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From: "bremende55 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109633] New: segfault using cout after set with simple prog
 from cppreference.com
Date: Wed, 26 Apr 2023 14:03:22 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109633

            Bug ID: 109633
           Summary: segfault using cout after set with simple prog from
                    cppreference.com
           Product: gcc
           Version: 13.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bremende55 at gmail dot com
  Target Milestone: ---

Created attachment 54924
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54924&action=3Dedit
*ii file from compilation

Segfault with
//  from https://en.cppreference.com/w/cpp/container/set/size
#include <set>
#include <iostream>

int main()
{=20
    std::set<int> nums {1, 3, 5, 7};=20
    std::cout << "nums contains "  << nums.size() << " elements.\n";
}

compiled with
g++ -Wall -Wextra gcc13test.cpp
no compiler errors/warnings

starting a.out gives a segfault. gdb shows:

Reading symbols from a.out...
(No debugging symbols found in a.out)
(gdb) run
Starting program: /work/tmp/gcctest/a.out=20
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7d3bf5a in std::ostream::sentry::sentry(std::ostream&) () from
/lib/x86_64-linux-gnu/libstdc++.so.6
(gdb)=20


g++ -v :
Es werden eingebaute Spezifikationen verwendet.
COLLECT_GCC=3Dg++
COLLECT_LTO_WRAPPER=3D/usr/local/libexec/gcc/x86_64-pc-linux-gnu/13.1.0/lto=
-wrapper
Ziel: x86_64-pc-linux-gnu
Konfiguriert mit: ../gcc-13.1.0/configure --enable-languages=3Dc,c++
--disable-multilib
Thread-Modell: posix
Unterst=C3=BCtzte LTO-Kompressionsalgorithmen: zlib
gcc-Version 13.1.0 (GCC)


cat /etc/os-release:
PRETTY_NAME=3D"Ubuntu 22.04.2 LTS"
NAME=3D"Ubuntu"
VERSION_ID=3D"22.04"
VERSION=3D"22.04.2 LTS (Jammy Jellyfish)"
VERSION_CODENAME=3Djammy
ID=3Dubuntu
ID_LIKE=3Ddebian=