What does “lock | communication buffer resources” mean?

Question

I have an error log which reports a deadlock:

Transaction (Process ID 55) was deadlocked on lock | communication buffer resources wit

Answer 1

You can use MAXDOP 1 as a query hint - i.e. run that query on one cpu - without affecting the rest of the server.

This will avoid the error for that query - doesn't tell you why it's failing but does provide a work-around if you have to get it working fast :-)