IJ44856: DEADLOCK WITH PCACHEHANDLERTHREAD ON LOOKUP

APAR status

• Closed as program error.

Error description

• Lookup operation found create as dependent and pushing
  create operations to be completed and it caused deadlock
  because lookup has already acquired mutex on the file
  and create tried to do stat on the same file.
  

Local fix

Problem summary

• Lookup operation found create as dependent and pushing
  create operations to be completed and it caused deadlock
  because lookup has already acquired mutex on the file
  and create tried to do stat on the same file.
  

Problem conclusion

• This problem is fixed in 5.1.6.1
  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:
  Deadlock will not happen
  Here lookup operation (without child inode) should not try
  to push create operations because of dependent operation and
  should come out.
  
  Work Around:
  None
  
  Problem trigger:
  waiters are seen and fileset is stuck to show progress
  
  Symptom:
  waiters
  
  Platforms affected:
  All Linux OS environments
  
  Functional Area affected:
  AFM-COS
  
  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