From owner-freebsd-stable Mon Sep 18 7:50:46 2000 Delivered-To: freebsd-stable@freebsd.org Received: from thehousleys.net (frenchknot.ne.mediaone.net [24.147.224.201]) by hub.freebsd.org (Postfix) with ESMTP id 0B99E37B422 for ; Mon, 18 Sep 2000 07:50:43 -0700 (PDT) Received: from thehousleys.net (baby.int.thehousleys.net [192.168.0.24]) by thehousleys.net (8.11.0/8.11.0) with ESMTP id e8IEjRQ08774; Mon, 18 Sep 2000 10:45:27 -0400 (EDT) (envelope-from jim@thehousleys.net) Message-ID: <39C62A86.3F7108F7@thehousleys.net> Date: Mon, 18 Sep 2000 10:45:26 -0400 From: James Housley Organization: The Housleys dot Net X-Mailer: Mozilla 4.75 [en] (X11; U; Linux 2.2.12 i386) X-Accept-Language: en MIME-Version: 1.0 To: Steve Roome Cc: freebsd-stable@FreeBSD.ORG Subject: Re: Makeworld is dying... References: <39C42DF4.978A63C@urx.com> <20000917160006.D67912@wantadilla.lemis.com> <20000918154418.P8111@moose.bri.hp.com> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms191129DDB11F382503FBD719" Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG This is a cryptographically signed message in MIME format. --------------ms191129DDB11F382503FBD719 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Steve Roome wrote: > > > So could we change the text (something like, but better worded than > the following) in the FAQ, e.g. : > > Q: My programs occasionally die with Signal 11 ( or 10 ). > > A: Signal 11 errors are caused when your process has attempted to > access memory which the operating system has not granted it access > to. > > This could be caused by a number of different circumstances : > > a) Most likely, if you're developing it yourself it's buggy > code. (We've all been there!) > > b) If it's a problem with part of the base FreeBSD system, > it might be buggy code, but more often than not these problems > are found long before us general FAQ readers get to use these > bits of code. > > If these problems are only affecting you, it's probably bad > hardware. > > In the case of a) you can use a debugger and find the point > in the program which is attempting to access a bogus address > and then fix it. [ you probably already know this if you're > a programmer! ] > > In the case of b) You need to verify the settings on your > motherboard. Checking for hardware you might be running slightly > out of spec, too fast, or mismatched hardware. Often setting > memory wait states too short will trigger random signal 11's. > An overclocked CPU will possibly also exhibit strange or similar > symptoms. > > Try running some memory testing programs, or do a make buildworld > if you have the full source available for FreeBSD (after a few > successful buildworlds it's probably safe to say the hardware > is okay.). > > See the SIG11 FAQ (LINK) for more information. > > That's my idea for a rough draft anyway. I'm clearly illiterate > though, please don't flame me for that! > I like it because it also give some simple, usefully ways to verify the problem. Jim -- microsoft: "where do you want to go today?" linux: "where do you want to go tomorrow?" 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