peer
 		if err := sw.startInitPeer(p); err != nil {
 			return err
 		}
+	} else {
+		sw.Logger.Error("Won't start a peer - switch is not running", "peer", p)
 	}
 
 	// Add the peer to .peers.

p2p/switch_test.go

@@ -3,7 +3,9 @@ package p2p
 import (
 	"bytes"
 	"fmt"
+	"io"
 	"io/ioutil"
+	"net"
 	"net/http"
 	"net/http/httptest"
 	"regexp"
@@ -13,7 +15,6 @@ import (
 	"time"
 
 	stdprometheus "github.com/prometheus/client_golang/prometheus"
-
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
@@ -477,6 +478,58 @@ func TestSwitchFullConnectivity(t *testing.T) {
 	}
 }
 
+func TestSwitchAcceptRoutine(t *testing.T) {
+	cfg.MaxNumInboundPeers = 5
+
+	// make switch
+	sw := MakeSwitch(cfg, 1, "testing", "123.123.123", initSwitchFunc)
+	err := sw.Start()
+	require.NoError(t, err)
+	defer sw.Stop()
+
+	remotePeers := make([]*remotePeer, 0)
+	assert.Equal(t, 0, sw.Peers().Size())
+
+	// 1. check we connect up to MaxNumInboundPeers
+	for i := 0; i < cfg.MaxNumInboundPeers; i++ {
+		rp := &remotePeer{PrivKey: ed25519.GenPrivKey(), Config: cfg}
+		remotePeers = append(remotePeers, rp)
+		rp.Start()
+		c, err := rp.Dial(sw.NodeInfo().NetAddress())
+		require.NoError(t, err)
+		// spawn a reading routine to prevent connection from closing
+		go func(c net.Conn) {
+			for {
+				one := make([]byte, 1)
+				_, err := c.Read(one)
+				if err != nil {
+					return
+				}
+			}
+		}(c)
+	}
+	time.Sleep(10 * time.Millisecond)
+	assert.Equal(t, cfg.MaxNumInboundPeers, sw.Peers().Size())
+
+	// 2. check we close new connections if we already have MaxNumInboundPeers peers
+	rp := &remotePeer{PrivKey: ed25519.GenPrivKey(), Config: cfg}
+	rp.Start()
+	conn, err := rp.Dial(sw.NodeInfo().NetAddress())
+	require.NoError(t, err)
+	// check conn is closed
+	one := make([]byte, 1)
+	conn.SetReadDeadline(time.Now().Add(10 * time.Millisecond))
+	_, err = conn.Read(one)
+	assert.Equal(t, io.EOF, err)
+	assert.Equal(t, cfg.MaxNumInboundPeers, sw.Peers().Size())
+	rp.Stop()
+
+	// stop remote peers
+	for _, rp := range remotePeers {
+		rp.Stop()
+	}
+}
+
 func BenchmarkSwitchBroadcast(b *testing.B) {
 	s1, s2 := MakeSwitchPair(b, func(i int, sw *Switch) *Switch {
 		// Make bar reactors of bar channels each

p2p/test_util.go

@@ -247,17 +247,35 @@ func testNodeInfo(id ID, name string) NodeInfo {
 }
 
 func testNodeInfoWithNetwork(id ID, name, network string) NodeInfo {
+	port, err := getFreePort()
+	if err != nil {
+		panic(err)
+	}
 	return DefaultNodeInfo{
 		ProtocolVersion: defaultProtocolVersion,
 		ID_:             id,
-		ListenAddr:      fmt.Sprintf("127.0.0.1:%d", cmn.RandIntn(64512)+1023),
+		ListenAddr:      fmt.Sprintf("127.0.0.1:%d", port),
 		Network:         network,
 		Version:         "1.2.3-rc0-deadbeef",
 		Channels:        []byte{testCh},
 		Moniker:         name,
 		Other: DefaultNodeInfoOther{
 			TxIndex:    "on",
-			RPCAddress: fmt.Sprintf("127.0.0.1:%d", cmn.RandIntn(64512)+1023),
+			RPCAddress: fmt.Sprintf("127.0.0.1:%d", port),
 		},
 	}
 }
+
+func getFreePort() (int, error) {
+	addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
+	if err != nil {
+		return 0, err
+	}
+
+	l, err := net.ListenTCP("tcp", addr)
+	if err != nil {
+		return 0, err
+	}
+	defer l.Close()
+	return l.Addr().(*net.TCPAddr).Port, nil
+}

p2p/transport.go

@@ -52,6 +52,9 @@ type Transport interface {
 
 	// Dial connects to the Peer for the address.
 	Dial(NetAddress, peerConfig) (Peer, error)
+
+	// Cleanup any resources associated with Peer.
+	Cleanup(Peer)
 }
 
 // transportLifecycle bundles the methods for callers to control start and stop
@@ -274,6 +277,13 @@ func (mt *MultiplexTransport) acceptPeers() {
 	}
 }
 
+// Cleanup removes the given address from the connections set and
+// closes the connection.
+func (mt *MultiplexTransport) Cleanup(peer Peer) {
+	mt.conns.RemoveAddr(peer.RemoteAddr())
+	_ = peer.CloseConn()
+}
+
 func (mt *MultiplexTransport) cleanup(c net.Conn) error {
 	mt.conns.Remove(c)
 
@@ -418,12 +428,6 @@ func (mt *MultiplexTransport) wrapPeer(
 		PeerMetrics(cfg.metrics),
 	)
 
-	// Wait for Peer to Stop so we can cleanup.
-	go func(c net.Conn) {
-		<-p.Quit()
-		_ = mt.cleanup(c)
-	}(c)
-
 	return p
 }
 

version/version.go

@@ -18,7 +18,7 @@ const (
 	// TMCoreSemVer is the current version of Tendermint Core.
 	// It's the Semantic Version of the software.
 	// Must be a string because scripts like dist.sh read this file.
-	TMCoreSemVer = "0.29.0"
+	TMCoreSemVer = "0.29.1"
 
 	// ABCISemVer is the semantic version of the ABCI library
 	ABCISemVer  = "0.15.0"