PH06947: BAD STRNCPY WITH OPT(2) AND VECTOR(AUTOSIMD) OPTIMIZATION

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When compiling with OPT(2) and VECTOR(AUTOSIMD), a strncpy()
  function call is invalid.  The issue occurs when n=0, and n is
  not a literal value.  In some cases, the initial 16-bytes of the
  destination location are overwritten incorrectly.
  

Local fix

• use ARCH(10), NOOPT, or VECTOR(NOAUTOSIMD)
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of strncpy() with n=0, when n isn't a  *
  *                 literal value, with the following compiler   *
  *                 options: ARCH(11) and up, OPT(2) and up,     *
  *                 and VECTOR(AUTOSIMD)                         *
  ****************************************************************
  * PROBLEM DESCRIPTION: When n=0, where n isn't a literal       *
  *                      value,  the initial 16-bytes of         *
  *                      destination location on the strncpy()   *
  *                      might get clobbered, when ARCH(11) and  *
  *                      up, OPT(2) and up, and                  *
  *                      VECTOR(AUTOSIMD)                        *
  *                      options are used.                       *
  ****************************************************************
  * RECOMMENDATION: install the PTF                              *
  ****************************************************************
  .
  

Problem conclusion

• corrected the issue with the compiler
  

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:

  UI63377

Modules/Macros

• CCNECICS CCNECWI  CCNED230 CCNEDSCT CCNEDWRT CCNEFILT CCNEHIFC
  CCNEIPA3 CCNEIPAO CCNEMDEP CCNEOPTP CCNEP    CCNEPP   CCNETBY
  CCNMSGE  CCNMSGT  CCNPDF23 CCNPDF24 CCNPDF25 CCNQIPA
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R7B0 PSY UI63377

     UP19/06/28 P F906

Fix is available

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