016

Explanation
An error occurred in the sequential access method
(SAM) SIO/PAGE FIX or direct access storage device (DASD) end-of-block
modules. A reason code (hexadecimal) further explains the error: Code
Explanation
04
The DASD end-of-block modules issued an EXCPVR SVC request on
behalf of a user request, but a previous EXCPVR SVC request has not
yet completed.  One of the following occurred: A data event control block (DECB) was used twice.
Multiple READs or WRITEs were issued, but CHECK macros were not
issued for those requests in the same order.

 The SAM SIO/PAGE FIX appendage issued this abend.
08
An EXCPVR SVC request on behalf of a user request was going to
be issued to read a data set that is RACF® EXECUTE
access protected, but the user is not in supervisor state.  The SAM
SIO appendage issued this abend.

System action
The system abnormally ends the task.

System programmer response
If the EXCPVR SVC request was issued
before the first request was completed, ensure that the DECB that
is created for the READ/WRITE operation is tested for successful completion
before it is reused.  Also, ensure that the CHECK macros are issued
in the same order as the associated READ or WRITE macros.
Otherwise,
unless the task is in supervisor state, do not attempt to read a data
set that is protected with RACF EXECUTE
access authority.

Source
DFSMSdfp