Symptoms

Assume that you have an instance of Microsoft SQL Server 2014 that has buffer pool extension (BPE) enabled. If you experience an I/O error that occurs on the BPE file, the BPE may be disabled. Additionally, some orphaned buff latches remain. This might prevent DBCC CHECKDB, CHECKPOINTING, and BACKUP LOG operations.

When this issue occurs, you may find similar error that are logged and that resemble the following:

L2 buffer pool write error…
Buffer pool extension has been disabled successfully. Deleting buffer pool extension "<file path>".
A time-out occurred while waiting for buffer latch -- type 4...
Error: 845, Severity: 17, State: 1.
Time-out occurred while waiting for buffer latch type 4 for page (<page id>)...
Error: 5901, Severity: 16, State: 1.
One or more recovery units belonging to database '<database name>' failed to generate a checkpoint. This is typically caused by lack of system resources such as disk or memory, or in some cases due to database corruption. Examine previous entries in the error log for more detailed information on this failure.
A time-out occurred while waiting for buffer latch -- type 3…


Resolution

The issue was first fixed in the following cumulative updates for SQL Server.

Cumulative Update 1 for SQL Server 2014 SP1

Cumulative Update 8 for SQL Server 2014

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. See the latest cumulative updates for SQL Server:


Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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