IJ27144: INTERMITTENT HANG IN MMUSERAUTH WHEN RECONFIGURING OBJECT AUTHENTICATION

APAR status

• Closed as program error.

Error description

• When reconfiguring Object protocol authentication using the
  mmuserauth command, the command may occasionally hang
  while waiting for systemctl to shutdown a service.
  Looking at the process table may show systemctl
  waiting for the child process "pkttyagent" to complete.
  

Local fix

• Since the problem is intermittent,
  stopping the mmuserauth command
  and retrying it may result in the command
  successfully completing.
  

Problem summary

• When reconfiguring Object protocol authentication using the
  mmuserauth command, the command may occasionally hang
  while waiting for systemctl to shutdown a service.
  Looking at the process table may show systemctl
  waiting for the child process "pkttyagent" to complete.
  

Problem conclusion

• Benefits of the solution:
  
  This fix will prevent the hang of the pkttyagent
  command and allow the mmuserauth
  command to successfully reconfigure
  Object authentication.
  
  Work Around:
  Since the problem is intermittent,
  stopping the mmuserauth command
  and retrying it may result in the command
  successfully completing.
  
  Problem trigger:
  This issue affects customers running IBM
  Spectrum Scale with Object protocol on
  RedHat version 7 at versions 7.7 and above
  
  Symptom:
  
  Hang/Deadlock/Unresponsiveness/Long Waiters
  
  Platforms affected:
  
  RedHat version 7 at versions 7.7 and above
  
  Functional Area affected:
  Object
  
  Customer Impact:
  
  High Importance
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IJ27121

• 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