IJ53799: PMCOLLECTOR SERVICES CRASHES WITH SEGFAULT IN LOGSTORE::READANDPROCESS()

APAR status

• Closed as program error.

Error description

• pmcollector service can segfault in LogStore::readAndProcess()
  and service will restart.There is a data race between 2 parallel
  code threads which was observed when the pmcollector aggregation
  was running (every 6h) while the node was under load.
  

Local fix

Problem summary

• pmcollector service can segfault in LogStore::readAndProcess()
  and service will restart.There is a data race between 2 parallel
  code threads which was observed when the pmcollector aggregation
  was running (every 6h) while the node was under load.
  

Problem conclusion

• This problem is fixed in 5.1.9.8
  To see all Spectrum Scale APARs and their respective
  Fix solutions refer to page: 
  https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale
  _apars.html
  
  
  Benefits of the solution:
  A restart of pmcollector service cause a loss of performance
  metrics for the time of the restart and could trigger error
  events in the GUI and mmhealth.Fixing the data race segfault
  prevents such downtime.
  
  Work Around:
  None
  
  Problem trigger:
  
  High system CPU utilization while pmcollector is processing
  it's data aggregation.
  
  Symptom:
  Abend/Crash
  
  Platforms affected:
  ALL Linux OS environments
  
  Functional Area affected:
  perfmon (Zimon)
  
  Customer Impact:
  Suggested
  

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

  SPEC SCALE STD

• Fixed component ID

  5737F33AP

Applicable component levels