[Bug c++/66603] New: using std::cout causes segfault with unrelated array declaration

[gunney1 at llnl dot gov]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66603

            Bug ID: 66603
           Summary: using std::cout causes segfault with unrelated array
                    declaration
           Product: gcc
           Version: 5.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gunney1 at llnl dot gov
  Target Milestone: ---

Created attachment 35816
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35816&action=edit
.ii file from g++ command

Replicator:

#include <iostream>
int main () {
   std::cout << 1;
   int a[4000000];
   // int *a = new int[8000000]; delete [] a;
}

this program segfaults with g++ (4.5.0, 4.6.1, 4.8.4, 5.1.0) but not with icpc.
Oddly, commenting out the stream insert fixes the segfault.
Replacing array with new/delete also works.
New/delete allocates more data, so memory is not the issue here.

> g++ -v -save-temps P1.C
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-5.1.0/configure
--prefix=/home/gunney1/opt/gcc/5.1.0/installed
Thread model: posix
gcc version 5.1.0 (GCC)
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'

/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/cc1plus
-E -quiet -v -D_GNU_SOURCE P1.C -mtune=generic -march=x86-64 -fpch-preprocess
-o P1.ii
ignoring nonexistent directory
"/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../x86_64-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:

/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../include/c++/5.1.0

/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../include/c++/5.1.0/x86_64-unknown-linux-gnu

/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../include/c++/5.1.0/backward

/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/include
 /usr/local/include
 /home/gunney1/opt/gcc/5.1.0/installed/include

/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/include-fixed
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'

/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/cc1plus
-fpreprocessed P1.ii -quiet -dumpbase P1.C -mtune=generic -march=x86-64
-auxbase P1 -version -o P1.s
GNU C++ (GCC) version 5.1.0 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 5.1.0, GMP version 4.3.1, MPFR version 2.4.1,
MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++ (GCC) version 5.1.0 (x86_64-unknown-linux-gnu)
        compiled by GNU C version 5.1.0, GMP version 4.3.1, MPFR version 2.4.1,
MPC version 0.8
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: a812ed01a29b2a8404e588f77961fe34
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'
 as -v --64 -o P1.o P1.s
GNU assembler version 2.20.51.0.2 (x86_64-redhat-linux) using BFD version
version 2.20.51.0.2-5.42.el6 20100205
COMPILER_PATH=/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/
LIBRARY_PATH=/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic'
'-march=x86-64'

/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/collect2
--eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2
/usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o
/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/crtbegin.o
-L/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0
-L/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../lib64
-L/lib/../lib64 -L/usr/lib/../lib64
-L/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../..
P1.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/crtend.o
/usr/lib/../lib64/crtn.o
191051 gunney1-lx~/bugrep/gcc-cout-segfault> ./a.out
Segmentation fault (core dumped)