IJ52265: BUG: UNABLE TO HANDLE KERNEL PAGING REQUEST IN KXGANESHA

APAR status

• Closed as program error.

Error description

• Unable to handle kernel paging request crash in kxGanesha. The
  problem happens because thevalue of fdp->fd has changed after it
  was copied it.
  

Local fix

Problem summary

• Unable to handle kernel paging request crash in kxGanesha. The
  problem happens because thevalue of fdp->fd has changed after it
  was copied it.
  

Problem conclusion

• This problem is fixed in 5.1.9.6
  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:
  The crash is fixed. The solution is to hold the rcu_read_lock
  across all access to fdp->fd protecting its value.
  
  Work Around:
  None
  
  Problem trigger:
  The problem is triggered by a race between two threads that
  happen to be accessing the fdp pointer.
  
  Symptom:
  Crash
  
  Platforms affected:
  Linux Only
  
  Functional Area affected:
  NFS Ganesha
  
  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