Are other messages responding +UVM_VERBOSITY=UVM_LOW?
Where are you configuring uvm_mem_mam? If it’s done before calling run_test(), the command line has not been read yet. Try putting a `uvm_info message just before constructing uvm_mem_mam.
Maybe this was added to display statements from Register Model, but since uvm_mem_mam.svh also has the ID as RegModel the UVM_LOW from commandline was overridden. Once I comment that statment out, no longer have "Attempting to reserve … "
Why is uvm_mem_mam.svh having ID RegModel? Can UVM library make it RegMem or something?