From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 7A3623858D1E; Wed, 17 May 2023 15:50:33 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 7A3623858D1E
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1684338633;
	bh=NJjpF+YU7E8tY4trW5ygEaYbpcpZ7OUCb5omwlX8CB4=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=tJHhPIvGuX+W2XpXAkaNW92v7f/wZH7QUFmQBXySrL8MzT5QbzJkAMVNXc6lEviJW
	 +ki3pc7VQzhIwiXejh6VlOvLDnbaWKDfnQOzviDnKuhWanAJ02ZUZT0ZxPMAmjQQqn
	 b9kO6GgwLVH9JKMp++TI2cOgpr5MJsDy5cBiAXx0=
From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/109889] [13/14 Regression] Segfault in
 __run_exit_handlers since r13-5309-gc3c6c307792026
Date: Wed, 17 May 2023 15:50:33 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-109889-4-8bTmQVda2Y@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-109889-4@http.gcc.gnu.org/bugzilla/>
References: <bug-109889-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109889

--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
When the function returns the iterator's destructor should detach itself fr=
om
the sequence's list of iterators, so that it doesn't outlive the stack frame
containing the iterator.

The commit that caused the regression included this change:

        _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(),
                              _M_message(__msg_bad_inc)
                              ._M_iterator(*this, "this"));
-       _Safe_iterator __ret =3D *this;
+       _Safe_iterator __ret(*this, _Unchecked());
        ++*this;
        return __ret;
       }

Maybe this affects how/when the __ret object gets destroyed, so it fails to
detach itself.=