[Bug libgomp/71941] New: ICE with OpenMP tasks and queue

["thakkinen at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71941

            Bug ID: 71941
           Summary: ICE with OpenMP tasks and queue
           Product: gcc
           Version: 6.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: thakkinen at gmail dot com
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

Created attachment 38940
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38940&action=edit
ICE with OpenMP tasks and queue, .ii file

Hi, following dummy code causes ICE with gcc 6.1.0:

#include <omp.h>
#include <queue>
#include <string>
#include <iostream>

using namespace std;

int main(void){
    int loops=10;
    int end_flag=0;
    queue<string> testq;
    #pragma omp single
    {
        #pragma omp task
        {
            #pragma omp parallel for
            for(int i=0;i<loops;++i){
                #pragma omp critical
                testq.push("Test");
            }
            end_flag=1;
        }
        #pragma omp task
        {
            while(!end_flag){
                #pragma omp critical
                if(testq.size()>0){
                    cout << "Testq size: " << testq.size() << endl;
                }
            }
        }
    }
    return 0;
}

Compiler command and output:

$ g++ -Wall -Wextra -save-temps -fopenmp omp_task_queue.cpp
In file included from
/home/xxxxxx/gcc_61/gcc-6.1.0/include/c++/6.1.0/queue:64:0,
                 from omp_task_queue.cpp:3:
/home/xxxxxx/gcc_61/gcc-6.1.0/include/c++/6.1.0/bits/stl_queue.h: In copy
constructor ‘std::queue<std::__cxx11::basic_string<char> >::queue(const
std::queue<std::__cxx11::basic_string<char> >&)’:
/home/xxxxxx/gcc_61/gcc-6.1.0/include/c++/6.1.0/bits/stl_queue.h:96:11:
internal compiler error: in cp_genericize, at cp/cp-gimplify.c:1568
     class queue
           ^~~~~
0x6de96a cp_genericize(tree_node*)
        ../.././gcc/cp/cp-gimplify.c:1568
0x5e82d9 finish_function(int)
        ../.././gcc/cp/decl.c:14820
0x69338e synthesize_method(tree_node*)
        ../.././gcc/cp/method.c:817
0x632cc0 mark_used(tree_node*, int)
        ../.././gcc/cp/decl2.c:5251
0x5c990a build_over_call
        ../.././gcc/cp/call.c:7608
0x5c812f build_new_method_call_1
        ../.././gcc/cp/call.c:8419
0x5c812f build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
        ../.././gcc/cp/call.c:8489
0x693f5e locate_fn_flags
        ../.././gcc/cp/method.c:900
0x694126 get_copy_ctor(tree_node*, int)
        ../.././gcc/cp/method.c:958
0x6db3bb omp_cxx_notice_variable
        ../.././gcc/cp/cp-gimplify.c:908
0x6db301 omp_cxx_notice_variable
        ../.././gcc/cp/cp-gimplify.c:876
0x6dcc64 cp_genericize_r
        ../.././gcc/cp/cp-gimplify.c:1018
0xcb7713 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
        ../.././gcc/tree.c:11531
0xcb7903 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
        ../.././gcc/tree.c:11848
0xcb7903 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
        ../.././gcc/tree.c:11848
0x6dbe4e genericize_omp_for_stmt
        ../.././gcc/cp/cp-gimplify.c:388
0x6dd438 cp_genericize_r
        ../.././gcc/cp/cp-gimplify.c:1385
0xcb7713 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
        ../.././gcc/tree.c:11531
0x6dd24c cp_genericize_r
        ../.././gcc/cp/cp-gimplify.c:1222
0xcb7713 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, default_hash_traits<tree_node*> >*, tree_node*
(*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*), void*,
hash_set<tree_node*, default_hash_traits<tree_node*> >*))
        ../.././gcc/tree.c:11531
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Gcc and system specs:

$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/xxxxxx/gcc_61/gcc-6.1.0/libexec/gcc/x86_64-pc-linux-gnu/6.1.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --disable-multilib
--prefix=/home/xxxxxx/gcc_61/gcc-6.1.0 --with-gmp=/home/xxxxxx/gcc_61/gmp-6.1.0
--with-mpfr=/home/xxxxxx/gcc_61/mpfr-3.1.4
--with-mpc=/home/xxxxxx/gcc_61/mpc-1.0.3
Thread model: posix
gcc version 6.1.0 (GCC)

$ uname -a
Linux abcd.efg.hi 2.6.32-642.3.1.el6.x86_64 #1 SMP Sun Jun 26 18:16:44 EDT 2016
x86_64 x86_64 x86_64 GNU/Linux