IV68525: BINARY HANGS WHEN READING INPUT FILE

XL Fortran for AIX Fix Pack 11 (May 2015 PTF) for 14.1
XL Fortran for AIX Fix Pack 12 (August 2015 Update) for 14.1
XL Fortran for AIX Fix Pack 15 (April 2016 Update) for 14.1
XL Fortran for AIX Fix Pack 16 (July 2016 Update) for 14.1
XL Fortran for AIX Fix Pack 17 (November 2016 Update) for 14.1
XL Fortran for AIX Fix Pack 18 (February 2017 Update) for 14.1
XL Fortran for AIX Fix Pack 19 (August 2017 Update) for 14.1
XL Fortran for AIX Fix Pack 10 (February 2015 PTF) for 14.1
XL Fortran for AIX Fix Pack 14 (December 2015 Update) for 14.1

APAR status

• Closed as program error.

Error description

• When compiling the following testcase using the compile command
  listed below, the resulting binary hangs after reading the
  first line of input from a file.
  
  ===== COMPILE COMMAND:
  xlf -o testread-xlf testread.f
  
  ===== TESTCASE:
  $ cat testread.f
        program test_read
        double precision chval
        character*8 chpar
        integer i
  
        open(9,file='input.dat')
  
        i=0
  
  10   i=i+1
        read(9,*,err=100,end=200) chpar,chval
        write(6,*) 'line:',i,' success: ',chpar,chval
  
        goto 10
  
    100 write(6,*) 'line:',i,' (read error, skipping)'
        goto 10
  
    200 write(6,*) 'EOF detected'
  
  
        end
  
  $
  
  
  ===== ACTUAL OUTPUT:
  Runtime hang of binary after reading first line of input from
  input.dat
  bgqts6fen4:bkanneth% ./testread-xlf 2>&1 | tee LOG.xlf
  line: 1  success: foo      99.0000000000000000
  //Hang
  
  
  ===== EXPECTED OUTPUT:
  Resulting binary should not hang.
  

Local fix

• N/A
  

Problem summary

• USERS AFFECTED:
  In case the user application performs a list-directed input and
  the input contains '!' in a place where a repeat count is
  expected, users may see this error.
  
  PROBLEM DESCRIPTION:
  The input operation may hang while performing a list-directed
  input and the input contains '!' in a place where a repeat
  count is expected.
  User applications may hang at runtime while performing input
  operation due to this problem.
  

Problem conclusion

• The above mentioned issue has been fixed.
  

Temporary fix

Comments

APAR Information

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

  LI78293

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

Fix information

• Fixed component name

  XL FORTRAN FOR

• Fixed component ID

  5725C7400

Applicable component levels