invalid memory access by Fortran intrinsic date_and_time

invalid memory access by Fortran intrinsic date_and_time

Apologies if this is FAQ, but the following code when compiled with -g and -O0 has a "Invalid memory access problem" on line 4 - is there an explanation for this? I think the Fortran is kosher, and this is an intrinsic function.

program test
 implicit none
 integer :: date_values(8)
 call date_and_time(values=date_values)
 print '(a,8(i0,x))', 'date values = ', date_values
end program test

This is with composer XE update 3 and inspector XE update 2, under Fedora 13. The Memory Error Analysis preset I used was "Locate Memory Problems".

Similarly, the inspector finds an "Invalid memory access problem" on line 6 of this test program:

program test
 implicit none
 character(len=4), parameter :: var_name = 'TERM'
 character(len=11) :: var_value
 integer :: ierr
 call get_environment_variable(var_name,value=var_value,status=ierr)
 if (ierr .ne. 0) then
  print *, 'error when getting env var: ', ierr
 endif
 print '(4a)', 'environment variable ', var_name, ' = ', trim(adjustl(var_value))
end program test
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I cannot reproduce this problem. Save test case 1 to test_insp.f90, test case 2 to test_insp1.f90

[root@NHM02 problem_report]# ifort --version
ifort (IFORT) 12.0.3 20110309
Copyright (C) 1985-2011 Intel Corporation. All rights reserved.

[root@NHM02 problem_report]# ifort -g test_insp.f90 -o test_insp

[root@NHM02 problem_report]# ifort -g test_insp1.f90 -o test_insp1

[root@NHM02 problem_report]# inspxe-cl -version
Intel Inspector XE 2011 Update 1 (build 131372) Command Line tool
Copyright (C) 2009-2010 Intel Corporation. All rights reserved.

[root@NHM02 problem_report]# ifort -g test_insp.f90 -o test_insp
[root@NHM02 problem_report]# inspxe-cl -collect mi3 -- ./test_insp
Used suppression file(s): []
date values = 2011 4 25 480 15 38 44 454

0 new problem(s) found

[root@NHM02 problem_report]# inspxe-cl -collect mi3 -- ./test_insp1
Used suppression file(s): []
environment variable TERM = xterm

0 new problem(s) found

Regards, Peter

Insteresting... As you will see below, with exactly the same commands and the same versions of Composer & Inspector, I get different results. Please advise what steps to take next to debug this.

$ ifort --version
ifort (IFORT) 12.0.3 20110309
Copyright (C) 1985-2011 Intel Corporation.  All rights reserved.

$ ifort -g test_date.f90 -o test_date
$ inspxe-cl -version
Intel Inspector XE 2011 Update 1 (build 131372) Command Line tool
Copyright (C) 2009-2010 Intel Corporation. All rights reserved.
$ inspxe-cl -collect mi3 -- ./test_date
Used suppression file(s): []
date values = 2011 4 25 -240 9 47 22 60
  
1 new problem(s) found 
    1 Invalid memory access problem(s) detected 
$ ifort -g test_env.f90 -o test_env
$ inspxe-cl -collect mi3 -- ./test_env
Used suppression file(s): []
environment variable TERM = xterm
  
2 new problem(s) found 
    1 Invalid memory access problem(s) detected 
    1 Invalid partial memory access problem(s) detected 

Peter,Any news on this?On my part I have found that running Inspector as root on the same files gives different results, with only the "Invalid partial memory access" error in the test_env case. In the test_date case though, I got exactly the same output as above when running as root.It would be good to get some feedback on this.

Best Reply

The problem has been solved in latest Update 3 - please download new package from Intel Registration Center, Download Site.Regards, Peter

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