PM07988: DATA FROM PDF1 GENERATED CODE OF A PARALLEL APPLICATION CAUSES PDF2 LINK TO FAIL

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Data from PDF1 generated code of a paralle application causes
  PDF2 link to fail. The problem is that PDF runtime is not
  threadsafe. This causes the value profiling mechanism to
  collect invalid values during runtime and confuses the PDF file
  reader during PDF2 compilation
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Any zOS parallel application that uses PDF   *
  *                 option.                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION: The problem is that PDF runtime is not  *
  *                      threadsafe on zOS.  This causes the     *
  *                      value profiling mechanism to collect    *
  *                      invalid values during runtime and       *
  *                      confuses the PDF file reader during     *
  *                      PDF2 compilation.                       *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  WORKAROUND:
  Turning off part or all of value profiling via -Wl,I
   ,'IPADBG(NPDFVALSPEC)' or -Wl,I,'IPADBG(NPDFPTRCALL)
   ' will prevent the problem from being exposed in the
   first place.  Customer has validated that this
  solves the problem seen.
  EXPECTED ERROR:
  Compile-time protection exception during PDF2.  Could
  also lead to runtime exception after PDF1 compilation.
  

Problem conclusion

• Use LE's compare-and-swap built-in as a locking
  mechanism to keep PDF runtime thread-safe.  Only enable
  the thread-safe mechanism when user compiles with -W
  l,I,'IPADBG(PDFTHREADEDRT)' option with -qpdf1.
  

Temporary fix

Comments

APAR Information

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

  PM02169

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

  UK54506

Modules/Macros

•    CCN$P0X  CCN$P00  CCNPDF0A CCNPDF0B CCNPDF0C
  CCNPDF0D CCNPDF0E CCNPDF0F CCNPDF00 CCNPDF01 CCNPDF02 CCNPDF03
  CCNPDF04 CCNPDF05 CCNPDF06 CCNPDF07 CCNPDF08 CCNPDF09 CCNPDF1A
  CCNPDF10 CCNPDF11 CCNPDF12 CCNPDF13 CCNPDF14 CCNPDF15 CCNPDF16
  CCNPDF17 CCNPDF18 CCNPDF19
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R760 PSY UK54506

     UP10/03/19 P F003

Fix is available

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