IJ50321: DEADLOCK WHEN GETTING A WINDOWS SECURITY DESCRIPTOR WITH MESSAGE ?WAITING FOR EXCLUSIVE NF?? FOR THREAD INODEREVOKEWORKERTHREAD

APAR status

• Closed as program error.

Error description

• When a thread is flushing the file metadata of the ACL file to
  disk, there?s a small window that a deadlock can occur when a
  different thread tries to get a Windows security descriptor, as
  getting the security descriptor requires reading the ACL file.
  

Local fix

• - Avoid setting and getting Windows Security Descriptor at the
  same time
  - Restart GPFS
  

Problem summary

• When a thread is flushing the file metadata of the ACL file to
  disk, there?s a small window that a deadlock can occur when a
  different thread tries to get a Windows security descriptor, as
  getting the security descriptor requires reading the ACL file.
  

Problem conclusion

• This problem is fixed in 5.1.9.3
  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:
  Fixed the code so that the deadlock is avoided in this
  situation.
  
  Work Around:
  - Avoid setting and getting Windows Security Descriptor at the
  same time
  - Restart GPFS
  
  Problem trigger:
  - Make changes to Windows Security Descriptors/ACLs and ensure
  the changes go to the disk
  - Retrieve the Windows Security Descriptor of inodes
  
  Symptom:
  Hang/Deadlock/Unresponsiveness/Long Waiters
  
  Platforms affected:
  Windows
  
  Functional Area affected:
  All Scale Users
  
  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