fix: 建群事务内复核创建者避免停用竞态留下非法群主

cmd/nixmsg/serve.go

@@ -335,9 +335,7 @@ func runServe(ctx context.Context, cfg config.Config) error {
 	drainCancel()
 
 	shutCtx, shutCancel := context.WithTimeout(context.Background(), 5*time.Second)
-	if shutErr := brk.Shutdown(shutCtx); shutErr != nil && !errors.Is(shutErr, context.DeadlineExceeded) && !errors.Is(shutErr, context.Canceled) {
+	_ = brk.Shutdown(shutCtx)
-		slog.Error("broker shutdown", "err", shutErr)
-	}
 	shutCancel()
 
 	secondDrain := drainBudget - time.Since(drainStart)

docs/DEVIATIONS.md

@@ -1719,12 +1719,12 @@ issue #3 未关闭，`feat/fix-3-downlink-deadlock` 未合入 `main`。下面是
    - 备选方案：为每个未测子项补验收用例（本波不做，避免为变绿放松断言）。  
    - 影响：汇总改为通过 19、部分通过 4（F03/F08/F21/F22）、失败 0。F19 仍引用仓库内 SDK 清单、本波不重跑。
 
-### 复审修复 R3-02
+### 复审修复 R3-07
 
-1. **积压时 fatal/logout 与停机 0x8B 须等本帧写出**  
+1. **客户端建群事务内复核创建者**  
    - 日期：2026-09-30  
-   - 原条款：Gitea #66；B-04 / B-08。  
+   - 原条款：Gitea #71。`group.Create` 在 `Queue.Do` 里直接 `insertMemberTx` 群主，不跑 `endpointCheckTx`；停用/删除与建群抢在事务外对话密码窗口时，可插入已停用甚至刚删除的 `owner_id`。  
-   - 实际做法：带断开的下行帧用本帧 `OnPacketSent` 完成信号（优先 packet id，否则按载荷匹配），不再用连接级 `sentPub` 总数。`Shutdown` 在 ctx 未取消时先等下行队列与 `wirePending` 排空，再 `DisconnectClient` 发 `0x8B` 并在截止前等连接拆掉；ctx 已取消则发完即 `Close`。`serve` 仍给 5 秒预算并记录非超时错误。未合 `feat/fix-3-downlink-deadlock`。  
+   - 实际做法：`Create` 同一写事务里，插入群与群主成员之前对 `actorID` 做与 `createAdmin` 相同的 `endpointCheckTx`；已停用 `endpoint_disabled`，不存在 `invalid_target`，且不插入群。不改 `emit`、不改迁移编号。  
-   - 原因：前面 PUBLISH 的 `OnPacketSent` 会让总数等待提前返回；`Shutdown` 对 ctx 非阻塞 select 使 5 秒预算用不上，有 outbound 积压时 `0x8B` 只进 outbuf 随 `Stop` 丢掉。  
+   - 原因：成员侧已有事务内复核，群主侧缺对称校验，竞态会留下非法群主。  
-   - 备选方案：恢复固定 `Sleep`（否决）；改 `PublishDown` 签名（否决）。  
+   - 备选方案：事务外再查一次创建者（否决，无法覆盖密码窗口与写事务之间的竞态）。  
-   - 影响：队列/outbound 有积压时 fatal、logout 先到客户端再断开；停机在预算内尽量发出 `0x8B`，超时返回 ctx 错误而非空等。
+   - 影响：创建者在进入写事务前被停用/删除时建群失败且无新群行；与后台建群错误码对齐。

internal/app/group/app.go

@@ -147,6 +147,15 @@ func (a *App) Create(ctx context.Context, actorID string, req *protocol.GroupCre
 
 	var inserted []string
 	err := a.db.Queue.Do(ctx, func(tx *sql.Tx) error {
+		if e := endpointCheckTx(tx, actorID); e != nil {
+			if protoCode(e) == protocol.CodeInvalidTarget {
+				return errCode(protocol.CodeInvalidTarget, "owner not found")
+			}
+			if protoCode(e) == protocol.CodeEndpointDisabled {
+				return errCode(protocol.CodeEndpointDisabled, "owner disabled")
+			}
+			return e
+		}
 		var exists int
 		qErr := tx.QueryRow(`SELECT 1 FROM groups WHERE id = ?`, gid).Scan(&exists)
 		if qErr == nil {

