PM76357: ABENDS402 IN VTAM DUE TO A BAD ECB ADDRESS PASSED FROM MODULE DFSCM7V0. 12/11/01 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• S402 abend was issued by VTAM in the IMS address space. This
  abend was due to a bad ECB address passed to VTAM on a CHANGE
  request made by Csect CM7VVGR.
   The sequence of events was that the SCIP exit was driven for
  a BIND request for an MSC Link. The receiving IMS had fewer
  sessions than Links defined. During processing in DFSCM7A0
  the code detected that there was no LXB available for this
  new session and prepared to issue a DFS3213 message. There
  was a logic error in the routine that builds the RPL and NIB
  

Local fix

• when sending this error message and the ECB address placed in
  the RPL was a residual value. Instead of passing a valid
  ECB on the Change request the SAP address was in the RPLECB
  field.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS V11 users with MSC VTAM links,       *
  *                 Generic Resources active, and APAR           *
  *                 PM24942/UK64086.                             *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABENDS402 in VTAM due to a bad ECB      *
  *                      address passed in RPLECB by             *
  *                      DFSCM7V0.                               *
  *                                                              *
  *                      This is a retro-fit of APAR PM76240.    *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  ABENDS402 is issued by VTAM in the IMS address space. This
  abend was due to an invalid value passed in RPLECB to VTAM on
  a CHANGE ENDAFFNF request made by DFSCM7V0.  The failing
  sceanario is as follows:
  
  1. The SCIP exit was driven for a BIND request for an MSC
     Link.
  
  2. Due to maximum sessions reached on this IMS, no LXB was
     available for this session.
  
  3. DFSCM7A2 detects that an LXB is not available and does not
     store the LXB ECB into RPLECB.  However, whatever residual
     value was in R10 (in this case, the SAP address) is stored
     into RPLECB.
  
  4. Code added by APAR PM24942 to use RPLECB expected a valid
     value.  Thus, when a CHANGE ENDAFFNF was issued with an
     invalid value in RPLECB, VTAM abended with an ABENDS402.
  

Problem conclusion

• GEN:
  KEYWORDS:
  
  *** END IMS KEYWORDS ***
  DFSCM7A0 has been modified to store zeros into RPLECB if an
  LXB block is not available.
  
  DFSCM7V0 has been modified to check the value in RPLECB.
  If the value is zero's the CHANGE ENDAFFNF call will not
  be issued.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PM76240

• APAR is sysrouted TO one or more of the following:

  UK83546

Modules/Macros

•    DFSCM7A0 DFSCM7V0
  

Fix information

• Fixed component name

  IMS V11

• Fixed component ID

  5635A0200

Applicable component levels

• R102 PSY UK83546

     UP12/11/21 P F211 ®

Fix is available

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