https://www.cisco.com/c/en/us/support/docs/field-notices/723/fn72335.html
Field Notice: FN - 72335 - APIC Upgrade to Release to 4.1(1) or Later Prompts "ifc_reader" Crash -...
After a Cisco Application Policy Infrastructure Controller (APIC) has completed the upgrade process from a release earlier than 4.1(1) to Release 4.1(1) or...