PM80682: ABEND0C4 IN CM7VVGR AFTER /RST LINK ALL WITH VGR ACTIVE. THE ECBADDRESS PASSED TO VTAM IS INVALID. 13/01/16 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• An ABEND0C4 occurred in module DFSCM7V0 routine CM7VVGR when an
  invalid ECB address (RPLECB) is passed to VTAM module ISTAICI2
  on a CHANGE ENDAFFIN call. The ABEND occurred in an environment
  with VGR active and APAR PM74023 applied. The invalid address
  was passed to VTAM in R10 and appears in R8 at ABEND. The logs
  show a DFS3201 MAXIMUM SESSIONS REACHED message was issued for
  the MSC link immediately before the ABEND. The output RPL for
  the MSC link is being used to issue the RPLCHNG call, but it has
  not been initialized yet resulting in the ABEND0C4.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All IMS V11 users with PM73190/UK82566       *
  *                 and using MSC VTAM links and VTAM Generic    *
  *                 Resources.                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: An ABENDS0C4 occurred in module         *
  *                      DFSCM7V0 routine CM7VVGR due to a       *
  *                      residual value in RPLECB.               *
  *                                                              *
  *                      This is a retro-fit APAR PM80478.       *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  After APAR PM73190/UK82566, an ABEND0C4 occurs in module
  DFSCM7V0 due to an invalid ECB (RPLECB) address.  The problem
  occurs as follows:
  
  1. A cold MSC session is initiated via a /RST LINK command.
  
  2. Due to maximum sessions reached, a MSGDFS3201 message
     is issued.  As a result of this, DFSCM7A0 does not
     initialize the RPL in the output buffer.  CTB7INIT is not
     set to indicate that the RPL has been initialized.
  
  3. DFSCM7V0 gets control and issues a CHANGE ENDAFFNF request
     to VTAM since APAR PM73190 removed the code to check for
     CTB7INIT to determine if the RPLs have been initialized.
  
     Using the residual data in RPLECB results in the abend.
  

Problem conclusion

• GEN:
  KEYWORDS:
  
  *** END IMS KEYWORDS ***
  DFSCM7V0 has been modified to run the LXB chain to determine
  if the current LLB exists.  If the LLB exists in the LXB chain,
  RPLECB will be updated with the Send ECB from the LXB.
  

Temporary fix

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

Comments

APAR Information

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

  PM80478

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

  UK91686

Modules/Macros

• DFSCM7V0
  

Fix information

• Fixed component name

  IMS V11

• Fixed component ID

  5635A0200

Applicable component levels

• R102 PSY UK91686

     UP13/02/20 P F302 «

Fix is available

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