IZ76016: APPLICATION SEGFAULT WITH -O3 -Q64

November 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
November 2010 PTF for XL C Enterprise Edition for AIX, V9.0
March 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
March 2011 PTF for XL C Enterprise Edition for AIX, V9.0
July 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
December 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
March 2012 PTF for XL C Enterprise Edition for AIX, V9.0
March 2012 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
August 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
August 2010 PTF for XL C Enterprise Edition for AIX, V9.0
July 2011 PTF for XL C Enterprise Edition for AIX, V9.0
December 2011 PTF for XL C Enterprise Edition for AIX, V9.0

APAR status

• Closed as program error.

Error description

• A program consists of 2 .c files and 2 .f90 files.
  
  When one of the C files is compiled with -O3 or above,
  the application segfaults at runtime in the C file:
  
        k = FTN2C(i,j,ni);
   -->  local_min = foo[k];
  
  A modification to the type of the macro FTN2C (from int to
  unsigned int) corrects the problem.
  
  Correct:  #define FTN2C(i,j,ni) (int)((ni) * (j-1) + i-1)
  ---
  Fault: #define FTN2C(i,j,ni) (unsigned int)((ni) * (j-1) + i-1)
  
  Compiling with -O2 works fine. Compiling with -O3 -qnohot works
  fine too.
  

Local fix

• Change macro return type from int to unsign int
  

Problem summary

• PROBLEM DESCRIPTION: Incorrect transformation of addressing
  results in seg fault
  
  USERS AFFECTED: Users compiling at -O3 or above and in 64 bit
  mode
  

Problem conclusion

• The problem is fixed. Apply recommended service.
  

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:

  IZ79818 IZ80492 IZ86224 LI75802 LI75867 LI75896 LI75982 LI76003

Fix information

• Fixed component name

  XL C AIX

• Fixed component ID

  5724S7000

Applicable component levels