IJ44213: REMOVING FILES/DIRS IN .PTRASH DIRECTORY INSIDE AFM FILESET PATH CAN TRIGGER RECOVERY AND DEADLOCK

APAR status

• Closed as program error.

Error description

• The ptrash directory triggers recovery if the fileset is in
  dropped state. This recovery code
  tries to set the Ptrash as local
  where it tries to acquire XW lock
  on ptrash - which conflicts with
  the above operation which also holds XW lock on the ptrash
  directory while trying to queue the operation.
  

Local fix

• Make sure that ptrash directory is
  always local before performing
  any operations inside them.
  

Problem summary

• The ptrash directory triggers recovery if the fileset is in
  dropped state. This recovery code
  tries to set the Ptrash as local
  where it tries to acquire XW lock
  on ptrash - which conflicts with
  the above operation which also holds XW lock on the ptrash
  directory while trying to queue the operation.
  

Problem conclusion

• This problem is fixed in 5.1.2 PTF 8
  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:
  Avoid the deadlock caused when recovery is triggered by an
  unsuspected reset of local bit on the .ptrash directory inside
  the fileset path.
  
  Work around:
  Make sure that ptrash directory is
  always local before performing
  any operations inside them.
  
  Problem trigger:
  Remove operations performed on unwanted files inside the
  .ptrash directory when the local bit was not set on this
  directory causing recovery to be triggered.
  
  Symptom:
  deadlock
  
  Platforms affected:
  All Linux OS platforms (Serving as AFM Gateway nodes)
  
  Functional Area affected:
  AFM
  
  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