[Bug libgomp/61200] New: internal compiler error: Segmentation fault, assert & openmp

[psxlover at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61200

            Bug ID: 61200
           Summary: internal compiler error: Segmentation fault, assert &
                    openmp
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: psxlover at hotmail dot com
                CC: jakub at gcc dot gnu.org

Created attachment 32807
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32807&action=edit
Minimal test case

When trying to compile attached file with "-fopenmp" I get a segmentation
fault.
Tried with gcc 4.4.5 (on debian squeeze), 4.8.2 (on cygwin, fedora 20 and
debian wheezy) and 4.9.0 and all of them crash.

The problem occurs when there is an assert in a parallel region containing a
variable and then you have a task with that variable as share and you access it
in any way.

The problem doesn't occur if the assert is not in a "#pragma omp parallel" or
if you change he following task to parallel, or if you remove the shared
directive from the task or finally if you don't access the variable inside the
task.

The assert call can contain anything as long as it contains the variable that
is accessed later in a task.

Here is the output of "./gcc-4.9.0/bin/gcc -v -save-temps -fopenmp
fopenmpSeg.c":


Using built-in specs.
COLLECT_GCC=./gcc-4.9.0/bin/gcc
COLLECT_LTO_WRAPPER=/home/psxlover/gcc-4.9.0/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/configure
--prefix=/home/psxlover/gcc-4.9.0 --disable-multilib
Thread model: posix
gcc version 4.9.0 (GCC) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fopenmp' '-mtune=generic'
'-march=x86-64' '-pthread'
 /home/psxlover/gcc-4.9.0/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/cc1 -E
-quiet -v -D_REENTRANT fopenmpSeg.c -mtune=generic -march=x86-64 -fopenmp
-fpch-preprocess -o fopenmpSeg.i
ignoring nonexistent directory
"/home/psxlover/gcc-4.9.0/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/psxlover/gcc-4.9.0/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/include
 /usr/local/include
 /home/psxlover/gcc-4.9.0/include
 /home/psxlover/gcc-4.9.0/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-fopenmp' '-mtune=generic'
'-march=x86-64' '-pthread'
 /home/psxlover/gcc-4.9.0/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/cc1
-fpreprocessed fopenmpSeg.i -quiet -dumpbase fopenmpSeg.c -mtune=generic
-march=x86-64 -auxbase fopenmpSeg -version -fopenmp -o fopenmpSeg.s
GNU C (GCC) version 4.9.0 (x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.9.0, GMP version 4.3.2, MPFR version 2.4.2, MPC
version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C (GCC) version 4.9.0 (x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.9.0, GMP version 4.3.2, MPFR version 2.4.2, MPC
version 0.8.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 24a1e3ed1d75ecc9aae55f188f0fd7ae
fopenmpSeg.c: In function ‘main’:
fopenmpSeg.c:8:28: internal compiler error: Segmentation fault
   assert(var == 1);

                            ^
0x8e103f crash_signal
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/toplev.c:337
0x7723e1 gimplify_expr(tree_node**, gimple_statement_base**,
gimple_statement_base**, bool (*)(tree_node*), int)
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/gimplify.c:8376
0x779cd0 gimple_regimplify_operands(gimple_statement_base*,
gimple_stmt_iterator*)
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/gimplify-me.c:172
0x82853b lower_omp_1
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10139
0x82853b lower_omp
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10151
0x82cca4 lower_omp_taskreg
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:9485
0x828dfe lower_omp_1
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10016
0x828dfe lower_omp
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10151
0x8292dc lower_omp_1
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10008
0x8292dc lower_omp
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10151
0x82ad6a execute_lower_omp
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10183
0x82ad6a execute
    /home/psxlover/Downloads/gcc4.9obj/../gcc-4.9.0/gcc/omp-low.c:10222
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.