OA42982: HUNG CP-CP SESSIONS AFTER AN ABEND0C4 OCCURS IN ISTLUCRP

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Hung CP-CP sessions after an ABEND0C4 occurs.  Locates hang
  and CP-CP sessions are unable to be established.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of VTAM APPC (APPC=YES on the                      *
  * VTAM APPL statement) and/or VTAM APPN                        *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * CP-CP processes hung after ABEND                             *
  * in ISTLUCRP                                                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply PTF                                                    *
  ****************************************************************
  The problem may be summarized as follows:
  1. CP-CP session initialization is started.
  2. While the Init_Other for the session is
  outstanding, an APPCB control block (NSSCB)
  is prematurely freed. (APAR OA42811 has been
  taken to address this issue.)
  3. When the Init_Other response returns, LUS references
  the freed control block.  ISTLUCSL ABENDs and then
  ISTLUCRP ABENDs.
  4. The ISTLUCRP ABEND is executing on the APPCB PAB and
  is not covered by a VTAM Recovery Routine (VRR),
  so the PAB is left undispatchable.
  5. As a result, CP-CP sessions hang and so do Locates.
  After this error occurs, no new CP-CP sessions may be
  established and no existing CP-CP sessions may be
  taken down. A D NET,CPCP display will show CP-CP
  sessions in various pending states.
  6. This APAR addresses the lack of recovery (VRR), rather
  than the issue leading up to the reported ABENDs.  The
  new recovery added by this APAR will allow VTAM to continue
  processing new CP-CP requests after these ABENDs.
  

Problem conclusion

• ISTPSCR1 is updated to provide VRR coverage around
  the call to ISTOCCSM/ISTLUCRP.
  

Temporary fix

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

Comments

APAR Information

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

  OA42764

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

Modules/Macros

• ISTPSCR1
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R210 PSY UA70316

     UP13/08/16 P F308

Fix is available

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