server: add tests for empty query hang (#22740)

pingcap · Feb 11, 2021 · d6a2b9a · d6a2b9a
1 parent 8fe8ecd
commit d6a2b9a
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Showing 2 changed files with 17 additions and 0 deletions.
diff --git a/server/server_test.go b/server/server_test.go
@@ -1555,6 +1555,22 @@ func (cli *testServerClient) runTestIssue3680(c *C) {
 	c.Assert(err.Error(), Equals, "Error 1045: Access denied for user 'non_existing_user'@'127.0.0.1' (using password: NO)")
 }
 
+func (cli *testServerClient) runTestIssue22646(c *C) {
+	cli.runTests(c, nil, func(dbt *DBTest) {
+		c1 := make(chan string, 1)
+		go func() {
+			dbt.mustExec(``) // empty query.
+			c1 <- "success"
+		}()
+		select {
+		case res := <-c1:
+			fmt.Println(res)
+		case <-time.After(30 * time.Second):
+			panic("read empty query statement timed out.")
+		}
+	})
+}
+
 func (cli *testServerClient) runTestIssue3682(c *C) {
 	cli.runTests(c, nil, func(dbt *DBTest) {
 		dbt.mustExec(`CREATE USER 'issue3682'@'%' IDENTIFIED BY '123';`)

diff --git a/server/tidb_test.go b/server/tidb_test.go
@@ -196,6 +196,7 @@ func (ts *tidbTestSuite) TestIssues(c *C) {
 	c.Parallel()
 	ts.runTestIssue3662(c)
 	ts.runTestIssue3680(c)
+	ts.runTestIssue22646(c)
 }
 
 func (ts *tidbTestSuite) TestDBNameEscape(c *C) {