Assume that you use Polybase feature on an instance of SQL Server 2019. Under heavy workloads, a function call to shared memory may take indefinite amount of time, and you may receive a non-yielding scheduler error.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This issue is fixed in the following cumulative update for SQL Server:
About cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server: