PH37305: POTENTIAL UNDETECTED DATA CORRUPTION FOR SOME ESSL FFT SUBROUTINES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Error Description:
  -----------------
  For some transform lengths, an application using at least one
  of these ESSL FFT subroutines DCFTD, DCRFTD, DRCFTD or one of
  these Parallel ESSL FFT subroutines PDCFTD, PDCRFTD, PDRCFTD
  may experience undetected data corruption due to an incorrect
  computation.
  
  USERS AFFECTED:
  --------------
  The application will experience undetected data corruption
  provided it uses DCFTD, DRCFTD or DCRFTD with the applicable
  transform length specified in the table and
  
  *  INIT=2
     -or-
  *  At least one of the input, output or workspace arrays
      match the description in the table
     -or-
  *  The strides specified match the description in the table
  
  ESSL       | Transform |INIT |Alignment|Alignment|Strides
  Subroutine |  Lengths  |Value|of input |  of     |
  Name       |           |     |& output |workspace|
                               | arrays  | arrays  |
  DCFTD     N(1)=1600,4800
            or
            N(2)=1600,4800  2    Not 16B   Not 16B   N/A
            or
            N(3)=1600,4800
  
  DRCFTD    N(1)=3200,9600  2    Not 16B   N/A   INCX(1) ne 1
                                                  or
                                                 INCX(2) is odd
                                                  or
                                                 INCX(3) is odd
                                                  or
                                                 INCMX is odd
  
  DCRFTD    N(1)=3200,9600  2    Not 16B   N/A   INCY(1) ne 1
                                                  or
                                                 INCY(2) is odd
                                                  or
                                                 INCY(3) is odd
                                                  or
                                                 INCMY is odd
  DCRFTD    N(2)=1600,4800
  or        or              2    Not 16B   N/A       N/A
  DCRFTD    N(3)=1600,4800
  
  PROBLEM DESCRIPTION:
  --------------------
  See USERS AFFECTED section above.
  
  RECOMMENDATION:
  --------------
  Install the applicable fix as soon as it is available.
  PH37305 - IBM ESSL for AIX on Power 5.3.0.4
  

Local fix

Problem summary

• problem in ESSL FFT source was found and fixed
  

Problem conclusion

• install ESSL 5.3.0.4 for AIX
  

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:

  UI75590

Fix information

• Fixed component name

  ESSL FOR AIX

• Fixed component ID

  5765H2500

Applicable component levels

• R530 PSY UI75590

     UP21/06/10 I 1000

PTF to Fileset Mapping

• UI75590 essl.rte.smp 5.3.0.4

• UI75590 essl.rte.smp 5.3.0.4

• UI75590 essl.rte.smp 5.3.0.4