PH13112: ABEND0C4 RC04 IN DSNGEFLC +7CDC AT UI62576 19/06/24 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABEND0C4 RC00000004 in DSNGEFLC when 2 thread attempt to
  allocate the same package at the same time.  This can create a
  race situation (a timing bug) where one each thread attempts to
  get the same package section at the same time and it creates
  a situation where the hash chain is not handled properly.
  This can result in a Db2 outage with message DSNV086E and
  an ABEND04E RC00E50705.
  

Local fix

• RESTORE PH09796/UI62576
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * Db2 12 for z/OS non-data sharing users                       *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * ABEND0C4 RC04 IN DSNGEFLC OFFSET7CDC                         *
  * when two users concurrently execute                          *
  * the same package.                                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Apply corrective PTF when available                          *
  ****************************************************************
  This APAR fixes a problem in non-data sharing environment after
  PH09796/UI62576 is applied.
  
  When two concurrent threads execute the same package, both
  threads try to load the SKPT to EDM pool.  When one thread
  finishes loading the SKPT, the other thread may incorrectly
  remove the SKPT from hash chain, and use a wrong pointer to
  insert the SKPT again, causing the above abend.  This can
  cause a secondary ABEND0C4 RC04 in DSNGEPLC OFFSET0DD6C in
  recovery process, which brings Db2 down afterwards.
  

Problem conclusion

• Db2 is changed so that SKPT is correctly loaded to EDM pool.
  The above abend problem is fixed.
  

Temporary fix

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

Comments

APAR Information

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

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

  UI64349

Modules/Macros

• DSNGEFLC DSNGERBK DSNGEPLC DSNGENER DSNGEPDL
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RC10 PSY UI64349

     UP19/07/26 P F907 ­

Fix is available

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