IV56705: THE LINUX OS AGENT MAY CRASH WHEN KLZ_PROCESS_CMD_SAMPLE_SECS=0 IS SET

IBM Tivoli Monitoring 6.3.0 Fix Pack 3 (6.3.0-TIV-ITM-FP0003)

APAR status

• Closed as program error.

Error description

• Abstract:
  The Linux OS agent may crash when KLZ_PROCESS_CMD_SAMPLE_SECS=0
  is set
  
  Problem:
   When KLZ_PROCESS_CMD_SAMPLE_SECS=0 is set in lz.ini the
  initialization
   of an internal variable gets skipped and this may lead to an
  incorrect
   memory free at object destructor time.
  
  Affected Platforms / Versions:
   This issue affects only the Linux OS agent at 6.30 FP2 IF2
  level.
  
  Diagnostics:
   KBB_RAS1=ERROR
  
  Example:
  /opt/IBM/ITM/lx8266/lz/bin/klzagent: free(): invalid pointer:
  0x00007f6c8800a840 ***
  ======= Backtrace: =========
  /lib64/libc.so.6(+0x76126)[0x7f6cae1ee126]
  /opt/IBM/ITM/lx8266/lz/bin/klzagent(_ZN8ProcListD1Ev+0x147)[0x50
  dea9]
  /opt/IBM/ITM/lx8266/lz/bin/klzagent(_ZN9ProcUsage6sampleEPSt3map
  Ix14Proc
  essCpuInfoSt4lessIxESaISt4pairIKxS1_EEE+0xc76)[0x517c30]
  /opt/IBM/ITM/lx8266/lz/bin/klzagent(_ZN25ProcessStatisticsTempla
  te6updat
  eESs+0x2e3)[0x52c40f]
  /opt/IBM/ITM/lx8266/lz/bin/klzagent(_Z10updateProcPv+0x139)[0x50
  d2b1]
  /lib64/libpthread.so.0(+0x7851)[0x7f6caf2f5851]
  /lib64/libc.so.6(clone+0x6d)[0x7f6cae26094d]
  
  
  Initial Impact:
   High, the agent does not start
  
  Additional Keywords:
   KLZPROC
   6.3.0.2-TIV-ITM_LINUX-IF0002
  

Local fix

• Do not set KLZ_PROCESS_CMD_SAMPLE_SECS in lz.ini file or set it
  to a non zero value.
  

Problem summary

• Monitoring Agent for Linux OS may crash when
  KLZ_PROCESS_CMD_SAMPLE_SECS=0 is configured.
  
  
  When the environment variable KLZ_PROCESS_CMD_SAMPLE_SECS=0 is
  set in the lz.ini configuration file the Monitoring Agent for
  Linux OS may crash immediately at startup with a 'free():
  invalid pointer' message in standard error.
  

Problem conclusion

• Corrected the missing initialization of an internal variable
  that led to an improper memory free and produced the crash.
  
  
  The fix for this APAR will be contained in the following
  maintenance packages:
  
  | FixPack | 6.3.0-TIV-ITM-FP0003
  

Temporary fix

• Do not set KLZ_PROCESS_CMD_SAMPLE_SECS in lz.ini file, or set it
   to a non zero value.
  

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

  ITM AGENT LINUX

• Fixed component ID

  5724C04LN

Applicable component levels

• R630 PSY

     UP

• R610 PSN

     UP

• R620 PSN

     UP

• R621 PSN

     UP

• R622 PSN

     UP

• R623 PSN

     UP