From owner-freebsd-toolchain@freebsd.org Sat May 6 07:06:15 2017 Return-Path: Delivered-To: freebsd-toolchain@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D2213D600F0 for ; Sat, 6 May 2017 07:06:15 +0000 (UTC) (envelope-from markmi@dsl-only.net) Received: from asp.reflexion.net (outbound-mail-210-77.reflexion.net [208.70.210.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 732081502 for ; Sat, 6 May 2017 07:06:14 +0000 (UTC) (envelope-from markmi@dsl-only.net) Received: (qmail 8925 invoked from network); 6 May 2017 07:06:07 -0000 Received: from unknown (HELO mail-cs-01.app.dca.reflexion.local) (10.81.19.1) by 0 (rfx-qmail) with SMTP; 6 May 2017 07:06:07 -0000 Received: by mail-cs-01.app.dca.reflexion.local (Reflexion email security v8.40.0) with SMTP; Sat, 06 May 2017 03:06:07 -0400 (EDT) Received: (qmail 7540 invoked from network); 6 May 2017 07:06:07 -0000 Received: from unknown (HELO iron2.pdx.net) (69.64.224.71) by 0 (rfx-qmail) with (AES256-SHA encrypted) SMTP; 6 May 2017 07:06:07 -0000 Received: from [192.168.1.106] (c-76-115-7-162.hsd1.or.comcast.net [76.115.7.162]) by iron2.pdx.net (Postfix) with ESMTPSA id 0C1FDEC7ED9; Sat, 6 May 2017 00:06:07 -0700 (PDT) From: Mark Millard Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: llvm FreeBSD powerpc ABI target bug fix: Re: [Bug 26519] Clang 4.0.0's "Target: powerpc-unknown-freebsd11.0" code generation is violating the SVR4 ABI (SEGV can result) Date: Sat, 6 May 2017 00:06:06 -0700 References: <0103401A-CEEA-4992-A45E-E60EA151119B@dsl-only.net> <893ECA11-7C80-4D24-A496-92ADC7978A07@FreeBSD.org> <8F708AD1-055E-41BD-BD92-6A87C5FBAA60@dsl-only.net> <78CD5050-2B2B-4213-AF11-7EF744F608B2@dsl-only.net> To: FreeBSD Toolchain , FreeBSD PowerPC ML In-Reply-To: Message-Id: X-Mailer: Apple Mail (2.3273) X-BeenThere: freebsd-toolchain@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Maintenance of FreeBSD's integrated toolchain List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 06 May 2017 07:06:16 -0000 On 2017-May-5, at 10:13 PM, Mark Millard wrote: > On 2017-May-5, at 6:11 PM, Mark Millard wrote: >=20 >>>> . . . >>>>=20 >>>> For the gcc 4.2.1 based kernel boot I have >>>> had one odd fatal kernel trap (0x903a64a, >>>> "unknown") where the lr showed 0x907f . It >>>> reported being stopped at: >>>>=20 >>>> ffs_truncate+0x1080 >>>>=20 >>>> It appears that "call doadump" worked but >>>> I've not looked at what was put in >>>> /var/crash/ . >>>=20 >>> If I leave the PowerMac idle running: It also happens when busy. >>> # uname -paKU >>> FreeBSD FBSDG4S 12.0-CURRENT FreeBSD 12.0-CURRENT r317820M powerpc = powerpc 1200030 1200030 >>>=20 >>> it eventually gets the same ffs_truncate-tied fatal >>> kernel trap, with the same odd lr and the like. >>>=20 >>> So, while I cannot directly cause the problem >>> at a specific time, the problem is repeatable. >>>=20 >>> . . . >>=20 >> The ffs_truncate issue is odd: >>=20 >> A) It was gcc 4.2.1 based for both kernel and world. >> B) I built a gcc 4.2.1 based debug kernel and >> installed it but that does not get the problem. >>=20 >> I sam trying the gcc 4.2.1 debug kernel with the >> system clang 4 world now and will later switch >> to the gcc 4.2.1 non-debug kernel to see what >> happens. >>=20 >> But being a pure gcc 4.2.1 environment originally >> suggests that the ffs_truncate issue is not >> clang-toolchain related. >=20 > I found a bad (old) kernel module in /boot/kernel/ > and eliminating it appears to have removed the > ffs_truncate problem. >=20 > . . . For the ffs_truncate problem I spoke too soon: It happened again, this time while the old PowerMac was busy. The detail numbers and such were again the same. =3D=3D=3D Mark Millard markmi at dsl-only.net