Wrong (negative) values in P_S memory summary tables

openxs@ao756:~/dbs/maria10.5$ bin/mysqld_safe --no-defaults --port=3311 --socket=/tmp/mariadb105.sock --performance_schema=1  --performance-schema-instrument='memory/%=ON' &

[1] 14916

openxs@ao756:~/dbs/maria10.5$ 201011 13:51:40 mysqld_safe Logging to '/home/openxs/dbs/maria10.5/data/ao756.err'.

201011 13:51:41 mysqld_safe Starting mariadbd daemon with databases from /home/openxs/dbs/maria10.5/data

openxs@ao756:~/dbs/maria10.5$ bin/mysql --socket=/tmp/mariadb105.sock performance_schema

Reading table information for completion of table and column names

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Welcome to the MariaDB monitor.  Commands end with ; or \g.

Your MariaDB connection id is 3

Server version: 10.5.7-MariaDB Source distribution

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [performance_schema]> select * from memory_summary_by_thread_by_event_name where current_number_of_bytes_used <0\G

*************************** 1. row ***************************

                   THREAD_ID: 7

                  EVENT_NAME: memory/innodb/std

                 COUNT_ALLOC: 5

                  COUNT_FREE: 29

   SUM_NUMBER_OF_BYTES_ALLOC: 728

    SUM_NUMBER_OF_BYTES_FREE: 1496

              LOW_COUNT_USED: -24

          CURRENT_COUNT_USED: -24

             HIGH_COUNT_USED: 1

    LOW_NUMBER_OF_BYTES_USED: -768

CURRENT_NUMBER_OF_BYTES_USED: -768

   HIGH_NUMBER_OF_BYTES_USED: 32

1 row in set (0,004 sec)

MariaDB [performance_schema]> select t.*, m.* from memory_summary_by_thread_by_event_name m join threads t on m.thread_id = t.thread_id where current_number_of_bytes_used <0\G

*************************** 1. row ***************************

                   THREAD_ID: 7

                        NAME: thread/innodb/thread_pool_thread

                        TYPE: BACKGROUND

              PROCESSLIST_ID: NULL

            PROCESSLIST_USER: NULL

            PROCESSLIST_HOST: NULL

              PROCESSLIST_DB: NULL

         PROCESSLIST_COMMAND: NULL

            PROCESSLIST_TIME: NULL

           PROCESSLIST_STATE: NULL

            PROCESSLIST_INFO: NULL

            PARENT_THREAD_ID: NULL

                        ROLE: NULL

                INSTRUMENTED: YES

                     HISTORY: YES

             CONNECTION_TYPE: Error

                THREAD_OS_ID: 15007

                   THREAD_ID: 7

                  EVENT_NAME: memory/innodb/std

                 COUNT_ALLOC: 5

                  COUNT_FREE: 29

   SUM_NUMBER_OF_BYTES_ALLOC: 728

    SUM_NUMBER_OF_BYTES_FREE: 1496

              LOW_COUNT_USED: -24

          CURRENT_COUNT_USED: -24

             HIGH_COUNT_USED: 1

    LOW_NUMBER_OF_BYTES_USED: -768

CURRENT_NUMBER_OF_BYTES_USED: -768

   HIGH_NUMBER_OF_BYTES_USED: 32

1 row in set (0,005 sec)