PQ99629: DEADLOCK MAY OCCUR ON RECON DATA SET IN AN ICE JOB WITH HDPC HASH POINTER CHECKER.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Deadlock may occur on RECON data set in ICE job with HDPC hash
  pointer check, because ICE and HPPC reserve the DSPURI01
  without getting control of the DSPURI02.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: IBM IMS High Performance Pointer Checker for *
  *                 z/OS Version 2 Release 1 (FMID=HPC2210)      *
  *                 users                                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: A DEADLOCK may occur on DBRC RECON      *
  *                      data sets with other IMS utilities      *
  *                      jobs. The DEADLOCK may occur under      *
  *                      one of the following conditions:        *
  *                      - Running HD Pointer Checker with a     *
  *                        stand alone job                       *
  *                      - Executing full function database HASH *
  *                        check under IMS Image Copy Extensions *
  *                        for z/OS Version 2 (FMID=H1J0210)     *
  ****************************************************************
  * RECOMMENDATION: Apply the maintenance for this APAR.         *
  ****************************************************************
  The DEADLOCK may occur on DBRC RECON data sets between an HD
  Pointer Checker job and other IMS utilities' job.
  Because HD Pointer Checker reserves the DBRC RECON data sets by
  the resource name 'DSPURI01' without request ENQ by the resource
  name 'DSPURI02'.
  
  When HD Pointer Checker finds a VSAM OPEN failure for one DBRC
  RECON data set and abends U3752 ( ABENDU3752 ), IMS BATCH
  CLEANUP Routine is scheduled and tries to ENQ the DBRC RECON
  data sets by the resource name of 'DSPURI02' for recovery and
  close the DBRC RECON data sets.
  But the other IMS utility job already ENQ the DBRC RECON data
  sets by the resource name of 'DSPURI02' and wait for reserve
  the resource name of 'DSPURI01'. HD Pointer Checker still
  reserves the DBRC RECON data sets by the resource name of
  'DSPURI01' and wait for ENQ the resource name for 'DSPURI02',
  then the DEADLOCK may occur.
  

Problem conclusion

• The macro FABUARCN has been modified following things:
  - to ENQ the resource name of 'DSPURI02' before reserve the
    resource name of 'DSPURI01' for RECONs.
  - to avoid a VSAM OPEN error for the spare RECON if the two
    other RECONs are available.
  - to return the valid IMS release level of 'COPY1' DBRC RECON
    data set.
  - to avoid a NO RECORD error for spare RECON if the two other
    RECONs are available.
  - to continue the process of ENQ and RESERVE ,even if a OBTAIN
    failure is occurred.
  
  The module FABPARCN has been reassembled.
  

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:

  UK00829

Modules/Macros

•    FABPARCN FABUARCN
  

Fix information

• Fixed component name

  IMS POINTER CHE

• Fixed component ID

  5655E0900

Applicable component levels

• R210 PSY UK00829

     UP05/02/25 P F502

Fix is available

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