PH11373: DB2 OR IRLM ABENDS RESULTING IN SUBSYSTEM TERMINATION BECAUSE OF STORAGE OVERLAY

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DB2 may terminate after ABND=04E-00E2000D,LOC=DSNSLD1.DSNSFBK
  or IRLM may terminate with ABENDS0C4 in DXRRL400 when ECSA
  storage for Notify message gets overwritten after the request
  has been cancelled.
  Additional keywords: DB2OVRLAY/K SMCOVERLAY ZSA45
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Db2 for z/OS V11 and V12 users.              *
  ****************************************************************
  * PROBLEM DESCRIPTION: ABND=04E-00E2000D in DSNSFBK, or        *
  *                      ABENDS0C4 in DXRRL400 resulting from    *
  *                      ECSA storage overlay.                   *
  ****************************************************************
  * RECOMMENDATION: Apply corrective PTF when available.         *
  ****************************************************************
  Cancelling a thread running in Db2 which had a Notify request
  sent to IRLM, may result in common storage corruption if the
  request got suspended in IRLM. Db2 Cancel recovery code could
  return the notify message storage back to a storage pool for
  reuse while IRLM may still be processing the request and
  could end up either abending or overwriting the notify message
  storage data. This may result in other threads reusing that
  common storage to receive abends in different locations.
  
  This problem applies to Db2 threads that have been Soft
  Cancelled (i.e. ABEND04E RC00E50013) as well as those
  cancelled via a CANCEL THREAD command.
  

Problem conclusion

• This APAR closes a timing window with Notify request processing
  in IRLM and thread being cancelled. Db2 will not release the
  Notify message storage (RLPVDATA) in the cancel recovery PRR
  code if the thread was suspended in IRLM. Instead, this storage
  will be released when the thread goes through de-allocation.
  

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:

  UI64038 UI64041

Modules/Macros

•    DSNTLDU  DSNTLLDS DSNTLLOC DSNTLQRY
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RB10 PSY UI64041

     UP19/07/20 P F907

• RC10 PSY UI64038

     UP19/07/17 P F907

Fix is available

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