session: fix data race in the LazyTxn.LockKeys

DEPS.bzl

@@ -3527,16 +3527,16 @@ def go_deps():
         name = "com_github_tiancaiamao_gp",
         build_file_proto_mode = "disable",
         importpath = "github.com/tiancaiamao/gp",
-        sum = "h1:4RNtqw1/tW67qP9fFgfQpTVd7DrfkaAWu4vsC18QmBo=",
-        version = "v0.0.0-20221221095600-1a473d1f9b4b",
+        sum = "h1:J/YdBZ46WKpXsxsW93SG+q0F8KI+yFrcIDT4c/RNoc4=",
+        version = "v0.0.0-20221230034425-4025bc8a4d4a",
     )
 
     go_repository(
         name = "com_github_tikv_client_go_v2",
         build_file_proto_mode = "disable_global",
         importpath = "github.com/tikv/client-go/v2",
-        sum = "h1:m6glgBGCIds9QURbk8Mn+8mjLKDcv6nWrNwYh92fydQ=",
-        version = "v2.0.4-0.20221226080148-018c59dbd837",
+        sum = "h1:cPtMXTExqjzk8L40qhrgB/mXiBXKP5LRU0vwjtI2Xxo=",
+        version = "v2.0.4",
     )
     go_repository(
         name = "com_github_tikv_pd_client",

go.mod

@@ -90,7 +90,7 @@ require (
 	github.com/stretchr/testify v1.8.0
 	github.com/tdakkota/asciicheck v0.1.1
 	github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2
-	github.com/tikv/client-go/v2 v2.0.4-0.20221226080148-018c59dbd837
+	github.com/tikv/client-go/v2 v2.0.4
 	github.com/tikv/pd/client v0.0.0-20221031025758-80f0d8ca4d07
 	github.com/timakin/bodyclose v0.0.0-20210704033933-f49887972144
 	github.com/twmb/murmur3 v1.1.3
@@ -221,7 +221,7 @@ require (
 	github.com/shurcooL/vfsgen v0.0.0-20181202132449-6a9ea43bcacd // indirect
 	github.com/sirupsen/logrus v1.9.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
-	github.com/tiancaiamao/gp v0.0.0-20221221095600-1a473d1f9b4b // indirect
+	github.com/tiancaiamao/gp v0.0.0-20221230034425-4025bc8a4d4a // indirect
 	github.com/tklauser/go-sysconf v0.3.10 // indirect
 	github.com/tklauser/numcpus v0.4.0 // indirect
 	github.com/tmc/grpc-websocket-proxy v0.0.0-20201229170055-e5319fda7802 // indirect

go.sum

@@ -933,10 +933,10 @@ github.com/tenntenn/text/transform v0.0.0-20200319021203-7eef512accb3 h1:f+jULpR
 github.com/tenntenn/text/transform v0.0.0-20200319021203-7eef512accb3/go.mod h1:ON8b8w4BN/kE1EOhwT0o+d62W65a6aPw1nouo9LMgyY=
 github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2 h1:mbAskLJ0oJfDRtkanvQPiooDH8HvJ2FBh+iKT/OmiQQ=
 github.com/tiancaiamao/appdash v0.0.0-20181126055449-889f96f722a2/go.mod h1:2PfKggNGDuadAa0LElHrByyrz4JPZ9fFx6Gs7nx7ZZU=
-github.com/tiancaiamao/gp v0.0.0-20221221095600-1a473d1f9b4b h1:4RNtqw1/tW67qP9fFgfQpTVd7DrfkaAWu4vsC18QmBo=
-github.com/tiancaiamao/gp v0.0.0-20221221095600-1a473d1f9b4b/go.mod h1:h4xBhSNtOeEosLJ4P7JyKXX7Cabg7AVkWCK5gV2vOrM=
-github.com/tikv/client-go/v2 v2.0.4-0.20221226080148-018c59dbd837 h1:m6glgBGCIds9QURbk8Mn+8mjLKDcv6nWrNwYh92fydQ=
-github.com/tikv/client-go/v2 v2.0.4-0.20221226080148-018c59dbd837/go.mod h1:ptS8K+VBrEH2gIS3JxaiFSSLfDDyuS2xcdLozOtBWBw=
+github.com/tiancaiamao/gp v0.0.0-20221230034425-4025bc8a4d4a h1:J/YdBZ46WKpXsxsW93SG+q0F8KI+yFrcIDT4c/RNoc4=
+github.com/tiancaiamao/gp v0.0.0-20221230034425-4025bc8a4d4a/go.mod h1:h4xBhSNtOeEosLJ4P7JyKXX7Cabg7AVkWCK5gV2vOrM=
+github.com/tikv/client-go/v2 v2.0.4 h1:cPtMXTExqjzk8L40qhrgB/mXiBXKP5LRU0vwjtI2Xxo=
+github.com/tikv/client-go/v2 v2.0.4/go.mod h1:v52O5zDtv2BBus4lm5yrSQhxGW4Z4RaXWfg0U1Kuyqo=
 github.com/tikv/pd/client v0.0.0-20221031025758-80f0d8ca4d07 h1:ckPpxKcl75mO2N6a4cJXiZH43hvcHPpqc9dh1TmH1nc=
 github.com/tikv/pd/client v0.0.0-20221031025758-80f0d8ca4d07/go.mod h1:CipBxPfxPUME+BImx9MUYXCnAVLS3VJUr3mnSJwh40A=
 github.com/timakin/bodyclose v0.0.0-20210704033933-f49887972144 h1:kl4KhGNsJIbDHS9/4U9yQo1UcPQM0kOMJHn29EoH/Ro=

kv/interface_mock_test.go

@@ -52,6 +52,13 @@ func (t *mockTxn) LockKeys(_ context.Context, _ *LockCtx, _ ...Key) error {
 	return nil
 }
 
