From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 54B543857024; Wed, 6 Dec 2023 21:17:34 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 54B543857024 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1701897454; bh=cL8L8ahFgL14+hfk/ZijWEh17ur4Fik+/xUWjTOyBnk=; h=From:To:Subject:Date:In-Reply-To:References:From; b=vsY/7tgx34L3OTtQgwHodMF9hVTlxlo8He24nMDsSIDIkUFRnintuF5J3SZOJDk50 C8tu6/c+37iQECvLyTnhRrPX10BIEOyet3zO4f8/IiG7a7BFaPwgEiXt99vyGsqelU 0W3mhnZnXTCRXezoAuIOscgf8RKbnFunJuN/OvfM= From: "dmalcolm at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug analyzer/112889] ICE with -fanalyzer seen on Linux kernel drivers/infiniband/hw/cxgb4/cm.c Date: Wed, 06 Dec 2023 21:17:34 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: analyzer X-Bugzilla-Version: unknown X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dmalcolm at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: dmalcolm at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status everconfirmed cf_reconfirmed_on 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112889 David Malcolm changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Ever confirmed|0 |1 Last reconfirmed| |2023-12-06 --- Comment #1 from David Malcolm --- Happens for a concrete_binding 2 bits below the start of the base region, d= ue to: 172 bool ins =3D Traits::is_empty (*e); 173 if (ins) 174 { 175 e->m_key =3D k; 176 new ((void *)&e->m_value) Value (v); 177 gcc_checking_assert (!Traits::is_empty (*e) 178 && !Traits::is_deleted (*e)); 179 } (gdb) call b.dump(true) start: -2, size: 1, next: -1 (gdb) p k.is_empty() $6 =3D true (gdb) p k.is_deleted() $7 =3D false where concrete_binding has: void mark_deleted () { m_bit_range.m_start_bit_offset =3D -1; } void mark_empty () { m_bit_range.m_start_bit_offset =3D -2; } bool is_deleted () const { return m_bit_range.m_start_bit_offset =3D=3D -= 1; } bool is_empty () const { return m_bit_range.m_start_bit_offset =3D=3D -2;= } Possibly also affects the "1 bit before the base region" case as well. Working on a fix to use the size field for the deleted/empty values. It's a failing assertion, so may well be present (but latent) in older releases.=