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Re: application crash if compiled with -fopenmp

From: Asher Langton <langton2 at llnl dot gov>
To: "Daniel Franke" <franke dot daniel at gmail dot com>
Cc: fortran at gcc dot gnu dot org
Date: Tue, 8 Jan 2008 11:48:29 -0600
Subject: Re: application crash if compiled with -fopenmp
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References: <640ad44b0801080644t25e8e7a5t7cea759da54711d6@mail.gmail.com> <640ad44b0801080930m1cef386we2471d8225e90e80@mail.gmail.com>

On Jan 8, 2008, at 11:30 AM, Daniel Franke wrote:

2008/1/8, Daniel Franke <franke.daniel@gmail.com>:
Somewhat strange problem: I have a large source file (1.2MB, 32kloc)
that compiles (and works) fine. Compiling the same source, that does
not yet contain any OMP statements, with -fopenmp, it crashes
immediately on runtime.
Some digging showed that this can be easily reproduced:
$> cat sigsegv.f90
 real(8), dimension(10000000) :: largearray
 largearray = 1.0_8
 end
$> gfortran-svn -g -Wall -fdump-tree-original sigsegv.f90 && ./a.out
[ok]
$> gfortran-svn -g -Wall -fopenmp -fdump-tree-original sigsegv.f90 && /a.out Segmentation fault

The difference: $> diff -u sigsegv.f90.003t.original sigsegv.f90.003t.original.openmp --- sigsegv.f90.003t.original 2008-01-08 18:26:15.000000000 +0100 +++ sigsegv.f90.003t.original.openmp 2008-01-08 18:25:27.000000000 +0100 @@ -1,6 +1,6 @@ MAIN__ () { - static real(kind=8) largearray[10000000]; + real(kind=8) largearray[10000000]; static integer(kind=4) options.0[7] = {68, 127, 0, 0, 0, 1, 0};

Hi Daniel,

Try adjusting the stack size (limit or ulimit; you might also want to set GOMP_STACKSIZE). With -fopenmp, arrays are now placed on the stack:

http://gcc.gnu.org/ml/fortran/2007-08/msg00442.html

-Asher

References:
- application crash if compiled with -fopenmp
  - From: Daniel Franke
- Re: application crash if compiled with -fopenmp
  - From: Daniel Franke

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