PK98483: KO2XSYS2+20FA ABEND0C4-4 HIGH CPU KO2ONAFB+117E ABEND0C2

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Program check LOOP ABEND0C4-4 KO2XSYS2+20FA (at PK73189 level)
  on a 5870700C (Load) instruction with R7 bad.  Omegamon was
  accessing the DB2 RMVT without first checking if z/OS DB2 was
  active.
  This occured with AUTODETECT=Y was used.  No data was displayed
  in the TEP workspaces.  Omegamon recovered from this ABEND and
  continued to drive the same code which kept ABENDing resulting
  in high CPU.
  INSPECT showed:
  -ICPU  TCB(*) HOT
   +<.:  %CPU UTILIZATION (TCB)
  |----+---20---+---40---+---60---+---80---+---100
   +  55 009C8848 KO2ACONB  98.72
  |===========================================>
  The LOOP shows up in SYSTRACE with repetitive PROGRAM CHECK
  entries and the unit of work being driven with a DSP entry for
  KO2ORCVB.  The PROGRAM CHECK can occur in KO2XSYSA (DB2 R910)
  as well as KO2XSYS2 (DB2 R810).
  Also corrected in this APAR is
  Dump Title: OMEGAMON II FOR DB2: COMPID=5655OPE00, JOB=OMEGDB2 ,
               LMOD=KOBAS510#L, CSECT=UNKNOWN , OFFSET=00D7A4
  ABEND0C2 when a 0B11 (BSM) instruction executes in KO2ONAFB+117E
  (at PK74788 level) resulting in the PSW of 077D1000 00C4411C,
  SYSTRACE showing
   008620C8 *PGM    002 077D1000 00C4411C  00040002 00000000
                                                    00104000
  Prior to the BSM executing, R1 contaied 3BC44118 and because the
  high order bit is off, the resuting AMODE of the PSW after the
  BSM is executed is 24-bit mode.  Location 00C44118 contained
  80C45458 -- a SSM (Set System Mask) instruction which is a
  privileged instruction.  This caused the ABEND0C2.  This code
  is part of the IFNODB2 routine driven if Omegamon discovers that
  z/OS DB2 is no longer operational.
  The real problem is caused because KO2ORCVB drives this routine
  from it ESPIE, an ESPIE that gets control as a result of a
  PROGRAM CHECK.  The IFNODB2 routine does not expect to be driven
  from an ESPIE and as a result of this uses an incorrect base
  register and ABENDs.  In this instance an ABEND0C2 occurred, but
  the result of this failure can be unpredictable.  ABEND0C4 and
  other ABENDs are possible.  The end result of this PROGRAM CHECK
  loop is high CPU.
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: OMEGAMON XE for DB2 PE/DB2PM                 *
  *                 users of component                           *
  *                 - OMEGAMON Server                            *
  *                 - Common Collector                           *
  *                 - Classic Interface                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: Intermittent HIGH CPU condition when    *
  *                      connected to a Remote DB2 subsystem.    *
  ****************************************************************
  * RECOMMENDATION: Apply this PTF                               *
  ****************************************************************
  PROBLEM SUMMARY:
  1. Common collector connection to a remote DB2 causes
     High CPU conditions.
  2. DB2 subsystem "not active" condition causes error
     recovery loop.
  
  PROBLEM CONCLUSION:
  1. Common Collector will not establish a remote
     DB2 connection.
  2. Correct the IFNODB2 process to properly handle a DB2 SSN
     which is currently terminating.
  

Problem conclusion

• 1. Common Collector will not establish a remote
     DB2 connection.
  2. Correct the IFNODB2 process to properly handle a DB2 SSN
     which is currently terminating.
  

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:

  PM03898 UK53147

Modules/Macros

• KO2DATA  KO2HSVPB KO2LCAPB KO2OCMCB KO2OINTB
  KO2ORCVB KO2OSNEC KO2OSNEF KO2OSNPB
  

Fix information

• Fixed component name

  OM XE DB2PE/PM

• Fixed component ID

  5655OPE00

Applicable component levels

• R410 PSY UK53147

     UP09/12/29 P F912

Fix is available

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