LI75886: INCORRECT RESULT/SEGMENTATION FAULT FROM APP

January 2012 Update for XL Fortran for Linux, V12.1
January 2011 Update for XL Fortran for Linux, V12.1
June 2011 Update for XL Fortran for Linux, V12.1
XL Fortran for Linux Fix Pack 8 (January 2014 Update) for 12.1

APAR status

• Closed as program error.

Error description

• A large Fortran test case produces incorrect result compiled
  with xlf compiler.
  
  It sometimes produces segmentation fault on different machines.
  

Local fix

• In the test case,
  
  Use: asum%b = asum%b + a2%b
  instead of: asum%b(1:n_b) = asum%b(1:n_b) + a2%b(1:n_b)
  

Problem summary

• PROBLEM DESCRIPTION:
  The problem happens when the following conditions hold:
  1. There is an elemental function call and the result is of a
  derived type which contains an allocatable component.
  2. The shape of the result can not be determined at compile
  time.
  
  USERS AFFECTED:
  Users who use an elemental function returning a result
  containing allocatable components will be hit.
  

Problem conclusion

• The problem is solved. The compiler now creates a descriptor
  for the elemental function result and allocates space before
  taking the function result.
  

Temporary fix

Comments

APAR Information

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

  IZ74613

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

Fix information

• Fixed component name

  XL FORTRAN RHEL

• Fixed component ID

  5724U8410

Applicable component levels

• RC10 PSN IZ74613

     UP06/09/13