From owner-freebsd-current@freebsd.org Wed Dec 30 14:25:34 2015 Return-Path: Delivered-To: freebsd-current@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 C4291A569A1 for ; Wed, 30 Dec 2015 14:25:34 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id A554B1C7E for ; Wed, 30 Dec 2015 14:25:34 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: by mailman.ysv.freebsd.org (Postfix) id A34D6A569A0; Wed, 30 Dec 2015 14:25:34 +0000 (UTC) Delivered-To: current@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 A2E54A5699E for ; Wed, 30 Dec 2015 14:25:34 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 3DB0A1C7B for ; Wed, 30 Dec 2015 14:25:34 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kostik@localhost [127.0.0.1]) by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id tBUEPSLu050283 (version=TLSv1 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO) for ; Wed, 30 Dec 2015 16:25:29 +0200 (EET) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua tBUEPSLu050283 Received: (from kostik@localhost) by tom.home (8.15.2/8.15.2/Submit) id tBUEPSuA050282 for current@freebsd.org; Wed, 30 Dec 2015 16:25:28 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Wed, 30 Dec 2015 16:25:28 +0200 From: Konstantin Belousov To: current@freebsd.org Subject: Re: Panic in ld_ldt() @r292914 (amd64) -- just after launching CPUs Message-ID: <20151230142528.GD3625@kib.kiev.ua> References: <20151230135407.GH1222@albert.catwhisker.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151230135407.GH1222@albert.catwhisker.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.1 X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on tom.home X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 30 Dec 2015 14:25:35 -0000 On Wed, Dec 30, 2015 at 05:54:07AM -0800, David Wolfskill wrote: > Found this on both my build machine and my laptop, each of which just > built head @r292914 (while running r292864 during the build) -- e.g.: > > FreeBSD g1-252.catwhisker.org 11.0-CURRENT FreeBSD 11.0-CURRENT #287 r292864M/292864:1100092: Tue Dec 29 05:01:42 PST 2015 root@g1-252.catwhisker.org:/common/S4/obj/usr/src/sys/CANARY amd64 > > Unfortunately, the panic occurs early enough that I can't get a crash > dump (I'm don't think the swap device has yet been discovered), and > serial console isn't working for my build machine. > > I took some screen shots of the laptop, but I don't seem to be able > to connect the phone to the laptop in a way to allow data interchange, > so I'll try to hand-transcribe the more obviously-relevant bits: > > ... > SMP: AP CPU #5 Launched! > kernel trap 9 with interrupts disabled > > Fatal trap 9: general protection fault while in kernel mode > cpuid = 6; apic id = 86 > instruction pointer = 0x28:0xffffffff80d9b505 > stack pointer = 0x28:0xfffffe06015ca8f0 > frame pointer = 0x28:0xfffffe06015ca950 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, long 1, def32 0, gran 1 > processor eflags = resume, IOPL = 0 > current process = 11 (idle: cpu6) > [ thread pid 11 tid 100010 ] > Stopped at 0xffffffff80d9b505 = ld_ldt: lldt %ax > db> bt > Tracing pid 11 tid 100010 td 0xfffff800067f69a0 > ld_ldt() at 0xffffffff80d9b505 = ld_ldt/frame 0xfffffe06015ca900 > sched_switch() at 0xffffffff80a176c5 = sched_switch+0x495/frame 0xfffffe06015ca950 > mi_switch() at 0xffffffff809f8759 = mi_switch+0x169/frame 0xfffffe06015ca980 > sched_idletd() at 0xffffffff80a1a211 = sched_idletd+0x391/frame 0xfffffe06015caa70 > fork_exit() at 0xffffffff809b5324 = fork_exit+0x84/frame 0xfffffe06015aab0 > fork_trampoline() at 0xffffffff80d9eade = fork_trampoline+0xe/frame 0xfffffe06015caab0 > --- trap 0, rip = 0, rsp = 0, rpb = 0 --- > db> > > I'm happy to try testing, but as I actually use the laptop for > day-to-day activities, I'm likely to need to do some priority-shifting. > Try clean build first. struct proc layout was changed recently, and the instruction at ld_ldt would fault if using the wrong offsets.