Data loss on 10.1.20-MariaDB

Since we changed from MySQL to MariDB 10.1.20 we expecting data integrity problems. Some deeper investigations aproved that fact and we would have a resolution for this Problem:

In our test case we have two nodes connected over lan and have a typical replication between them:

SystemA <---> SystemB

From SystemC we have started mysqlslap on SystemA to generate some queries:

CREATE DATABASE perftest;

CREATE TABLE perftest.a (ID int NOT NULL AUTO_INCREMENT, b TEXT, PRIMARY KEY (ID)) ENGINE=MyISAM;

mysqlslap -h SystemA -p --delimiter=";" --query="INSERT INTO perftest.a (b) VALUES(NOW())" --concurrency=500 --iterations=200

In the meantime of the generation we stopped on SystemB the slave and started after some seconds again

stop slave;

start slave;

We are waiting a while until SystemA has a count of 100000 inserts = mysqlslap has finished the generation:

select count(*) from perftest.a;

Repeat the above count on SystemB(Slave) where we have stopped and started the slave, you will see a huge difference. In other words, we have a data loss!