PH26484: ABEND0C1 IN LOW CORE AT ADDRESS X'8', INCREASED CPU IN MONITOREDWORKLOADS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABEND0C1 in low core at address x'8' when QM is restarted within
  seconds after being shutdown and STAP is still activity auditing
  workloads. Increased CPU in monitored workloads after CQM is
  restarted  until workload ends.
  

Local fix

• space out Stopping and Starting CQM by at least 60 seconds.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IBM Db2 Query Monitor for z/OS      *
  ****************************************************************
  * PROBLEM DESCRIPTION: 1) ABEND0C1 after branch to offset X'8' *
  *                       from CQCMCMB1.                         *
  *                      2) ABEND0E0-29 in CQCMESC5 causing      *
  *                      recovery loop.                          *
  ****************************************************************
  * RECOMMENDATION: APPLY the PTF.                               *
  ****************************************************************
  1) ABEND0C1 during shutdown of Query Monitor when STAP is still
  active auditing.
  2) ABEND0E0-29 when running the Db2 Admin tool application.
  

Problem conclusion

• 1) There is a small time window during commit processing where
  QM will branch to offset 8 when STAP is still active. The 0C1
  abends are recovered and the SQL commit processing is not
  impacted but performance can be hindered for a brief period of
  time if the installation has a lot of commit processing.
  2) Also, recovery was entered in ARMODE and DB2 came into it's
  DSNXERT process with an ALET of 5 in access register 14.
  
  Search Keywords:
  ABEND 0C1 ABEND 0E0-29 in CQCMESC5
  

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:

  UI70580

Modules/Macros

• CQCMCMB1 CQCMCMC5 CQCMESB1 CQCMESC5
  

Fix information

• Fixed component name

  COMMON COLLECTO

• Fixed component ID

  5639OLC00

Applicable component levels

• R110 PSY UI70580

     UP20/07/17 P F007 ¢

Fix is available

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