OA67004: MULTIPLE ABEND0C4-11 IN IGWLNDO0 AFTER CANCEL OF RLS REQUEST

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When a job or CICS region that accesses a data set in RLS is
  cancelled, and CANCEL processing itself ABENDs, a timing
  window exists that can lead to repeated ABEND0C4-11's.
  
  
  In the reported case, CICS regions were getting capped.
  Secondary ABENDs occurred due to the capped regions, which
  impacted CANCEL processing. If an RLS request ABENDs during
  the CANCEL process, specifically during unlock processing, it
  could leave behind an RLB with an RWE pointer that does not
  point to a valid RWE. This will cause 0C4 ABENDs in IGWLNDO0 if
  the pointer points to freed storage.
  
  
  KNOWN IMPACT:
  Many sysplex-wide svcdumps.
  
  ADDITIONAL SYMPTOMS:
  IGW400I
  
  COMPID=DF122,CSECT=IGWLNDO0+04FA,DATE=03/20/23,MAINTID=NONE
  NON,ABND=0C4,RC=00000000,RSN=00000011
  ABEND=40D,RC=10,COMPON=RTM2,COMPID=SCRTM,ISSUER=IEAVTRT2,MEMTERM
  - UNRECOVERABLE ABEND
  

Local fix

• Bypass/Circumvention:
  Avoid cancelling RLS requests.
  
  Recovery Action:
  If ABENDs occur, a restart of SMSVSAM is needed to clean up the
  bad RLB:
  V SMS,SMSVSAM,TERMINATESERVER
  V SMS,SMSVSAM,ACTIVE
  or
  FORCE SMSVSAM,ARM
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All VSAM RLS Users                           *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABEND0C4s occurred in IGWLNDO0 and      *
  *                      IGWLNL17 after a CANCEL of an SMSVSAM   *
  *                      R/M request experienced an ABEND        *
  *                      related to capped CICS regions.         *
  ****************************************************************
  * RECOMMENDATION: Apply PTF.                                   *
  ****************************************************************
  When an R/M request is cancelled, SMSVSAM drives unlock
  processing code which is supposed to clean up some control
  blocks used by the request. However, a timing window exists
  where if an ABEND related to capped CICS regions occurs in the
  middle of unlock processing, the aforementioned control blocks
  may not be cleaned up properly. As a result, an ABEND0C4 may
  occur in any module attempting to reference the bad control
  block.
  

Problem conclusion

• Code changed in lock request recovery processing to prevent
  referencing the control block in case an error occurs during
  a CANCEL.
  

Temporary fix

Comments

APAR Information

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

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

  UJ97313 UJ97314 UJ97315

Modules/Macros

• IGWLNDL1 IGWLNR10
  

Fix information

• Fixed component name

  VSAM REC LEV SH

• Fixed component ID

  5695DF122

Applicable component levels

• R250 PSY UJ97313

     UP25/07/02 P F507

• R310 PSY UJ97314

     UP25/07/02 P F507

• R320 PSY UJ97315

     UP25/07/02 P F507

Fix is available

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