Bump version

The cache deduplication in Client.Exchange uses a channel-based lock
per DNS question. Waiting goroutines blocked on <-cond without context
awareness, causing them to accumulate indefinitely when the owning
goroutine's transport call stalls. Add select on ctx.Done() so waiters
respect context cancellation and timeouts.

dns/client.go

@@ -144,7 +144,11 @@ func (c *Client) Exchange(ctx context.Context, transport adapter.DNSTransport, m
 		if c.cache != nil {
 			cond, loaded := c.cacheLock.LoadOrStore(question, make(chan struct{}))
 			if loaded {
-				<-cond
+				select {
+				case <-cond:
+				case <-ctx.Done():
+					return nil, ctx.Err()
+				}
 			} else {
 				defer func() {
 					c.cacheLock.Delete(question)
@@ -154,7 +158,11 @@ func (c *Client) Exchange(ctx context.Context, transport adapter.DNSTransport, m
 		} else if c.transportCache != nil {
 			cond, loaded := c.transportCacheLock.LoadOrStore(question, make(chan struct{}))
 			if loaded {
-				<-cond
+				select {
+				case <-cond:
+				case <-ctx.Done():
+					return nil, ctx.Err()
+				}
 			} else {
 				defer func() {
 					c.transportCacheLock.Delete(question)

dns/router.go

@@ -378,9 +378,11 @@ func (r *Router) Lookup(ctx context.Context, domain string, options adapter.DNSQ
 				case *R.RuleActionReject:
 					return nil, &R.RejectedError{Cause: action.Error(ctx)}
 				case *R.RuleActionPredefined:
+					responseAddrs = nil
 					if action.Rcode != mDNS.RcodeSuccess {
 						err = RcodeError(action.Rcode)
 					} else {
+						err = nil
 						for _, answer := range action.Answer {
 							switch record := answer.(type) {
 							case *mDNS.A:

docs/changelog.md

@@ -2,6 +2,14 @@
 icon: material/alert-decagram
 ---
 
+#### 1.12.22
+
+* Fixes and improvements
+
+#### 1.12.21
+
+* Fixes and improvements
+
 #### 1.12.20
 
 * Fixes and improvements

go.mod

@@ -29,7 +29,7 @@ require (
 	github.com/sagernet/quic-go v0.52.0-sing-box-mod.3
 	github.com/sagernet/sing v0.7.18
 	github.com/sagernet/sing-mux v0.3.4
-	github.com/sagernet/sing-quic v0.5.2
+	github.com/sagernet/sing-quic v0.5.3
 	github.com/sagernet/sing-shadowsocks v0.2.8
 	github.com/sagernet/sing-shadowsocks2 v0.2.1
 	github.com/sagernet/sing-shadowtls v0.2.1-0.20250503051639-fcd445d33c11

go.sum

@@ -169,8 +169,8 @@ github.com/sagernet/sing v0.7.18 h1:iZHkaru1/MoHugx3G+9S3WG4owMewKO/KvieE2Pzk4E=
 github.com/sagernet/sing v0.7.18/go.mod h1:ARkL0gM13/Iv5VCZmci/NuoOlePoIsW0m7BWfln/Hak=
 github.com/sagernet/sing-mux v0.3.4 h1:ZQplKl8MNXutjzbMVtWvWG31fohhgOfCuUZR4dVQ8+s=
 github.com/sagernet/sing-mux v0.3.4/go.mod h1:QvlKMyNBNrQoyX4x+gq028uPbLM2XeRpWtDsWBJbFSk=
-github.com/sagernet/sing-quic v0.5.2 h1:I3vlfRImhr0uLwRS3b3ib70RMG9FcXtOKKUDz3eKRWc=
-github.com/sagernet/sing-quic v0.5.2/go.mod h1:evP1e++ZG8TJHVV5HudXV4vWeYzGfCdF4HwSJZcdqkI=
+github.com/sagernet/sing-quic v0.5.3 h1:K937DKJN98xqyztijRkLJqbBfyV4rEZcYxFyP3EBikU=
+github.com/sagernet/sing-quic v0.5.3/go.mod h1:evP1e++ZG8TJHVV5HudXV4vWeYzGfCdF4HwSJZcdqkI=
 github.com/sagernet/sing-shadowsocks v0.2.8 h1:PURj5PRoAkqeHh2ZW205RWzN9E9RtKCVCzByXruQWfE=
 github.com/sagernet/sing-shadowsocks v0.2.8/go.mod h1:lo7TWEMDcN5/h5B8S0ew+r78ZODn6SwVaFhvB6H+PTI=
 github.com/sagernet/sing-shadowsocks2 v0.2.1 h1:dWV9OXCeFPuYGHb6IRqlSptVnSzOelnqqs2gQ2/Qioo=

protocol/naive/inbound_conn.go

@@ -95,6 +95,7 @@ func (p *paddingConn) writeWithPadding(writer io.Writer, data []byte) (n int, er
 		binary.BigEndian.PutUint16(header, uint16(len(data)))
 		header[2] = byte(paddingSize)
 		common.Must1(buffer.Write(data))
+		buffer.Extend(paddingSize)
 		_, err = writer.Write(buffer.Bytes())
 		if err == nil {
 			n = len(data)

route/rule/rule_abstract.go

@@ -107,9 +107,7 @@ func (r *abstractDefaultRule) Match(metadata *adapter.InboundContext) bool {
 	}
 
