Error Segmentation Fault Fortran
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Segmentation Fault Fortran 90
Cause of Segmentation Faults SIGSEGV or SIGBUS errors Added September 29, segmentation fault fortran 77 2011 Translating...TranslateChinese SimplifiedChinese TraditionalEnglishFrenchGermanItalianPortugueseRussianSpanishTurkish This is a computer translation of the original content. It is provided
Fortran Segmentation Fault Invalid Memory Reference
for general information only and should not be relied upon as complete or accurate. Share Tweet Share Problem : When I run my code compiled fortran segmentation fault 174 with the Intel Fortran Compiler I get 'sigsegv' on linux (or sigbus on Mac OS X). This code has run fine for years on
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Segmentation Fault Gfortran
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company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join https://software.intel.com/en-us/articles/determining-root-cause-of-sigsegv-or-sigbus-errors the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Fortran 90 - “Segmentation fault - invalid memory reference” with scalable 3D array up vote 4 down vote favorite I have http://stackoverflow.com/questions/23130045/fortran-90-segmentation-fault-invalid-memory-reference-with-scalable-3d-ar compiled a fortran 90 program with gfortran which builds a scalable 3D array in a way I want. Upon running, I get the following error: Program received signal SIGSEGV: Segmentation fault - invalid memory reference. Backtrace for this error: #0 0x10542ee42 #1 0x10542f60e #2 0x7fff8d7895a9 #3 0x10542575e #4 0x105425975 #5 0x105425d0e Segmentation fault: 11 I believe this is a memory issue with the large 3D array, as it works if I decrease the dimensions, but is there anyway to get around this? Here is my code: PROGRAM phantomtest IMPLICIT NONE INTEGER, PARAMETER:: columns=34, rows=34, diags=((4*columns)-6), m=(4*columns)-6+(2*columns) REAL, ALLOCATABLE, DIMENSION(:,:,:)::phantom INTEGER :: i, j, k CHARACTER (LEN=3) :: nstring, nullstring='' ALLOCATE(phantom(columns,rows,m)) phantom=0 CALL Phantom_Making(phantom,columns,rows,diags,m) WRITE(nstring,FMT="(I3)"), columns PRINT*, nullstring DO k=1,m DO i=1,columns WRITE(*,FMT="("//nstring//"I2)") phantom(i,:,k) END DO PRINT *, nullstring END DO END PROGRAM phantomtest !--------------------------- SUBROUTINE Phantom_Making(phantom,columns,rows,diags,m) IMPLICIT NONE INTEGER, INTENT(IN):: columns, rows, diags, m REAL
Community Forums > Science Education > Homework and Coursework Questions > Engineering and Computer Science Homework > Not finding help here? Sign up for a https://www.physicsforums.com/threads/fortran-segmentation-fault.515301/ free 30min tutor trial with Chegg Tutors Dismiss Notice Dismiss Notice Join https://docs.oracle.com/cd/E19059-01/stud.9/817-6692/fortran.html Physics Forums Today! The friendliest, high quality science and math community on the planet! Everyone who loves science is here! Fortran segmentation fault Jul 19, 2011 #1 ASGtFT 1. I have a segmentation fault when I try to run a program I have written in Fortran. The compiler I segmentation fault used is gfortran. What typically causes a segmentation fault, and how do I find where the problem is? I know I should use a debugger, but I don't know which debugger I should use, how to get it, or how to use it (I don't know whether it is Fortran 95, 03 or 08--how do I find out?). ASGtFT, Jul 19, segmentation fault fortran 2011 Phys.org - latest science and technology news stories on Phys.org •Game over? Computer beats human champ in ancient Chinese game •Simplifying solar cells with a new mix of materials •Imaged 'jets' reveal cerium's post-shock inner strength Jul 19, 2011 #2 vela Staff Emeritus Science Advisor Homework Helper Education Advisor Generally, a segmentation fault is caused by trying to access a memory location you shouldn't. This can happen, for instance, if you declare an array to have 10 elements but try to access the 100th element. Debugging is a bit of an art. If the program isn't too complicated, the first thing I'd do is look carefully through the source code for obvious errors. You can also insert write statements to report the values of variables at various points in the program to make sure your algorithm is working the way you expect it to. As far as debuggers go, I can't really offer any advice as I've rarely needed to use one. Since gfortran is a Gnu product, I'd expect gdb to work with it, but a little Googling suggests th
using dbx. This chapter includes the following topics: Debugging Fortran Debugging Segmentation Faults Locating Exceptions Tracing Calls Working With Arrays Showing Intrinsic Functions Showing Complex Expressions Showing Logical Operators Viewing Fortran 95 Derived Types Pointer to Fortran 95 Derived Type Debugging Fortran The following tips and general concepts are provided to help you while debugging Fortran programs. For information on debugging Fortran OpenMP code with dbx, see Chapter 12. Current Procedure and File During a debug session, dbx defines a procedure and a source file as current. Requests to set breakpoints and to print or set variables are interpreted relative to the current function and file. Thus, stop at 5 sets different breakpoints, depending on which file is current. Uppercase Letters If your program has uppercase letters in any identifiers, dbx recognizes them. You need not provide case-sensitive or case-insensitive commands, as in some earlier versions. Fortran 95 and dbx must be in the same case-sensitive or case-insensitive mode: Compile and debug in case-insensitive mode without the -U option. The default value of the dbx input_case_sensitive environment variable is then false. If the source has a variable named LAST, then in dbx, both the print LAST or print last commands work. Fortran 95 and dbx consider LAST and last to be the same, as requested. Compile and debug in case-sensitive mode using -U. The default value of the dbx input_case_sensitive environment variable is then true. If the source has a variable named LAST and one named last, then in dbx, print LAST works, but print last does not work. Fortran 95 and dbx distinguish between LAST and last, as requested. Note - File or directory names are always case-sensitive in dbx, even if you have set the dbx input_case_sensitive environment variable to false. Sample dbx Session The following examples use a sample program called my_program. Main program for debugging, a1.f: PARAMETER ( n=2 ) REAL twobytwo(2,2) / 4 *-1 / CALL mkidentity( twobytwo, n ) PRINT *, determinant( twobytwo ) END Subroutine for debugging, a2.f: SUBROUTINE mkidentity ( array, m ) REAL array(m,m) DO 90 i = 1, m DO 20 j = 1, m IF ( i .EQ. j ) THEN array(i,j) = 1. ELSE array(i,j) = 0. END IF 20 CONTINUE 90 CONTINUE RETURN END Function for debugging, a3.f: REAL FUNCTION determinant ( a ) REAL a(2,2) determinant = a(1,1) * a(2,2) - a(1,2) / a(2,1) RETURN END 1. Compile and link with the