From owner-freebsd-bugs@freebsd.org Sat Mar 31 15:49:55 2018 Return-Path: Delivered-To: freebsd-bugs@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B25D5F6B149 for ; Sat, 31 Mar 2018 15:49:55 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4A48A691D0 for ; Sat, 31 Mar 2018 15:49:55 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 59B4E1D9CA for ; Sat, 31 Mar 2018 15:49:54 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w2VFnsZA087949 for ; Sat, 31 Mar 2018 15:49:54 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w2VFnsTu087948 for freebsd-bugs@FreeBSD.org; Sat, 31 Mar 2018 15:49:54 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 227116] CURRENT doesn't boot with integer divide fault in uma_startup_count Date: Sat, 31 Mar 2018 15:49:53 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: regression X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: kib@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org 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: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 31 Mar 2018 15:49:55 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D227116 --- Comment #11 from Konstantin Belousov --- (In reply to Konstantin Belousov from comment #8) In fact it is clear where the things get broken: UMA_SLAB_SPACE is UMA_SLAB_SIZE - sizeof(struct uma_slab) =3D=3D 3984. You have 2 14-core CPUs, hyperthreaded. This gives mp_maxid =3D 2 * 2 * 14= =3D=3D 56. Number of vm_domains is 2. Then zsize, according to gdb, is 3984. UMA_BOOT_ALIGN is 32, and roundup2(zsize, UMA_BOOT_ALIGN) is 4000. So kernel tries to calculate howmany(zones, 3984 / 4000) =3D=3D howmany(zon= es, 0).=20 If you look at the definition of howmany, you will see the division by the second arg. --=20 You are receiving this mail because: You are the assignee for the bug.=