Victimless Deadlocks And SSMS

Michael J. Swart shows a scenario where the deadlock graph fails to open in SQL Server Management Studio:

I recently got this error in Management Studio when trying to view a deadlock graph that was collected with an extended events session:

Failed to initialize deadlock control.
Key cannot be null.
Parameter name: key

I found this error in a session that included the xml_deadlock_report event.

Read on for more information, and do check the comments where Lonny Niederstadt points out that even a victimless deadlocking scenario can have an ultimate victim:  performance.

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