MDEV-8391: encryption.innodb-page_encryption_compression fails

Test create_or_replace should make sure that background decrypt
operation is finished and flush all dirty pages using restart
to clean up the database before ending.

mysql-test/suite/encryption/r/create_or_replace.result

@@ -13,5 +13,9 @@ INSERT IGNORE INTO `table0_int_autoinc` ( `col_int_key` ) VALUES ( 1 ), ( 3 ), (
 INSERT IGNORE INTO `table1_int_autoinc` ( `col_int` ) VALUES ( 1 ), ( 0 ), ( 7 ), ( 9 );
 INSERT IGNORE INTO `table10_int_autoinc` ( `col_int` ) VALUES ( 6 ), ( 2 ), ( 3 ), ( 6 );
 drop table if exists create_or_replace_t, table1_int_autoinc, table0_int_autoinc, table10_int_autoinc;
+SET GLOBAL innodb_encrypt_tables = OFF;
+SET GLOBAL innodb_encryption_threads = 4;
+# Wait max 10 min for key encryption threads to decrypt all spaces
+# Success!
 SET GLOBAL innodb_encryption_threads = 0;
 SET GLOBAL innodb_encrypt_tables = OFF;

mysql-test/suite/encryption/t/create_or_replace.opt

+--innodb-tablespaces-encryption

mysql-test/suite/encryption/t/create_or_replace.test

@@ -105,5 +105,36 @@ drop table if exists create_or_replace_t, table1_int_autoinc, table0_int_autoinc
 --disconnect con2
 --enable_abort_on_error
 --enable_warnings
+
+SET GLOBAL innodb_encrypt_tables = OFF;
+SET GLOBAL innodb_encryption_threads = 4;
+
+--echo # Wait max 10 min for key encryption threads to decrypt all spaces
+let $cnt=600;
+while ($cnt)
+{
+    let $success=`SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0`;
+    if ($success)
+    {
+        let $cnt=0;
+    }
+    if (!$success)
+    {
+        real_sleep 1;
+        dec $cnt;
+    }
+}
+if (!$success)
+{
+    SELECT * FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION;
+    SHOW STATUS LIKE 'innodb_encryption%';
+    -- die Timeout waiting for encryption threads
+}
+--echo # Success!
+
 SET GLOBAL innodb_encryption_threads = 0;
 SET GLOBAL innodb_encrypt_tables = OFF;
+
+# Make sure that all dirty pages are flushed
+
+-- source include/restart_mysqld.inc