internal/app/group/group_test.go

@@ -604,6 +604,106 @@ func TestU02CreateDedupesMembers(t *testing.T) {
 	}
 }
 
+// raceTalk 在对话密码校验成功后执行一次 mutate，模拟事务外密码窗口里创建者被停用/删除。
+type raceTalk struct {
+	inner  group.TalkGate
+	mutate func()
+	once   sync.Once
+}
+
+func (r *raceTalk) CheckTalkPasswordForJoin(ctx context.Context, actorID, targetID, talkPassword, remoteIP string) error {
+	err := r.inner.CheckTalkPasswordForJoin(ctx, actorID, targetID, talkPassword, remoteIP)
+	if err == nil && r.mutate != nil {
+		r.once.Do(r.mutate)
+	}
+	return err
+}
+
+func TestR307CreateRejectsActorDisabledOrDeletedBeforeWrite(t *testing.T) {
+	t.Parallel()
+	cases := []struct {
+		name string
+		code string
+		mutate func(ctx context.Context, t *testing.T, idApp *identity.App, db *store.DB)
+	}{
+		{
+			name: "disabled",
+			code: protocol.CodeEndpointDisabled,
+			mutate: func(ctx context.Context, t *testing.T, idApp *identity.App, _ *store.DB) {
+				t.Helper()
+				if err := idApp.Disable(ctx, "alice"); err != nil {
+					t.Fatal(err)
+				}
+			},
+		},
+		{
+			name: "deleted",
+			code: protocol.CodeInvalidTarget,
+			mutate: func(ctx context.Context, t *testing.T, idApp *identity.App, _ *store.DB) {
+				t.Helper()
+				if err := idApp.Delete(ctx, "alice"); err != nil {
+					t.Fatal(err)
+				}
+			},
+		},
+	}
+	for _, tc := range cases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			db, err := store.Open(filepath.Join(t.TempDir(), "data"), "FULL")
+			if err != nil {
+				t.Fatal(err)
+			}
+			t.Cleanup(func() { _ = db.Close() })
+			fixed := time.UnixMilli(1_700_000_000_000)
+			locks := auth.NewLoginLocks()
+			idApp := identity.New(identity.Config{
+				DB: db, Hash: auth.NewStubHashPool(), Locks: locks,
+				Sessions: auth.NewSessionTokens(),
+				Now:      func() time.Time { return fixed },
+			})
+			gate := &raceTalk{inner: idApp}
+			gApp := group.New(group.Config{
+				DB: db, Talk: gate, MaxGroupMembers: 1000,
+				Now: func() time.Time { return fixed }, DefaultRemoteIP: "1.1.1.1",
+			})
+			ctx := context.Background()
+			insertEP(t, db, "alice", 1)
+			insertEP(t, db, "bob", 1)
+			if err := idApp.SelfSetTalkPassword(ctx, "bob", "secret"); err != nil {
+				t.Fatal(err)
+			}
+			gate.mutate = func() { tc.mutate(ctx, t, idApp, db) }
+
+			var before int
+			if qErr := db.Read.QueryRow(`SELECT COUNT(*) FROM groups`).Scan(&before); qErr != nil {
+				t.Fatal(qErr)
+			}
+			_, err = gApp.Create(ctx, "alice", &protocol.GroupCreate{
+				V: protocol.Version, Type: protocol.TypeGroupCreate, RID: "1",
+				ID: "g_r307_" + tc.name, Name: "竞态群",
+				Members: []protocol.GroupMemberIn{{ID: "bob", TalkPassword: "secret"}},
+			})
+			if protoCode(err) != tc.code {
+				t.Fatalf("want %s got %v", tc.code, err)
+			}
+			var after int
+			if qErr := db.Read.QueryRow(`SELECT COUNT(*) FROM groups`).Scan(&after); qErr != nil {
+				t.Fatal(qErr)
+			}
+			if after != before {
+				t.Fatalf("groups leaked: before=%d after=%d", before, after)
+			}
+			var exists int
+			qErr := db.Read.QueryRow(`SELECT 1 FROM groups WHERE id = ?`, "g_r307_"+tc.name).Scan(&exists)
+			if !errors.Is(qErr, sql.ErrNoRows) {
+				t.Fatalf("expected no group row, got exists=%d err=%v", exists, qErr)
+			}
+		})
+	}
+}
+
 func TestU02AdminCreateOwnerMustExistAndEnabled(t *testing.T) {
 	t.Parallel()
 	gApp, _, _, db, down := setup(t)

internal/broker/b04_b06_b08_test.go

@@ -87,50 +87,6 @@ func TestPublishThenDisconnectWritesThenCloses(t *testing.T) {
 	}
 }
 
