IJ37542: ON LINUX KERNEL 3.10 OR HIGHER, O_TRUNC OPEN FLAG MAY BE IGNORED WHEN OPEN() IS INVOKED WITH THE O_CREAT FLAG

APAR status

• Closed as program error.

Error description

• On linux kernel 3.10 or higher,  if the O_TRUNC flag is
  used and the file has been opened already,
  the O_TRUNC flag may be incorrectly ignored.
  

Local fix

• Avoid using open() with O_CREAT and O_TRUNC flag
  

Problem summary

• On linux kernel 3.10 or higher,  if the O_TRUNC flag is
  used and the file has been opened already,
  the O_TRUNC flag may be incorrectly ignored.
  

Problem conclusion

• This problem is fixed in 5.1.3
  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:
  Ensure O_TRUNC flag is honored when used
  together with O_CREAT on open() calls.
  
  Work Around:
  Avoid using open() with O_CREAT and O_TRUNC flag
  
  Problem trigger:
  Using open() with O_CREAT and O_TRUNC flag on a
  system with linux kernel 3.10 or higher.
  
  Symptom:  Unexpected Results/Behavior
  
  Platforms affected:  ALL Linux OS 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