From owner-freebsd-hackers@FreeBSD.ORG Wed Aug 6 16:18:00 2014 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 01A216DE for ; Wed, 6 Aug 2014 16:18:00 +0000 (UTC) Received: from mail-ob0-x22d.google.com (mail-ob0-x22d.google.com [IPv6:2607:f8b0:4003:c01::22d]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id C159D21D8 for ; Wed, 6 Aug 2014 16:17:59 +0000 (UTC) Received: by mail-ob0-f173.google.com with SMTP id vb8so1975533obc.32 for ; Wed, 06 Aug 2014 09:17:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=ZmS6Q6Uh7+5ghz4O5OxIkhxSOaH5ig0zE40w55gBoOo=; b=w7AiaV9fxhSSaBlhiAXQVMgrEioVlQtgKZzkfbqXOeVwBv6mS4Uuzd1LuBOSBncDxV 8wwDumNDziAEOD9qim4Cyw8JnfR8MMKuWj6e9ZfHCPDTICOZOfZnpXMY8x0ni3VPmphD ppNjVESmtQGSkH8XLeIOQgTeDVESbf9Mb5agI/lo+2NSb3ugvfK1fN8pyw6wWyxXDFsO egaK3hwyAfFaQ42XWhJMP8+OE7UCuCCoWyzVPjNsVBwHrzJcD2K0ir+N8kJKMXBWVrDF GyQru8MGtEvMgX31dAIQSO+is47yLLRQoZsonSr5nAfRJzndIa5xtT5yxSv3Xk/IUpzJ FTGA== MIME-Version: 1.0 X-Received: by 10.182.125.103 with SMTP id mp7mr16797130obb.52.1407341879099; Wed, 06 Aug 2014 09:17:59 -0700 (PDT) Received: by 10.182.216.197 with HTTP; Wed, 6 Aug 2014 09:17:58 -0700 (PDT) In-Reply-To: <53E24FF0.7030305@vangyzen.net> References: <53E237B6.4040703@vangyzen.net> <20140806144833.GE15082@console-pimps.org> <53E24FF0.7030305@vangyzen.net> Date: Wed, 6 Aug 2014 18:17:58 +0200 Message-ID: Subject: Re: Sanity Check: Bogus(?) General Protection Fault From: Oliver Pinter To: Eric van Gyzen Content-Type: text/plain; charset=ISO-8859-1 Cc: freebsd-hackers@freebsd.org, Matt Fleming X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Aug 2014 16:18:00 -0000 Try to remove CPUTYPE?=foo from make.conf. On 8/6/14, Eric van Gyzen wrote: > On 08/06/2014 10:48, Matt Fleming wrote: >> On Wed, 06 Aug, at 10:12:06AM, Eric van Gyzen wrote: >>> Can someone give me a quick sanity check? I'm debugging a General >>> Protection Fault on an amd64 system. The faulting instruction appears >>> to be an immediate mov into %r11...right? I ask because I can't imagine >>> how that instruction could cause a GPF. Any ideas? >>> >>> Thanks, >>> >>> Eric >>> >>> ==== >>> >>> Fatal trap 9: general protection fault while in kernel mode >>> cpuid = 0; apic id = 00 >>> instruction pointer = 0x20:0xffffffff805d6e23 >> [...] >> >>> 0xffffffff805d6e23 : mov >>> %rcx,0x10(%r11,%r9,1) >> This is your faulting instruction. > > Thanks, Matt. That has always been my understanding (and I just found > the docs to confirm). I doubted myself because the problem is now even > more bizarre. The mov before the faulting instruction apparently didn't > complete. %r11 is still an old value, not 0x....f7a8. > > Any ideas, anyone? > > Eric > > ==== > > 0xffffffff805d6e0f : mov 0x30(%rax),%r9 > 0xffffffff805d6e13 : shr $0x15,%r9 > 0xffffffff805d6e17 : shl $0x6,%r9 > 0xffffffff805d6e1b : mov > 0xffffffff809bf7a8,%r11 > 0xffffffff805d6e23 : mov > %rcx,0x10(%r11,%r9,1) > > db> show reg > cs 0x20 > ds 0x3b > es 0x3b003b > fs 0x1b0013 > gs 0x1b > ss 0x28 > rax 0xfffff8043efd6980 > rcx 0xfffff80423501000 > rdx 0xfffff80423501000 > rbx 0xffffffffffdce222 > rsp 0xfffffe0463d45660 > rbp 0xfffffe0463d456d0 > rsi 0xffffffff80a0f898 kernel_object_store+0xb0 > rdi 0xffffffff80a0f7e8 kernel_object_store > r8 0 > r9 0x1fffff0087dc0 > r10 0 > r11 0xfffff80423501000 > r12 0xfffff80430b86980 > r13 0x707e00 > r14 0 > r15 0 > rip 0xffffffff805d6e23 vm_reserv_alloc_contig+0x3b3 > rflags 0x10206 > vm_reserv_alloc_contig+0x3b3: movq %rcx,0x10(%r11,%r9,1) > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" >