PMM not stopping when DB connection interrupted during backup

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TITLE:

PMM not stopping when DB connection interrupted during backup​

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE:

Onyx 17.8 latest MU
CentOS 7.6​

PROBLEM DESCRIPTION:

During a scheduled backup process the database server has stopped. The stop is not related to the backup. The database server was restarted, all databases accessible. But the stopped database server lead to a situation where the PMM process(es) keep running endlessly without proceeding with the backup. The PMM process(es) needed to be killed (-9) to stop the the backup process, create the backup error in the GUI and being able to restart the backup process.​

STEPS TO REPRODUCE:

Start a scheduled backup process. While the backup is running, stop the database server. Wait e.g. for 30 minutes, then restart the database server.​

ACTUAL RESULT:

Backup will sit in the process list doing nothing until it is killed.​

EXPECTED RESULT:

Either backup process should quit with an error messages after a timeout or it should recover and continue with the backup once the database server is accessible again.​

ANY ADDITIONAL INFORMATION:

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YOUR EXPECTATIONS FROM PLESK SERVICE TEAM:

Confirm bug​