 	for _, item := range r.items {
-		if _, isRuleSet := item.(*RuleSetItem); !isRuleSet {
-			metadata.DidMatch = true
-		}
+		metadata.DidMatch = true
 		if !item.Match(metadata) {
 			return r.invert
 		}

route/rule/rule_abstract_test.go

@@ -0,0 +1,157 @@
+package rule
+
+import (
+	"context"
+	"testing"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing/common/x/list"
+
+	"github.com/stretchr/testify/require"
+	"go4.org/netipx"
+)
+
+type fakeRuleSet struct {
+	matched bool
+}
+
+func (f *fakeRuleSet) Name() string {
+	return "fake-rule-set"
+}
+
+func (f *fakeRuleSet) StartContext(context.Context, *adapter.HTTPStartContext) error {
+	return nil
+}
+
+func (f *fakeRuleSet) PostStart() error {
+	return nil
+}
+
+func (f *fakeRuleSet) Metadata() adapter.RuleSetMetadata {
+	return adapter.RuleSetMetadata{}
+}
+
+func (f *fakeRuleSet) ExtractIPSet() []*netipx.IPSet {
+	return nil
+}
+
+func (f *fakeRuleSet) IncRef() {}
+
+func (f *fakeRuleSet) DecRef() {}
+
+func (f *fakeRuleSet) Cleanup() {}
+
+func (f *fakeRuleSet) RegisterCallback(adapter.RuleSetUpdateCallback) *list.Element[adapter.RuleSetUpdateCallback] {
+	return nil
+}
+
+func (f *fakeRuleSet) UnregisterCallback(*list.Element[adapter.RuleSetUpdateCallback]) {}
+
+func (f *fakeRuleSet) Close() error {
+	return nil
+}
+
+func (f *fakeRuleSet) Match(*adapter.InboundContext) bool {
+	return f.matched
+}
+
+func (f *fakeRuleSet) String() string {
+	return "fake-rule-set"
+}
+
+type fakeRuleItem struct {
+	matched bool
+}
+
+func (f *fakeRuleItem) Match(*adapter.InboundContext) bool {
+	return f.matched
+}
+
+func (f *fakeRuleItem) String() string {
+	return "fake-rule-item"
+}
+
+func newRuleSetOnlyRule(ruleSetMatched bool, invert bool) *DefaultRule {
+	ruleSetItem := &RuleSetItem{
+		setList: []adapter.RuleSet{&fakeRuleSet{matched: ruleSetMatched}},
+	}
+	return &DefaultRule{
+		abstractDefaultRule: abstractDefaultRule{
+			items:    []RuleItem{ruleSetItem},
+			allItems: []RuleItem{ruleSetItem},
+			invert:   invert,
+		},
+	}
+}
+
+func newSingleItemRule(matched bool) *DefaultRule {
+	item := &fakeRuleItem{matched: matched}
+	return &DefaultRule{
+		abstractDefaultRule: abstractDefaultRule{
+			items:    []RuleItem{item},
+			allItems: []RuleItem{item},
+		},
+	}
+}
+
+func TestAbstractDefaultRule_RuleSetOnly_InvertFalse(t *testing.T) {
+	t.Parallel()
+	require.True(t, newRuleSetOnlyRule(true, false).Match(&adapter.InboundContext{}))
+	require.False(t, newRuleSetOnlyRule(false, false).Match(&adapter.InboundContext{}))
+}
+
+func TestAbstractDefaultRule_RuleSetOnly_InvertTrue(t *testing.T) {
+	t.Parallel()
+	require.False(t, newRuleSetOnlyRule(true, true).Match(&adapter.InboundContext{}))
+	require.True(t, newRuleSetOnlyRule(false, true).Match(&adapter.InboundContext{}))
+}
+
+func TestAbstractLogicalRule_And_WithRuleSetInvert(t *testing.T) {
+	t.Parallel()
+	testCases := []struct {
+		name          string
+		aMatched      bool
+		ruleSetBMatch bool
+		expected      bool
+	}{
+		{
+			name:          "A true B true",
+			aMatched:      true,
+			ruleSetBMatch: true,
+			expected:      false,
+		},
+		{
+			name:          "A true B false",
+			aMatched:      true,
+			ruleSetBMatch: false,
+			expected:      true,
+		},
+		{
+			name:          "A false B true",
+			aMatched:      false,
+			ruleSetBMatch: true,
+			expected:      false,
+		},
+		{
+			name:          "A false B false",
+			aMatched:      false,
+			ruleSetBMatch: false,
+			expected:      false,
+		},
+	}
+	for _, testCase := range testCases {
+		testCase := testCase
+		t.Run(testCase.name, func(t *testing.T) {
+			t.Parallel()
+			logicalRule := &abstractLogicalRule{
+				mode: C.LogicalTypeAnd,
+				rules: []adapter.HeadlessRule{
+					newSingleItemRule(testCase.aMatched),
+					newRuleSetOnlyRule(testCase.ruleSetBMatch, true),
+				},
+			}
+			require.Equal(t, testCase.expected, logicalRule.Match(&adapter.InboundContext{}))
+		})
+	}
+}

transport/wireguard/device_system.go

@@ -88,7 +88,7 @@ func (w *systemDevice) Start() error {
 	w.options.Logger.Info("started at ", w.options.Name)
 	w.device = tunInterface
 	batchTUN, isBatchTUN := tunInterface.(tun.LinuxTUN)
-	if isBatchTUN {
+	if isBatchTUN && batchTUN.BatchSize() > 1 {
 		w.batchDevice = batchTUN
 	}
 	w.events <- wgTun.EventUp