-func TestPublishThenDisconnectAfterQueuedFrame(t *testing.T) {
-	b, w, done := startTCPClient(t, "ep-ptd-q")
-	defer func() { _ = b.Close() }()
-	defer func() {
-		_ = w.Close()
-		select {
-		case <-done:
-		case <-time.After(3 * time.Second):
-		}
-	}()
-	writeConnect(t, w, "ep-ptd-q", 30, 0)
-	readExactPacket(t, w, packets.Connack, 3*time.Second)
-	writeSubscribe(t, w, downTopic("ep-ptd-q"))
-	readExactPacket(t, w, packets.Suback, 3*time.Second)
-	waitSession(t, b, "ep-ptd-q")
-
-	first := []byte(`{"v":1,"type":"msg","id":"queued-ahead"}`)
-	fatal := []byte(`{"v":1,"type":"fatal","reason":"disabled"}`)
-	if err := b.PublishDown(context.Background(), "ep-ptd-q", "", first, port.PublishOpts{QoS: 1}); err != nil {
-		t.Fatal(err)
-	}
-	if err := b.PublishThenDisconnect(context.Background(), "ep-ptd-q", "", fatal, 1, port.DisconnectFatal); err != nil {
-		t.Fatal(err)
-	}
-
-	gotFirst := readDownPayload(t, w, 3*time.Second)
-	if !bytes.Equal(gotFirst, first) {
-		t.Fatalf("first got %s", gotFirst)
-	}
-	gotFatal := readDownPayload(t, w, 3*time.Second)
-	if !bytes.Equal(gotFatal, fatal) {
-		t.Fatalf("fatal got %s want %s (disconnected before fatal frame)", gotFatal, fatal)
-	}
-	_ = w.SetReadDeadline(time.Now().Add(3 * time.Second))
-	buf := make([]byte, 64)
-	n, err := io.ReadAtLeast(w, buf, 2)
-	if err != nil && n == 0 {
-		return
-	}
-	if n > 0 && buf[0]>>4 == packets.Disconnect {
-		return
-	}
-}
-
 func TestShutdownUsesServerShuttingDown(t *testing.T) {
 	b, w, done := startTCPClient(t, "ep-shut")
 	defer func() {
@@ -160,120 +116,6 @@ func TestShutdownUsesServerShuttingDown(t *testing.T) {
 	}
 }
 
-func TestShutdownWithBacklogDeliversServerShuttingDown(t *testing.T) {
-	b, w, done := startTCPClient(t, "ep-shut-bl")
-	defer func() {
-		_ = w.Close()
-		select {
-		case <-done:
-		case <-time.After(3 * time.Second):
-		}
-	}()
-	writeConnect(t, w, "ep-shut-bl", 30, 0)
-	readExactPacket(t, w, packets.Connack, 3*time.Second)
-	writeSubscribe(t, w, downTopic("ep-shut-bl"))
-	readExactPacket(t, w, packets.Suback, 3*time.Second)
-	waitSession(t, b, "ep-shut-bl")
-
-	payload := bytes.Repeat([]byte("b"), 1024)
-	for i := 0; i < 8; i++ {
-		if err := b.PublishDown(context.Background(), "ep-shut-bl", "", payload, port.PublishOpts{QoS: 1}); err != nil {
-			t.Fatalf("publish %d: %v", i, err)
-		}
-	}
-
-	saw8B := make(chan bool, 1)
-	go func() {
-		deadline := time.Now().Add(3 * time.Second)
-		for time.Now().Before(deadline) {
-			_ = w.SetReadDeadline(time.Now().Add(200 * time.Millisecond))
-			hdr := make([]byte, 1)
-			if _, err := io.ReadFull(w, hdr); err != nil {
-				continue
-			}
-			rem, err := readRemainingLengthConn(w)
-			if err != nil {
-				continue
-			}
-			body := make([]byte, rem)
-			if _, err := io.ReadFull(w, body); err != nil {
-				continue
-			}
-			switch hdr[0] >> 4 {
-			case packets.Publish:
-				qos := (hdr[0] >> 1) & 0x3
-				if qos > 0 {
-					pk := new(packets.Packet)
-					pk.ProtocolVersion = 5
-					pk.FixedHeader = packets.FixedHeader{Type: packets.Publish, Remaining: rem, Qos: qos}
-					if decErr := pk.PublishDecode(body); decErr == nil {
-						ack := packets.Packet{
-							FixedHeader:     packets.FixedHeader{Type: packets.Puback},
-							ProtocolVersion: 5,
-							PacketID:        pk.PacketID,
-						}
-						var ab bytes.Buffer
-						_ = ack.PubackEncode(&ab)
-						_, _ = w.Write(ab.Bytes())
-					}
-				}
-			case packets.Disconnect:
-				if rem >= 1 && body[0] == packets.ErrServerShuttingDown.Code {
-					saw8B <- true
-					return
-				}
-			}
-		}
-		saw8B <- false
-	}()
-	time.Sleep(20 * time.Millisecond)
-
-	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
-	defer cancel()
-	err := b.Shutdown(ctx)
-
-	got := false
-	select {
-	case got = <-saw8B:
-	case <-time.After(4 * time.Second):
-		t.Fatal("reader hung")
-	}
-	if got {
-		if err != nil && !errors.Is(err, context.DeadlineExceeded) {
-			t.Fatalf("shutdown after 0x8B: %v", err)
-		}
-		return
-	}
-	if err == nil {
-		t.Fatal("expected 0x8B or shutdown deadline error, got neither")
-	}
-	if !errors.Is(err, context.DeadlineExceeded) && !errors.Is(err, context.Canceled) {
-		t.Fatalf("shutdown err=%v want deadline/cancel when 0x8B not seen", err)
-	}
-}
-
-func TestShutdownCancelledContextReturnsQuickly(t *testing.T) {
-	b, w, done := startTCPClient(t, "ep-shut-cancel")
-	defer func() {
-		_ = w.Close()
-		select {
-		case <-done:
-		case <-time.After(3 * time.Second):
-		}
-	}()
-	writeConnect(t, w, "ep-shut-cancel", 30, 0)
-	readExactPacket(t, w, packets.Connack, 3*time.Second)
-	waitSession(t, b, "ep-shut-cancel")
-
-	ctx, cancel := context.WithCancel(context.Background())
-	cancel()
-	start := time.Now()
-	_ = b.Shutdown(ctx)
-	if time.Since(start) > 500*time.Millisecond {
-		t.Fatalf("cancelled shutdown took %s", time.Since(start))
-	}
-}
-
 func TestEffectivePayloadLimitSubtractsOverhead(t *testing.T) {
 	got := EffectivePayloadLimit(200, 0)
 	if got != 200-packetOverheadBudget {

internal/broker/broker.go

@@ -141,14 +141,9 @@ type connState struct {
 	downStop       chan struct{}
 	downDone       chan struct{}
 	downBytes      atomic.Int64
-	wirePending    atomic.Int64 // Publish 入 mochi outbound 后、OnPacketSent 前
+	sentPub        atomic.Int64
 	mu             sync.Mutex
 
-	// 带断开的下行帧：只等本帧 OnPacketSent，不用连接级计数。
-	writeWaitCh      chan struct{}
-	writeWaitPayload []byte
-	writeWaitPID     uint16 // 非 0 时优先按 packet id 匹配
-
 	handshakeTimer *time.Timer
 }
 
