[Bug c/53580] New: Internal Segmentation fault in nested "omp parallel", "omp parallel for" and "omp parallel for reduction" Directives

[fedediazceo at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53580

             Bug #: 53580
           Summary: Internal Segmentation fault in nested "omp parallel",
                    "omp parallel for" and "omp parallel for reduction"
                    Directives
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: fedediazceo@gmail.com


Created attachment 27559
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27559
Attached preprocesses source that the output demands

When trying to compile nested #pragma omp parallel, #pragma omp parallel for
and #pragma omp parallel for reduction (+:variable), the compiler throws an
internal error:segmentation fault.

--------test code------- 

#include <stdio.h>
#include <omp.h>


int main(int argc, char **argv){
    int x, y, variableReduction=0;

    #pragma omp parallel    

    #pragma omp for
    for(x=0; x <= 10 ; x++){
        #pragma omp for reduction(+: variableReduction)
        for(y=0; y <= 10 ; y++){
            variableReduction += 0;
        }
    }
    return variableReduction;
}-----------------------


gcc -v
Using internal specifications.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object
--enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686
--with-tune=generic --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) 

The command line arguments and the output is:

gcc -Wall -Wextra -fopenmp test.c -o test

test.c:12:9: warning: work-sharing region may not be closely nested inside of
work-sharing, critical, ordered, master or explicit task region [enabled by
default]
test.c:12:9: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
Preprocessed source stored into /tmp/cck4oOHH.out file, please attach this to
your bugreport.

Somewhat similar to Bug report 35674
(http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35674) but different compiler
context (i think)

Hope it's clear enough, my first bug report :-)