When Trace Flag (TF) 834 is enabled to use large page allocations in SQL Server 2019, SOS_BLOCKALLOCPARTIALLIST spin lock contention may occur.
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:
To work around this issue, you can disable TF 834.