239

Explanation
An error occurred during the processing associated
with SVC 57, which frees a buffer or extends the unscheduled text
(via the FREEDBUF macro issued either by the user or the system).
 The BDAM task recovery routine for this SVC determined that a control
block required as input to SVC 57 was not in the user's region and/or
key.  This system completion code is accompanied by message IEC902I.
Refer to the explanation of message IEC902I for complete information
about the task that was ended and for an explanation of the return
code in register 15.

System action
Message IEC902I is issued, specifying a cleanup
code that indicates the results of the cleanup of resources attempted
by the recovery routine.

Operator response
Start a generalized trace facility (GTF) trace,
and re-create the problem.  Reply to message AHL100A with:      TRACE=SYS,USR,SLIP

On
the DD statement for the data set in error, specify:      DCB=DIAGNS=TRACE

System programmer response
  If the error recurs and the program
is not in error, search problem reporting data bases for a fix for
the problem. If no fix exists, contact the IBM® Support Center. Provide the SYSOUT output
for the job.

Programmer response
Insure the validity of the control block
from which the address of the block in error was taken.  The DECB
and DCB were specified in the FREEDBUF macro as input to the SVC.
 Make sure that the DCBBUFCB field in the DCB contains the correct
address of the buffer control block and the DCBDYNB field contains
the correct address of the unscheduled list (if address space was
virtual).  The BCB or USL contain the address of the next IOB waiting
to get a buffer, if one was not available.  Ensure that this address
has not been overlaid.  Make sure also that the input DECB contains
the address of the buffer being freed (DECAREA field) and, if a buffer
was requested for keys also, that the DECKYADR field contains the
correct address.

Source
DFSMSdfp