cherry pick pingcap#30214 to release-5.1

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

executor/index_lookup_hash_join.go

@@ -336,6 +336,7 @@ func (ow *indexHashJoinOuterWorker) run(ctx context.Context) {
 	defer trace.StartRegion(ctx, "IndexHashJoinOuterWorker").End()
 	defer close(ow.innerCh)
 	for {
+		failpoint.Inject("TestIssue30211", nil)
 		task, err := ow.buildTask(ctx)
 		failpoint.Inject("testIndexHashJoinOuterWorkerErr", func() {
 			err = errors.New("mockIndexHashJoinOuterWorkerErr")

executor/index_lookup_join.go

@@ -26,8 +26,12 @@ import (
 	"unsafe"
 
 	"github.com/pingcap/errors"
+<<<<<<< HEAD
 	"github.com/pingcap/parser/mysql"
 	"github.com/pingcap/parser/terror"
+=======
+	"github.com/pingcap/failpoint"
+>>>>>>> 443f15ed4... executor: send a task with error to the resultCh when panic happen (#30214)
 	"github.com/pingcap/tidb/expression"
 	plannercore "github.com/pingcap/tidb/planner/core"
 	"github.com/pingcap/tidb/sessionctx"
@@ -322,6 +326,7 @@ func (e *IndexLookUpJoin) getFinishedTask(ctx context.Context) (*lookUpJoinTask,
 	select {
 	case err := <-task.doneCh:
 		if err != nil {
+			logutil.BgLogger().Error("task err not nil")
 			return nil, err
 		}
 	case <-ctx.Done():
@@ -359,6 +364,7 @@ func (ow *outerWorker) run(ctx context.Context, wg *sync.WaitGroup) {
 			task := &lookUpJoinTask{doneCh: make(chan error, 1)}
 			err := errors.Errorf("%v", r)
 			task.doneCh <- err
+			ow.pushToChan(ctx, task, ow.resultCh)
 			ow.lookup.ctxCancelReason.Store(err)
 			ow.lookup.cancelFunc()
 		}
@@ -367,6 +373,7 @@ func (ow *outerWorker) run(ctx context.Context, wg *sync.WaitGroup) {
 		wg.Done()
 	}()
 	for {
+		failpoint.Inject("TestIssue30211", nil)
 		task, err := ow.buildTask(ctx)
 		if err != nil {
 			task.doneCh <- err

executor/join_test.go

@@ -2609,3 +2609,39 @@ func (s *testSuiteJoinSerial) TestIssue25902(c *C) {
 	tk.MustQuery("select * from tt1 where ts in (select ts from tt2);").Check(testkit.Rows())
 	tk.MustExec("set @@session.time_zone = @tmp;")
 }
+
+func (s *testSuiteJoinSerial) TestIssue30211(c *C) {
+	tk := testkit.NewTestKit(c, s.store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t1, t2;")
+	tk.MustExec("create table t1(a int, index(a));")
+	tk.MustExec("create table t2(a int, index(a));")
+	func() {
+		fpName := "github.com/pingcap/tidb/executor/TestIssue30211"
+		c.Assert(failpoint.Enable(fpName, `panic("TestIssue30211 IndexJoinPanic")`), IsNil)
+		defer func() {
+			c.Assert(failpoint.Disable(fpName), IsNil)
+		}()
+		err := tk.QueryToErr("select /*+ inl_join(t1) */ * from t1 join t2 on t1.a = t2.a;").Error()
+		c.Assert(err, Matches, "failpoint panic: TestIssue30211 IndexJoinPanic")
+
+		err = tk.QueryToErr("select /*+ inl_hash_join(t1) */ * from t1 join t2 on t1.a = t2.a;").Error()
+		c.Assert(err, Matches, "failpoint panic: TestIssue30211 IndexJoinPanic")
+	}()
+	tk.MustExec("insert into t1 values(1),(2);")
+	tk.MustExec("insert into t2 values(1),(1),(2),(2);")
+	tk.MustExec("set @@tidb_mem_quota_query=8000;")
+	tk.MustExec("set tidb_index_join_batch_size = 1;")
+	config.UpdateGlobal(func(conf *config.Config) {
+		conf.OOMAction = config.OOMActionCancel
+	})
+	defer func() {
+		config.UpdateGlobal(func(conf *config.Config) {
+			conf.OOMAction = config.OOMActionLog
+		})
+	}()
+	err := tk.QueryToErr("select /*+ inl_join(t1) */ * from t1 join t2 on t1.a = t2.a;").Error()
+	c.Assert(strings.Contains(err, "Out Of Memory Quota"), IsTrue)
+	err = tk.QueryToErr("select /*+ inl_hash_join(t1) */ * from t1 join t2 on t1.a = t2.a;").Error()
+	c.Assert(strings.Contains(err, "Out Of Memory Quota"), IsTrue)
+}