ProcessInput Method Kept A Reference To The Buffer

Hi

I have written a custom data flow component that counts the rows coming through the pipeline and adds the counts to an object stored in a package variable.

The component sometimes generates warnings with the following message - "A call to the ProcessInput method for input 358 on component "<Component Name>" (354) unexpectedly kept a reference to the buffer it was passed. The refcount on that buffer was 4 before the call, and 5 after the call returned.".

The component is used several times throughout ~60 packages. It does not always occur on the same instance, or even in the same package, from one occasion to another. When all the packages are executed (from a master package - some in parallel and some in series) the warning is generated several times (around 10), but the warning is not generated at all when the packages are executed individually from BIDS. The values of the refcounts vary from message to message, but the difference is always 1 more after the call than it was before. The server has SP1 and the hotfix package installed, but the warning was being generated before SP1.

I do not understand what could be keeping a reference to the buffer. The ProcessInput method is very basic:

public override void ProcessInput(int inputID, PipelineBuffer buffer)
{
try
{
if (!buffer.EndOfRowset)
{
totalRowCount += buffer.RowCount;
}
}
catch (Exception ex)
{
bool cancel = false;
ComponentMetaData.FireError(0, ComponentMetaData.Name, ex.Message, string.Empty, 0, out cancel);
throw new Exception("Could not process input.", ex);
}
}

Does anyone have any idea what could be causing this, or ideas for things I should be investigating?

TIA . . . Ed