IJ47407: GSKIT ISSUE WITH AMD EPYC FAMILY 23 AND 25 PROCESSORS

APAR status

• Closed as program error.

Error description

• The newer lscpu command lists CPU family after the Model name.
  This causes the code that detects and automatically applies a
  workaround for GSKIT hangs issue does not work as expected.
  Commands like mmcrcluster or mmaddnode may hang in GSKIT layer
  on AMD EPYC family 23 and 25 processors.
  

Local fix

• Add "ICC_SHIFT=3" line in
  /usr/lpp/mmfs/lib/gsk8/C/icc/icclib/ICCSIG.txt file on problem
  nodes.
  

Problem summary

• The newer lscpu command lists CPU family after the Model name.
  This causes the code that detects and automatically applies a
  workaround for GSKIT hangs issue does not work as expected.
  Commands like mmcrcluster or mmaddnode may hang in GSKIT layer
  on AMD EPYC family 23 and 25 processors.
  

Problem conclusion

• This problem is fixed in 5.1.2.12 
  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:
  Apply the GSKIT hang workaround automatically on AMD EPYC family
  23 and 25 processors.
  
  Work Around:
  Add "ICC_SHIFT=3" line in
  /usr/lpp/mmfs/lib/gsk8/C/icc/icclib/ICCSIG.txt file on problem
  nodes.
  
  Problem trigger:
  This problem affects AMD EPYC family 23 and 25 processors
  running with newer version of lscpu command.
  
  Symptom:
  Installation and admin commands hang.
  
  Platforms affected:
  Linux OS environments
  
  Functional Area affected:
  Admin Commands, gskit
  
  Customer Impact:
  High Importance
  

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