MDEV-25562 Assertion `pause_seqno_.is_undefined() == false' failed in void...

MDEV-25562 Assertion `pause_seqno_.is_undefined() == false' failed in void wsrep::server_state::resume()

If pause() is not executed in galera and returns seqno = -1 we should
skip resume().

mysql-test/suite/galera/r/MDEV-25562.result

+connection node_2;
+connection node_1;
+SET SESSION WSREP_ON=0;
+FLUSH TABLES WITH READ LOCK AND DISABLE CHECKPOINT;
+SET SESSION WSREP_ON=1;
+UNLOCK TABLES;
+SET GLOBAL wsrep_ignore_apply_errors=1;
+CREATE TABLE t1 (a CHAR(1)) engine=innodb;
+CREATE TABLE t1 (a CHAR(1)) engine=innodb;
+ERROR 42S01: Table 't1' already exists
+SHOW PROCEDURE STATUS WHERE db = 'test';
+Db	Name	Type	Definer	Modified	Created	Security_type	Comment	character_set_client	collation_connection	Database Collation
+SET GLOBAL read_only=1;
+SET GLOBAL wsrep_ignore_apply_errors=DEFAULT;
+SET GLOBAL read_only=DEFAULT;
+DROP TABLE t1;

mysql-test/suite/galera/t/MDEV-25562.test

+#
+# MDEV-25562 Assertion `pause_seqno_.is_undefined() == false' failed in void wsrep::server_state::resume()
+#
+
+--source include/galera_cluster.inc
+--source include/have_innodb.inc
+
+SET SESSION WSREP_ON=0;
+FLUSH TABLES WITH READ LOCK AND DISABLE CHECKPOINT;
+SET SESSION WSREP_ON=1;
+UNLOCK TABLES;
+
+SET GLOBAL wsrep_ignore_apply_errors=1;
+CREATE TABLE t1 (a CHAR(1)) engine=innodb;
+--error ER_TABLE_EXISTS_ERROR
+CREATE TABLE t1 (a CHAR(1)) engine=innodb;
+SHOW PROCEDURE STATUS WHERE db = 'test';
+SET GLOBAL read_only=1;
+
+SET GLOBAL wsrep_ignore_apply_errors=DEFAULT;
+SET GLOBAL read_only=DEFAULT;
+DROP TABLE t1;
+

sql/lock.cc

@@ -1102,21 +1102,22 @@ void Global_read_lock::unlock_global_read_lock(THD *thd)
   thd->mdl_context.release_lock(m_mdl_global_read_lock);
 
 #ifdef WITH_WSREP
-  if (m_state == GRL_ACQUIRED_AND_BLOCKS_COMMIT)
+  if (m_state == GRL_ACQUIRED_AND_BLOCKS_COMMIT &&
+      wsrep_locked_seqno != WSREP_SEQNO_UNDEFINED)
   {
     Wsrep_server_state& server_state= Wsrep_server_state::instance();
     if (server_state.state() == Wsrep_server_state::s_donor ||
         (WSREP_NNULL(thd) &&
          server_state.state() != Wsrep_server_state::s_synced))
     {
-      /* TODO: maybe redundant here?: */
-      wsrep_locked_seqno= WSREP_SEQNO_UNDEFINED;
       server_state.resume();
+      wsrep_locked_seqno= WSREP_SEQNO_UNDEFINED;
     }
     else if (WSREP_NNULL(thd) &&
              server_state.state() == Wsrep_server_state::s_synced)
     {
       server_state.resume_and_resync();
+      wsrep_locked_seqno= WSREP_SEQNO_UNDEFINED;
     }
   }
 #endif /* WITH_WSREP */