diff --git a/mysql-test/main/subselect.result b/mysql-test/main/subselect.result
index 0b22d6246ea..c57cae70965 100644
--- a/mysql-test/main/subselect.result
+++ b/mysql-test/main/subselect.result
@@ -7384,6 +7384,17 @@ a
 drop table t1,t2,t3;
 # End of 10.2 tests
 #
+# MDEV-29926: ASAN heap-use-after-free in Explain_query::~Explain_query
+#
+CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;
+EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";
+COUNT(*)
+0
+DROP TABLE t;
+#
+# End of 10.3 tests
+#
+#
 # Start of 10.4 tests
 #
 #
diff --git a/mysql-test/main/subselect.test b/mysql-test/main/subselect.test
index 4ecd0da9d57..187dc80b4b4 100644
--- a/mysql-test/main/subselect.test
+++ b/mysql-test/main/subselect.test
@@ -6290,6 +6290,20 @@ drop table t1,t2,t3;
 
 --echo # End of 10.2 tests
 
+--echo #
+--echo # MDEV-29926: ASAN heap-use-after-free in Explain_query::~Explain_query
+--echo #
+
+CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;
+EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";
+
+# Cleanup
+DROP TABLE t;
+
+--echo #
+--echo # End of 10.3 tests
+--echo #
+
 
 --echo #
 --echo # Start of 10.4 tests
diff --git a/mysql-test/main/subselect_no_exists_to_in.result b/mysql-test/main/subselect_no_exists_to_in.result
index 72f37ae70bc..8746f7278c3 100644
--- a/mysql-test/main/subselect_no_exists_to_in.result
+++ b/mysql-test/main/subselect_no_exists_to_in.result
@@ -7384,6 +7384,17 @@ a
 drop table t1,t2,t3;
 # End of 10.2 tests
 #
+# MDEV-29926: ASAN heap-use-after-free in Explain_query::~Explain_query
+#
+CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;
+EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";
+COUNT(*)
+0
+DROP TABLE t;
+#
+# End of 10.3 tests
+#
+#
 # Start of 10.4 tests
 #
 #
diff --git a/mysql-test/main/subselect_no_mat.result b/mysql-test/main/subselect_no_mat.result
index c85fa8b83d9..f0d788d6b4a 100644
--- a/mysql-test/main/subselect_no_mat.result
+++ b/mysql-test/main/subselect_no_mat.result
@@ -7377,6 +7377,17 @@ a
 drop table t1,t2,t3;
 # End of 10.2 tests
 #
+# MDEV-29926: ASAN heap-use-after-free in Explain_query::~Explain_query
+#
+CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;
+EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";
+COUNT(*)
+0
+DROP TABLE t;
+#
+# End of 10.3 tests
+#
+#
 # Start of 10.4 tests
 #
 #
diff --git a/mysql-test/main/subselect_no_opts.result b/mysql-test/main/subselect_no_opts.result
index aa5363c362b..91e82ca838f 100644
--- a/mysql-test/main/subselect_no_opts.result
+++ b/mysql-test/main/subselect_no_opts.result
@@ -7375,6 +7375,17 @@ a
 drop table t1,t2,t3;
 # End of 10.2 tests
 #
+# MDEV-29926: ASAN heap-use-after-free in Explain_query::~Explain_query
+#
+CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;
+EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";
+COUNT(*)
+0
+DROP TABLE t;
+#
+# End of 10.3 tests
+#
+#
 # Start of 10.4 tests
 #
 #
diff --git a/mysql-test/main/subselect_no_scache.result b/mysql-test/main/subselect_no_scache.result
index 038933efe39..1cc69ef4e85 100644
--- a/mysql-test/main/subselect_no_scache.result
+++ b/mysql-test/main/subselect_no_scache.result
@@ -7390,6 +7390,17 @@ a
 drop table t1,t2,t3;
 # End of 10.2 tests
 #
+# MDEV-29926: ASAN heap-use-after-free in Explain_query::~Explain_query
+#
+CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;
+EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";
+COUNT(*)
+0
+DROP TABLE t;
+#
+# End of 10.3 tests
+#
+#
 # Start of 10.4 tests
 #
 #
diff --git a/mysql-test/main/subselect_no_semijoin.result b/mysql-test/main/subselect_no_semijoin.result
index 4451a4b2b8d..7dbee3ff882 100644
--- a/mysql-test/main/subselect_no_semijoin.result
+++ b/mysql-test/main/subselect_no_semijoin.result
@@ -7375,6 +7375,17 @@ a
 drop table t1,t2,t3;
 # End of 10.2 tests
 #
+# MDEV-29926: ASAN heap-use-after-free in Explain_query::~Explain_query
+#
+CREATE TABLE t (a VARCHAR(1)) CHARACTER SET utf8mb3;
+EXECUTE IMMEDIATE "SELECT COUNT(*) FROM t WHERE a < (SELECT 'x')";
+COUNT(*)
+0
+DROP TABLE t;
+#
+# End of 10.3 tests
+#
+#
 # Start of 10.4 tests
 #
 #
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 5ec88e5259c..c3c4e52f6e4 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -1204,6 +1204,15 @@ JOIN::prepare(TABLE_LIST *tables_init,
   // simple check that we got usable conds
   dbug_print_item(conds);
 
+  /*
+    It is hack which force creating EXPLAIN object always on runt-time arena
+    (because very top JOIN::prepare executes always with runtime arena, but
+    constant subquery like (SELECT 'x') can be called with statement arena
+    during prepare phase of top SELECT).
+  */
+  if (!(thd->lex->context_analysis_only & CONTEXT_ANALYSIS_ONLY_PREPARE))
+      create_explain_query_if_not_exists(thd->lex, thd->mem_root);
+
   if (select_lex->handle_derived(thd->lex, DT_PREPARE))
     DBUG_RETURN(-1);
 
@@ -1654,7 +1663,6 @@ bool JOIN::build_explain()
 int JOIN::optimize()
 {
   int res= 0;
-  create_explain_query_if_not_exists(thd->lex, thd->mem_root);
   join_optimization_state init_state= optimization_state;
   if (select_lex->pushdown_select)
   {