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Negative Blocking Session IDs

Bob Dorr explains what those negative session IDs actually mean:

SQL Server may report a blocking session id as a negative integer value. SQL Server uses negative sessions ids to indicate special conditions.​​ 

Click through for the table. Bob also includes information on -5, the “any task/session can release the latch” scenario. This also covers information on the latches themselves and is worth keeping around in case you run into an issue at some point.