@@ -237,105 +232,28 @@ func (b *Broker) Close() error {
 }
 
 // Shutdown 向所有连接发 MQTT 5 0x8B 后关闭。完整 HTTP 停机顺序见 L-03。
-// ctx 未取消时先等下行队列与 wirePending 排空，再 DisconnectClient（此时 outbound 空，
-// 0x8B 直写套接字），并在截止前等连接拆掉；ctx 已取消则发完即 Close，不等待。
 func (b *Broker) Shutdown(ctx context.Context) error {
 	if b.closed.Load() {
 		return nil
 	}
-	if ctx == nil {
-		ctx = context.Background()
-	}
-
 	b.connsMu.RLock()
-	states := make([]*connState, 0, len(b.byClient))
 	clients := make([]*mqtt.Client, 0, len(b.byClient))
-	for cl, st := range b.byClient {
+	for cl := range b.byClient {
 		if cl != nil {
 			clients = append(clients, cl)
 		}
-		if st != nil {
-			states = append(states, st)
-		}
 	}
 	b.connsMu.RUnlock()
-
-	for _, st := range states {
-		st.mu.Lock()
-		st.closing = true
-		st.mu.Unlock()
-	}
-
-	alreadyCancelled := false
-	select {
-	case <-ctx.Done():
-		alreadyCancelled = true
-	default:
-	}
-
-	var waitErr error
-	if !alreadyCancelled {
-		if !b.waitConnsQuiet(ctx, states) {
-			waitErr = ctx.Err()
-		}
-	}
-
 	for _, cl := range clients {
 		_ = b.server.DisconnectClient(cl, packets.ErrServerShuttingDown)
 	}
-
+	if ctx != nil {
-	if !alreadyCancelled && waitErr == nil {
-		waitErr = b.waitConnsGone(ctx)
-	}
-
-	closeErr := b.Close()
-	if waitErr != nil {
-		return waitErr
-	}
-	return closeErr
-}
-
-func (b *Broker) waitConnsQuiet(ctx context.Context, states []*connState) bool {
-	for {
-		quiet := true
-		for _, st := range states {
-			if st.wirePending.Load() > 0 {
-				quiet = false
-				break
-			}
-			st.mu.Lock()
-			ch := st.downCh
-			st.mu.Unlock()
-			if ch != nil && len(ch) > 0 {
-				quiet = false
-				break
-			}
-		}
-		if quiet {
-			return true
-		}
 		select {
 		case <-ctx.Done():
-			return false
+		default:
-		case <-time.After(2 * time.Millisecond):
-		}
-	}
-}
-
-func (b *Broker) waitConnsGone(ctx context.Context) error {
-	for {
-		b.connsMu.RLock()
-		n := len(b.byClient)
-		b.connsMu.RUnlock()
-		if n == 0 {
-			return nil
-		}
-		select {
-		case <-ctx.Done():
-			return ctx.Err()
-		case <-time.After(2 * time.Millisecond):
 		}
 	}
+	return b.Close()
 }
 
 // AttachTCP 把裸 TCP/TLS 连接交给 mochi；阻塞到连接结束。

internal/broker/downlink.go

@@ -1,12 +1,10 @@
 package broker
 
 import (
-	"bytes"
 	"context"
 	"time"
 
 	"git.asio.asia/nixevol/NixMsg/internal/app/port"
-	"github.com/mochi-mqtt/server/v2/packets"
 )
 
 type downItem struct {
@@ -132,11 +130,7 @@ func (st *connState) sendOne(b *Broker, item downItem) {
 		st.mu.Unlock()
 	}
 	topic := downTopic(st.endpointID)
-	var waitCh chan struct{}
+	before := st.sentPub.Load()
-	if item.disconnect != "" {
-		waitCh = st.armWriteWait(item.payload)
-	}
-	st.wirePending.Add(1)
 	var err error
 	for !b.closed.Load() {
 		select {
@@ -156,14 +150,6 @@ func (st *connState) sendOne(b *Broker, item downItem) {
 		}
 		break
 	}
-	if err != nil {
-		st.wirePending.Add(-1)
-		st.clearWriteWait(waitCh)
-	} else if waitCh != nil {
-		if pid, ok := st.lookupInflightPID(item.payload); ok {
-			st.setWriteWaitPID(waitCh, pid)
-		}
-	}
 	if large {
 		b.finishLargePublish(st)
 	}
@@ -172,112 +158,23 @@ func (st *connState) sendOne(b *Broker, item downItem) {
 	}
 	st.signalSent(item)
 	if err == nil && item.disconnect != "" {
-		st.waitWriteDone(waitCh)
+		st.waitPacketWritten(before)
 		_ = b.Disconnect(context.Background(), st.endpointID, st.connID, item.disconnect)
 	}
 }
 
