IZ71021: UA DURING STARTUP MAY ENTER INFINITE LOOP AND LEAK MEMORY

IBM Tivoli Monitoring 6.2.2 Fix Pack 8 (6.2.2-TIV-ITM-FP0008)
IBM Tivoli Monitoring 6.2.2 Fix Pack 9 (6.2.2-TIV-ITM-FP0009)
IBM Tivoli Monitoring 6.2.2 Fix Pack 6 (6.2.2-TIV-ITM-FP0006)

APAR status

• Closed as program error.

Error description

• Severity: 1
  Approver:BEH
  Compid:  5724K1000 Tivoli Universal Agent
  Abstract:UA during startup may enter infinite loop and leak
  memory
  
  Environment:
  6.2.1, 6.2.2
  
  Problem Description:
  Universal Agent ate up memory to over 2GB immediately after UA
  starting up.
  
  Detailed Recreation Procedure:
  The detailed recreation procedure is unknown for now.
  A lot of recycling UA can cause the problem infrequently.
  
  Related Files and Output:
  When the problem occurs, the following line is outputted
  infinitely under KBB_RAS1=ERROR METRICS (UNIT:kumdcw ALL)
  (UNIT:kumdchsv DET METRICS STATE ERROR) (UNIT:kumpldsf DET)
  =======
  (4B863BE9.00C5-3:kumdchsv.cpp,5498,"DCHserver::dp_getApplNameLis
  t") Comparing DCH_dc_waitForApplNameList 2048 srcName[ASFS]
  against waiterType[2070] source[NULL]
  =======
  

Local fix

• N/A
  

Problem summary

• There is an exposure in startup processing of UA. If the UA
  thread timing occurs in a particular sequence, an infinite loop
  condition is triggered and 8 bytes of memory is allocated
  repeatedly until system's heap memory space is exhausted. UA is
  effectively disabled and cannot monitor.
  

Problem conclusion

• A statement missing from inside the loop logic was added to
  reset a flag, thereby eliminating the possible infinite loop and
  the subsequent memory leak.
  
  The fix for this APAR is included in the following maintenance
  vehicle:
      | fix pack | 6.2.1.0-TIV-ITM-FP0003
  
  Note: Search the IBM Technical support web site for maintenance
  package availability
  

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:

Fix information

• Fixed component name

  UNIVERSAL AGENT

• Fixed component ID

  5724K1000

Applicable component levels

• R621 PSY

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