Abend in user exit ISTEXCCS, ISTEXCSD, ISTEXCAA, or ISTEXCVR

Problem statement

A failure occurred when running VTAM® Exit Facility Subtask. If an ABEND code occurs in user exit ISTEXCCS, ISTEXCSD, ISTEXCAA, or ISTEXCVR, a VTAM ESTAE will attempt to take a dump for the abnormally ending user exit.

Common symptoms

An ABEND code occurred. If VTAM attempts to issue the SDUMPX, message IST413I will be issued. If SDUMPX is issued but the dump fails, message IST257I will give the reason code for the dump failure.

Note that the VRDATA KEY=DAE macro is issued before issuing the SDUMPX to make the dump eligible for MVS™ DAE (Dump Analysis and Elimination) dump suppression. Thus, if the user has DAE in effect at the time of the errors, duplicate dumps with matching symptoms will be suppressed by the MVS DAE facility, and VTAM will issue the following message:

IST257I VTAM SDUMP FAILED WITH RETURN CODE 08 REASON X'0B'

Probable cause

The following list shows some of the common problems with user-written exits:

The pointer to the VTAM Exit Services parameter list was not valid when the session management exit called VTAM EXIT Services.
The pointer to the EXMPL (the pointer to the input parameter list in the VTAM Exit Services parameter list) was nonzero, but was not valid when the exit called VTAM Exit Services.
The pointer to the message text in the EXMPL was nonzero, but was not valid when the exit called VTAM Exit Services.
Some portion of the message text could not be accessed by VTAM Exit Services. (For example, the session management exit passed a message length in the EXMPL that exceeded the storage area owned by the Session Management Exit.)

User response

Consult the symptom string or PSW and registers, or both, at the time of ABEND. Consult any related storage or addresses in the dump.