mysqld process hangs when stopped after executing mysql_upgrade

Steps to reproduce

1. Initializing the MariaDB data directory

   C:\Users\Administrator>C:\mariadb-10.5.12-winx64\bin\mysql_install_db.exe --datadir=C:\db --service=MyDB --password=secret

   Running bootstrap

   2021-08-09 17:56:17 0 [Note] C:\mariadb-10.5.12-winx64\bin\mysqld.exe (mysqld 10.5.12-MariaDB) starting as process 1212 ...

   Removing default user

   Setting root password

   Creating my.ini file

   Registering service 'MyDB'

   Creation of the database was successful

2. Upload the C:\db\my.ini file

   [mysqld]

   datadir=C:/db

   skip-grant-tables

   skip-networking

   enable-named-pipe

   [client]

   plugin-dir=C:/mariadb-10.5.12-winx64/lib/plugin

3. Start service

   C:\Users\Administrator>sc start MyDB

4. Start mysql_upgrade

   C:\Users\Administrator>C:\mariadb-10.5.12-winx64\bin\mysql_upgrade.exe --force --host=. --protocol=pipe

   Phase 1/7: Checking and upgrading mysql database

   Processing databases

   mysql

   mysql.column_stats OK

   mysql.columns_priv OK

   mysql.db OK

   mysql.event OK

   mysql.func OK

   mysql.global_priv OK

   mysql.gtid_slave_pos OK

   mysql.help_category OK

   mysql.help_keyword OK

   mysql.help_relation OK

   mysql.help_topic OK

   mysql.index_stats OK

   mysql.innodb_index_stats OK

   mysql.innodb_table_stats OK

   mysql.plugin OK

   mysql.proc OK

   mysql.procs_priv OK

   mysql.proxies_priv OK

   mysql.roles_mapping OK

   mysql.servers OK

   mysql.table_stats OK

   mysql.tables_priv OK

   mysql.time_zone OK

   mysql.time_zone_leap_second OK

   mysql.time_zone_name OK

   mysql.time_zone_transition OK

   mysql.time_zone_transition_type OK

   mysql.transaction_registry OK

   Phase 2/7: Installing used storage engines... Skipped

   Phase 3/7: Fixing views

   mysql.user OK

   Phase 4/7: Running 'mysql_fix_privilege_tables'

   Phase 5/7: Fixing table and database names

   Phase 6/7: Checking and upgrading tables

   Processing databases

   information_schema

   performance_schema

   test

   Phase 7/7: Running 'FLUSH PRIVILEGES'

   OK

5. Stop service

   C:\Users\Administrator>sc stop MyDB

Actual result
mysqld process hands.
In the log file:

2021-08-09 17:56:17 0 [Note] InnoDB: The first innodb_system data file 'ibdata1' did not exist. A new tablespace will be created!

2021-08-09 17:56:17 0 [Note] InnoDB: Uses event mutexes

2021-08-09 17:56:17 0 [Note] InnoDB: Compressed tables use zlib 1.2.11

2021-08-09 17:56:17 0 [Note] InnoDB: Number of pools: 1

2021-08-09 17:56:17 0 [Note] InnoDB: Using generic crc32 instructions

2021-08-09 17:56:17 0 [Note] InnoDB: Initializing buffer pool, total size = 134217728, chunk size = 134217728

2021-08-09 17:56:17 0 [Note] InnoDB: Completed initialization of buffer pool

2021-08-09 17:56:17 0 [Note] InnoDB: Setting file '.\ibdata1' size to 12 MB. Physically writing the file full; Please wait ...

2021-08-09 17:56:17 0 [Note] InnoDB: File '.\ibdata1' size is now 12 MB.

2021-08-09 17:56:17 0 [Note] InnoDB: Setting log file .\ib_logfile101 size to 100663296 bytes

2021-08-09 17:56:18 0 [Note] InnoDB: Renaming log file .\ib_logfile101 to .\ib_logfile0

2021-08-09 17:56:18 0 [Note] InnoDB: New log file created, LSN=10317

2021-08-09 17:56:18 0 [Note] InnoDB: Doublewrite buffer not found: creating new

2021-08-09 17:56:18 0 [Note] InnoDB: Doublewrite buffer created

2021-08-09 17:56:18 0 [Note] InnoDB: 128 rollback segments are active.

2021-08-09 17:56:18 0 [Note] InnoDB: Creating foreign key constraint system tables.

2021-08-09 17:56:18 0 [Note] InnoDB: Creating tablespace and datafile system tables.

2021-08-09 17:56:18 0 [Note] InnoDB: Creating sys_virtual system tables.

2021-08-09 17:56:18 0 [Note] InnoDB: Creating shared tablespace for temporary tables

2021-08-09 17:56:18 0 [Note] InnoDB: Setting file '.\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...

2021-08-09 17:56:18 0 [Note] InnoDB: File '.\ibtmp1' size is now 12 MB.

2021-08-09 17:56:18 0 [Note] InnoDB: 10.5.12 started; log sequence number 0; transaction id 7

2021-08-09 17:56:18 0 [Note] Plugin 'FEEDBACK' is disabled.

2021-08-09 18:00:41 0 [Note] InnoDB: Uses event mutexes

2021-08-09 18:00:41 0 [Note] InnoDB: Compressed tables use zlib 1.2.11

2021-08-09 18:00:41 0 [Note] InnoDB: Number of pools: 1

2021-08-09 18:00:41 0 [Note] InnoDB: Using generic crc32 instructions

2021-08-09 18:00:41 0 [Note] InnoDB: Initializing buffer pool, total size = 134217728, chunk size = 134217728

2021-08-09 18:00:41 0 [Note] InnoDB: Completed initialization of buffer pool

2021-08-09 18:00:41 0 [Note] InnoDB: 128 rollback segments are active.

2021-08-09 18:00:41 0 [Note] InnoDB: Creating shared tablespace for temporary tables

2021-08-09 18:00:41 0 [Note] InnoDB: Setting file '.\ibtmp1' size to 12 MB. Physically writing the file full; Please wait ...

2021-08-09 18:00:41 0 [Note] InnoDB: File '.\ibtmp1' size is now 12 MB.

2021-08-09 18:00:41 0 [Note] InnoDB: 10.5.12 started; log sequence number 45094; transaction id 20

2021-08-09 18:00:41 0 [Note] Plugin 'FEEDBACK' is disabled.

2021-08-09 18:00:41 0 [Note] Reading of all Master_info entries succeeded

2021-08-09 18:00:41 0 [Note] Added new Master_info '' to hash table

2021-08-09 18:00:41 0 [Note] C:\mariadb-10.5.12-winx64\bin\mysqld.exe: ready for connections.

Version: '10.5.12-MariaDB'  socket: ''  port: 0  mariadb.org binary distribution

2021-08-09 18:00:41 0 [Note] InnoDB: Loading buffer pool(s) from C:\db\ib_buffer_pool

2021-08-09 18:00:41 0 [Note] InnoDB: Buffer pool(s) load completed at 210809 18:00:41

2021-08-09 18:02:13 15 [Warning] Access denied for user 'root'@'localhost' (using password: NO)

2021-08-09 18:04:09 0 [Note] C:\mariadb-10.5.12-winx64\bin\mysqld.exe (initiated by: unknown): Normal shutdown