unknown, unrecognized or corrupted I/O function code

    Facility: EFI$CP, The OpenVMS EFI Partition Control Program

    Explanation: an internal error has been detected, and an I/O
    function code is unrecognized, unsupported, or corrupted.

    User Action: An internal error has been detected. Please contact
    support. If this error can be reproduced with a specific command
    or a specific command sequence, please provide the reproducer.