From owner-freebsd-questions@FreeBSD.ORG Mon Feb 23 01:35:53 2015 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 93F66EDD for ; Mon, 23 Feb 2015 01:35:53 +0000 (UTC) Received: from mail-ie0-x234.google.com (mail-ie0-x234.google.com [IPv6:2607:f8b0:4001:c03::234]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 5668E376 for ; Mon, 23 Feb 2015 01:35:53 +0000 (UTC) Received: by iecrp18 with SMTP id rp18so19959392iec.9 for ; Sun, 22 Feb 2015 17:35:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=HIwrDoF4DNm+h90uwS14wh4FPW4k+Y1ED/naZVsR1F8=; b=Prl5INunqJB7/5Ux/ubv0ZANudpc8QgiG1TRLEuMP3qMAU8PuoPkSRamHAeq2uckB0 Tf6TL9sEoR8kT82QWuRl5hu2fXFVgTCxngGb/aT5qoz4rdaqx9fJu0cFdOzt3UiGeuLg mlKuHOFZX4FCSxTyn0S2TOZxViQoERKI68vO7Aheqf1/PYRmfRQdQ8sj4a7qIYdV2y5p 8hlvDRO+/vScBG7b6Dv8wNy5hC/38SRoTvJz1tyXlNtRkchX/H6Y/vG0v6TD7atLWQNe /aG4wGqka3UOn4XDzTbaXi6/q/2BIZV6bHRA1ncYc/++JWfuzuyL3kTEMmhvTLEvtcn2 Cg5Q== X-Received: by 10.43.142.4 with SMTP id jg4mr9488316icc.42.1424655352728; Sun, 22 Feb 2015 17:35:52 -0800 (PST) Received: from localhost.localdomain ([50.243.6.59]) by mx.google.com with ESMTPSA id g71sm13346415ioe.43.2015.02.22.17.35.51 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 22 Feb 2015 17:35:52 -0800 (PST) Message-ID: <54EA83F2.5000103@gmail.com> Date: Sun, 22 Feb 2015 18:35:46 -0700 From: jd1008 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: freebsd-questions@freebsd.org Subject: Re: why would I get a segmentation fault on one system but not the other? References: <09da5ec0816e098badc49432c802dc18@sdf.org> <390c4c0547fc27e91d28872d29aa2e04@sdf.org> <20150222091956.fd1ec914.freebsd@edvax.de> <20150222104425.GA44573@home.parts-unknown.org> <9134.76.193.19.10.1424620110.squirrel@cosmo.uchicago.edu> <590FB195-C4E9-4D22-8900-ABE784CE9896@parts-unknown.org> <20150222205918.GA68253@home.parts-unknown.org> <11537.76.193.19.10.1424641383.squirrel@cosmo.uchicago.edu> <20150222234849.GA44067@home.parts-unknown.org> <20150223001433.GB7342@milliways> <20150223011123.GB48633@home.parts-unknown.org> In-Reply-To: <20150223011123.GB48633@home.parts-unknown.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Feb 2015 01:35:53 -0000 On 02/22/2015 06:11 PM, David Benfell wrote: > On Mon, Feb 23, 2015 at 12:14:33AM +0000, Ken Moffat wrote: > > > > Hmmm, don't know why your suggestion didn't appear. First the old > machine: > > [benfell@home ~]% grep Features /var/run/dmesg.boot > Features=0xbfebfbff > Features2=0x7fdafbbf,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > AMD Features=0x2c100800 > AMD Features2=0x21 > Structured Extended > Features=0x27ab > XSAVE Features=0x1 > Features=0xbfebfbff > Features2=0x7fdafbbf,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > AMD Features=0x2c100800 > AMD Features2=0x21 > Structured Extended > Features=0x27ab > XSAVE Features=0x1 > > Now the newer machine: > > vegan# grep Features /var/run/dmesg.boot > Features=0xbfebfbff > Features2=0x7ffafbff,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > AMD Features=0x2c100800 > AMD Features2=0x21 > Structured Extended > Features=0x27ab > XSAVE Features=0x1 > Features=0xbfebfbff > Features2=0x7ffafbff,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > AMD Features=0x2c100800 > AMD Features2=0x21 > Structured Extended > Features=0x27ab > XSAVE Features=0x1 > > This all Greek to me. Perhaps a diff will help: > > [benfell@vegan ~]% diff -u Features.home Features.vegan > --- Features.home 2015-02-22 17:09:32.000000000 -0800 > +++ Features.vegan 2015-02-22 17:09:01.000000000 -0800 > @@ -1,15 +1,13 @@ > -[benfell@home ~]% grep Features /var/run/dmesg.boot > +vegan# grep Features /var/run/dmesg.boot > Features=0xbfebfbff > - Features2=0x7fdafbbf,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > + > Features2=0x7ffafbff,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > AMD Features=0x2c100800 > AMD Features2=0x21 > - Structured Extended > -Features=0x27ab > + Structured Extended > Features=0x27ab > XSAVE Features=0x1 > Features=0xbfebfbff > - Features2=0x7fdafbbf,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > + > Features2=0x7ffafbff,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> > AMD Features=0x2c100800 > AMD Features2=0x21 > - Structured Extended > -Features=0x27ab > + Structured Extended > Features=0x27ab > XSAVE Features=0x1 > > Thanks! Well, I see this fundamental difference: ,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> >Features2=0x7fdafbbf,FMA,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2, ,MOVBE,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND> The 2nd line is lacking cpu features SMX and x2APIC I have not dabbled in compilers for many years, but one OP already mentioned the possibility of differences in AMD 64 architecture instruction generation by the C compiler.