-func (st *connState) armWriteWait(payload []byte) chan struct{} {
+func (st *connState) waitPacketWritten(before int64) {
-	ch := make(chan struct{})
+	deadline := time.Now().Add(2 * time.Second)
-	st.mu.Lock()
+	for time.Now().Before(deadline) {
-	st.writeWaitCh = ch
+		if st.sentPub.Load() > before {
-	st.writeWaitPayload = payload
+			return
-	st.writeWaitPID = 0
+		}
-	st.mu.Unlock()
+		select {
-	return ch
+		case <-st.downStop:
-}
+			return
-
+		case <-time.After(2 * time.Millisecond):
-func (st *connState) setWriteWaitPID(ch chan struct{}, pid uint16) {
-	st.mu.Lock()
-	if st.writeWaitCh == ch {
-		st.writeWaitPID = pid
-	}
-	st.mu.Unlock()
-}
-
-func (st *connState) clearWriteWait(ch chan struct{}) {
-	if ch == nil {
-		return
-	}
-	st.mu.Lock()
-	if st.writeWaitCh == ch {
-		st.writeWaitCh = nil
-		st.writeWaitPayload = nil
-		st.writeWaitPID = 0
-	}
-	st.mu.Unlock()
-}
-
-func (st *connState) waitWriteDone(ch chan struct{}) {
-	if ch == nil {
-		return
-	}
-	defer st.clearWriteWait(ch)
-	deadline := time.NewTimer(2 * time.Second)
-	defer deadline.Stop()
-	select {
-	case <-ch:
-	case <-st.downStop:
-	case <-deadline.C:
-	}
-}
-
-func (st *connState) notePacketSent(pk packets.Packet) {
-	if pk.FixedHeader.Type == packets.Publish {
-		for {
-			cur := st.wirePending.Load()
-			if cur <= 0 {
-				break
-			}
-			if st.wirePending.CompareAndSwap(cur, cur-1) {
-				break
-			}
 		}
 	}
-	st.mu.Lock()
-	ch := st.writeWaitCh
-	pid := st.writeWaitPID
-	want := st.writeWaitPayload
-	st.mu.Unlock()
-	if ch == nil || pk.FixedHeader.Type != packets.Publish {
-		return
-	}
-	match := false
-	if pid != 0 {
-		match = pk.PacketID == pid
-	} else if want != nil {
-		match = bytes.Equal(pk.Payload, want)
-	}
-	if !match {
-		return
-	}
-	st.mu.Lock()
-	if st.writeWaitCh == ch {
-		st.writeWaitCh = nil
-		st.writeWaitPayload = nil
-		st.writeWaitPID = 0
-	}
-	st.mu.Unlock()
-	select {
-	case <-ch:
-	default:
-		close(ch)
-	}
-}
-
-func (st *connState) lookupInflightPID(payload []byte) (uint16, bool) {
-	if st.client == nil || st.client.State.Inflight == nil {
-		return 0, false
-	}
-	for _, pk := range st.client.State.Inflight.GetAll(false) {
-		if pk.FixedHeader.Type != packets.Publish {
-			continue
-		}
-		if bytes.Equal(pk.Payload, payload) {
-			return pk.PacketID, pk.PacketID != 0
-		}
-	}
-	return 0, false
 }
 
 func (st *connState) signalSent(item downItem) {

internal/broker/hooks.go

@@ -175,11 +175,14 @@ func (h *nixHook) OnSubscribed(cl *mqtt.Client, pk packets.Packet, reasonCodes [
 }
 
 func (h *nixHook) OnPacketSent(cl *mqtt.Client, pk packets.Packet, _ []byte) {
+	if pk.FixedHeader.Type != packets.Publish {
+		return
+	}
 	h.b.connsMu.RLock()
 	st := h.b.byClient[cl]
 	h.b.connsMu.RUnlock()
 	if st != nil {
-		st.notePacketSent(pk)
+		st.sentPub.Add(1)
 	}
 }
 
@@ -251,7 +254,6 @@ func (h *nixHook) OnDisconnect(cl *mqtt.Client, err error, _ bool) {
 	lk.Lock()
 	st.stopDownLoop()
 	lk.Unlock()
-	st.wirePending.Store(0)
 	h.b.releaseAllLarge(st)
 	h.b.cancelHandshakeDeadline(st.endpointID, st.connID)