+func (t *mockTxn) LockKeysFunc(_ context.Context, _ *LockCtx, fn func(), _ ...Key) error {
+	if fn != nil {
+		fn()
+	}
+	return nil
+}
+
 func (t *mockTxn) SetOption(opt int, val interface{}) {
 	t.opts[opt] = val
 }

kv/kv.go

@@ -221,7 +221,12 @@ type Transaction interface {
 	String() string
 	// LockKeys tries to lock the entries with the keys in KV store.
 	// Will block until all keys are locked successfully or an error occurs.
+	// fn is called before LockKeys unlocks the keys.
 	LockKeys(ctx context.Context, lockCtx *LockCtx, keys ...Key) error
+	// LockKeysFunc tries to lock the entries with the keys in KV store.
+	// Will block until all keys are locked successfully or an error occurs.
+	// fn is called before LockKeys unlocks the keys.
+	LockKeysFunc(ctx context.Context, lockCtx *LockCtx, fn func(), keys ...Key) error
 	// SetOption sets an option with a value, when val is nil, uses the default
 	// value of this option.
 	SetOption(opt int, val interface{})

session/txn.go

@@ -20,7 +20,6 @@ import (
 	"fmt"
 	"runtime/trace"
 	"strings"
-	"sync"
 	"sync/atomic"
 	"time"
 
@@ -36,6 +35,7 @@ import (
 	"github.com/pingcap/tidb/tablecodec"
 	"github.com/pingcap/tidb/util/logutil"
 	"github.com/pingcap/tidb/util/sli"
+	"github.com/pingcap/tidb/util/syncutil"
 	"github.com/pingcap/tipb/go-binlog"
 	"github.com/tikv/client-go/v2/oracle"
 	"github.com/tikv/client-go/v2/tikv"
@@ -64,7 +64,7 @@ type LazyTxn struct {
 	// The data in this session would be query by other sessions, so Mutex is necessary.
 	// Since read is rare, the reader can copy-on-read to get a data snapshot.
 	mu struct {
-		sync.RWMutex
+		syncutil.RWMutex
 		txninfo.TxnInfo
 	}
 
@@ -428,6 +428,11 @@ func (txn *LazyTxn) RollbackMemDBToCheckpoint(savepoint *tikv.MemDBCheckpoint) {
 
 // LockKeys Wrap the inner transaction's `LockKeys` to record the status
 func (txn *LazyTxn) LockKeys(ctx context.Context, lockCtx *kv.LockCtx, keys ...kv.Key) error {
+	return txn.LockKeysFunc(ctx, lockCtx, nil, keys...)
+}
+
+// LockKeysFunc Wrap the inner transaction's `LockKeys` to record the status
+func (txn *LazyTxn) LockKeysFunc(ctx context.Context, lockCtx *kv.LockCtx, fn func(), keys ...kv.Key) error {
 	failpoint.Inject("beforeLockKeys", func() {})
 	t := time.Now()
 
@@ -438,15 +443,17 @@ func (txn *LazyTxn) LockKeys(ctx context.Context, lockCtx *kv.LockCtx, keys ...k
 	txn.mu.TxnInfo.BlockStartTime.Valid = true
 	txn.mu.TxnInfo.BlockStartTime.Time = t
 	txn.mu.Unlock()
-
-	err := txn.Transaction.LockKeys(ctx, lockCtx, keys...)
-
-	txn.mu.Lock()
-	defer txn.mu.Unlock()
-	txn.updateState(originState)
-	txn.mu.TxnInfo.BlockStartTime.Valid = false
-	txn.mu.TxnInfo.EntriesCount = uint64(txn.Transaction.Len())
-	return err
+	lockFunc := func() {
+		if fn != nil {
+			fn()
+		}
+		txn.mu.Lock()
+		defer txn.mu.Unlock()
+		txn.updateState(originState)
+		txn.mu.TxnInfo.BlockStartTime.Valid = false
+		txn.mu.TxnInfo.EntriesCount = uint64(txn.Transaction.Len())
+	}
+	return txn.Transaction.LockKeysFunc(ctx, lockCtx, lockFunc, keys...)
 }
 
 func (txn *LazyTxn) reset() {

sessionctx/BUILD.bazel

@@ -33,6 +33,7 @@ go_test(
     ],
     embed = [":sessionctx"],
     flaky = True,
+    race = "on",
     deps = [
         "//testkit/testsetup",
         "@com_github_stretchr_testify//require",

sessiontxn/BUILD.bazel

@@ -27,6 +27,8 @@ go_test(
         "txn_rc_tso_optimize_test.go",
     ],
     flaky = True,
+    race = "on",
+    shard_count = 2,
     deps = [
         ":sessiontxn",
         "//domain",

store/driver/txn/txn_driver.go

@@ -76,6 +76,12 @@ func (txn *tikvTxn) LockKeys(ctx context.Context, lockCtx *kv.LockCtx, keysInput
 	return txn.extractKeyErr(err)
 }
 
+func (txn *tikvTxn) LockKeysFunc(ctx context.Context, lockCtx *kv.LockCtx, fn func(), keysInput ...kv.Key) error {
+	keys := toTiKVKeys(keysInput)
+	err := txn.KVTxn.LockKeysFunc(ctx, lockCtx, fn, keys...)
+	return txn.extractKeyErr(err)
+}
+
 func (txn *tikvTxn) Commit(ctx context.Context) error {
 	err := txn.KVTxn.Commit(ctx)
 	return txn.extractKeyErr(err)