IJ39369: AVOID SOFT-LOCKUP WARNING WHEN THE MAXFILESTOCACHE CONFIG VALUE IS LARGE (FOR EXAMPLE 100,000,000)

APAR status

• Closed as program error.

Error description

• If maxFilesToCache config value is large
  (for example 100,000,000), iterating the whole gnode hash
  table may spend more than 22 seconds, and it causes
  Linux kernel warning message "soft lockup - CPU stuck for 22s!"
  

Local fix

• Lower the maxFilesToCache config
  

Problem summary

• If maxFilesToCache config value is large
  (for example 100,000,000), iterating the whole gnode hash
  table may spend more than 22 seconds, and it causes
  Linux kernel warning message "soft lockup - CPU stuck for 22s!"
  

Problem conclusion

• This problem is fixed in 5.1.3 PTF 1
  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:
  Avoid soft-lockup warning caused by large maxFilesToCache config
  
  Work around:
  Lower the maxFilesToCache config
  
  Problem trigger:
  Set maxFilesToCache config to large value,
  for example 100,000,000
  
  Symptom:
  Warning message
  
  Platforms affected:
  ALL Linux OS environments
  
  Functional Area affected:
  All Scale Users
  
  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