I found a bug with a some kind of similar message
CSCdz16841
Symptom:
Catalyst WS-C2924C-XL may report the following error:
Oct 29 11:52:04.844: Assert failure in ../src-malibu/co_addr.c line 2216
When a dynamic address is aged out or deleted by CLI.
Condition:
When a fastethernet port on a WC-C2924C-XL is configured as
a trunk port.
Workaround:
No workaround available.
first found in: 12.0(5)WC5a
first fixed in: 12.0(5)WC7
perhaps this might help you