*: fix various data races detected by race detector

etcdserver/auth/auth.go

@@ -22,6 +22,7 @@ import (
 	"reflect"
 	"sort"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/coreos/pkg/capnslog"
@@ -93,7 +94,9 @@ type store struct {
 	server      doer
 	timeout     time.Duration
 	ensuredOnce bool
-	enabled     *bool
+
+	mu      sync.Mutex // protect enabled
+	enabled *bool
 }
 
 type User struct {
@@ -377,13 +380,20 @@ func (s *store) UpdateRole(role Role) (Role, error) {
 }
 
 func (s *store) AuthEnabled() bool {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
 	return s.detectAuth()
 }
 
 func (s *store) EnableAuth() error {
 	if s.AuthEnabled() {
 		return authErr(http.StatusConflict, "already enabled")
 	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
 	_, err := s.GetUser("root")
 	if err != nil {
 		return authErr(http.StatusConflict, "No root user available, please create one")
@@ -412,6 +422,10 @@ func (s *store) DisableAuth() error {
 	if !s.AuthEnabled() {
 		return authErr(http.StatusConflict, "already disabled")
 	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
 	err := s.disableAuth()
 	if err == nil {
 		b := false

etcdserver/cluster.go

@@ -220,6 +220,9 @@ func (c *cluster) SetID(id types.ID) { c.id = id }
 func (c *cluster) SetStore(st store.Store) { c.store = st }
 
 func (c *cluster) Recover() {
+	c.Lock()
+	defer c.Unlock()
+
 	c.members, c.removed = membersFromStore(c.store)
 	c.version = clusterVersionFromStore(c.store)
 	MustDetectDowngrade(c.version)

etcdserver/raft.go

@@ -52,6 +52,11 @@ const (
 )
 
 var (
+	// protect raftStatus
+	// raftStatus might be accessed concurrently 
+	// by integration tests since multiple etcdservers
+	// share the same raftStatus
+	raftStatusMu sync.Mutex
 	// indirection for expvar func interface
 	// expvar panics when publishing duplicate name
 	// expvar does not support remove a registered name
@@ -274,7 +279,9 @@ func startNode(cfg *ServerConfig, cl *cluster, ids []types.ID) (id types.ID, n r
 		MaxInflightMsgs: maxInflightMsgs,
 	}
 	n = raft.StartNode(c, peers)
+	raftStatusMu.Lock()
 	raftStatus = n.Status
+	raftStatusMu.Unlock()
 	advanceTicksForElection(n, c.ElectionTick)
 	return
 }
@@ -304,7 +311,9 @@ func restartNode(cfg *ServerConfig, snapshot *raftpb.Snapshot) (types.ID, *clust
 		MaxInflightMsgs: maxInflightMsgs,
 	}
 	n := raft.RestartNode(c)
+	raftStatusMu.Lock()
 	raftStatus = n.Status
+	raftStatusMu.Unlock()
 	advanceTicksForElection(n, c.ElectionTick)
 	return id, cl, n, s, w
 }

rafthttp/transport.go

@@ -180,7 +180,10 @@ func (t *Transport) Send(msgs []raftpb.Message) {
 		}
 		to := types.ID(m.To)
 
+		t.mu.RLock()
 		p, ok := t.peers[to]
+		t.mu.RUnlock()
+
 		if ok {
 			if m.Type == raftpb.MsgApp {
 				t.ServerStats.SendAppendReq(m.Size())