LI77122: large record in program may cause wrong output

February 2013 Update for XL Fortran for Blue Gene/Q, V14.1

APAR status

• Closed as program error.

Error description

• In 64-bit mode, if user attempts to write more than 2**31 bytes
  in a single unformatted record using the default value for the
  UWIDTH option (32), no error is emitted, and the record marker
  will overflow.
  

Local fix

• The program should be run with UWIDTH=64.  If that's done, there
  is no error and no overflow.
  

Problem summary

• In 64-bit mode, if you attempt to write more than 2**31 bytes
  in a single unformatted record using
  the default value for the UWIDTH option (32), no error is
  emitted, and the record marker will overflow.
  The cause of the problem is that with UWDITH=32, the record
  marker used by XLF is a 4 byte signed
  integer.  It therefore imposed a record limit of 2**31 - 1.
  Programs that require larger records must
  use the UWIDTH=64 option which uses 8-byte records.
  

Problem conclusion

• The problem had been fixed.
  

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:

  IV37621 LI77372

Fix information

• Fixed component name

  XL FORTRAN FOR

• Fixed component ID

  5799AH100

Applicable component levels

• RE10 PSY

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