IJ51658: SIGNAL 11 IN ACLDATAFILE::HASHINSERT

APAR status

• Closed as program error.

Error description

• Signal 11 hit in function AclDataFile::hashInsert in acl.C, due
  to race condition when adding ACLs and handling cached ACL data
  invalidation during node recovery or hitting a disk error,
  resulting in mmfsd daemon crash.
  

Local fix

• - Avoid settings ACLs to inodes
  

Problem summary

• Signal 11 hit in function AclDataFile::hashInsert in acl.C, due
  to race condition when adding ACLs and handling cached ACL data
  invalidation during node recovery or hitting a disk error,
  resulting in mmfsd daemon crash.
  

Problem conclusion

• This problem is fixed in 5.1.9.5
  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 the race condition and daemon crash are
  avoided.
  
  Work Around:
  - Avoid settings ACLs to inodes
  
  Problem trigger:
  - Setting ACLs while node recovery or a disk error happens. Node
  recovery or disk error invalidates the internal cached ACL data
  so there is a small window when setting ACLs during this time
  can cause unassigned memory access.
  
  Symptom:
  Abend/Crash
  
  Platforms affected: 
  
  All Operation System environments
  
  Functional Area affected:
  All Scale Users
  
  Customer Impact:
  Critical
  

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