Vivado: inferred exception to break timing loop: 'set_false_path -through ...'

[hermitengineer]

Trying to track down the source of this warning.  The full message is:

[Synth 8-326] inferred exception to break timing loop: 'set_false_path -through i_48/i_54/O'

The problem is, no search parameters turn up the above path component.  How can I find the offending item(s)?  (there are 14 of these warnings, each with a slightly different instance).