From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 07BCD3842436; Tue, 22 Sep 2020 09:38:20 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 07BCD3842436 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1600767500; bh=phaV2MhQFgbdo+aFUdQ6eSYJPMUjIUryMQXaPjaRJPw=; h=From:To:Subject:Date:In-Reply-To:References:From; b=BvnwIiHmFK0HKuZWM5dtRQ4PUyL5Q/F9QM1fx/TlEF/jI0qXDiVkvQHlEKdmUnRXg ZwI71dICi78ioDMeyGPo2+ITxYTP5+R+USK/eymrjxSxtLFsY5NZQqNdRivDVqF0yh Nnsa2oosmqHv8ydMoNJpEQEilQPNPSsmlRw1eYZc= From: "vries at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/97159] segfault in modref_may_conflict Date: Tue, 22 Sep 2020 09:38:19 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 11.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: vries 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: In-Reply-To: References: 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 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Sep 2020 09:38:20 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97159 --- Comment #1 from Tom de Vries --- Segfaults because tt is NULL: ... Program received signal SIGSEGV, Segmentation fault. 0x00000000012b1a69 in modref_may_conflict (tt=3D0x0, ref=3D0x7fffffffd8d0, tbaa_p=3Dtrue) at /home/vries/oacc/trunk/source-gcc/gcc/tree-ssa-alias.c:2433 2433 if (tt->every_base) (gdb) ... tt comes from summary->loads: ... (gdb) up #1 0x00000000012b1da1 in ref_maybe_used_by_call_p_1 (call=3D0x7ffff7ff43f0= ,=20 ref=3D0x7fffffffd8d0, tbaa_p=3Dtrue) at /home/vries/oacc/trunk/source-gcc/gcc/tree-ssa-alias.c:2513 2513 if (!modref_may_conflict (summary->loads, ref, tbaa_p= )) ... and summary looks like: ... (gdb) p *summary $2 =3D {loads =3D 0x0, stores =3D 0x0, loads_lto =3D 0x0, stores_lto =3D 0x= 0, finished =3D true} ...=