From owner-freebsd-bugs Fri Mar 3 21:38:00 1995 Return-Path: bugs-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id VAA15984 for bugs-outgoing; Fri, 3 Mar 1995 21:38:00 -0800 Received: from Root.COM (implode.Root.COM [198.145.90.1]) by freefall.cdrom.com (8.6.9/8.6.6) with ESMTP id VAA15977 for ; Fri, 3 Mar 1995 21:37:55 -0800 Received: from corbin.Root.COM (corbin.Root.COM [198.145.90.18]) by Root.COM (8.6.8/8.6.5) with ESMTP id VAA28163; Fri, 3 Mar 1995 21:37:43 -0800 Received: from localhost (localhost [127.0.0.1]) by corbin.Root.COM (8.6.9/8.6.5) with SMTP id VAA00259; Fri, 3 Mar 1995 21:37:43 -0800 Message-Id: <199503040537.VAA00259@corbin.Root.COM> X-Authentication-Warning: corbin.Root.COM: Host localhost didn't use HELO protocol To: ROBIN@ptnsct.nis.za (Robin Hunt) cc: bugs@FreeBSD.org Subject: Re: 16/32 meg problem In-reply-to: Your message of "Fri, 03 Mar 95 09:33:28 +0200." <950303093328.f7e3@ptnsct.nis.za> From: David Greenman Reply-To: davidg@Root.COM Date: Fri, 03 Mar 1995 21:37:41 -0800 Sender: bugs-owner@FreeBSD.org Precedence: bulk >I have previously queried this problem, but have not heard any more since >tuesday, and thought I'd re-ask: > >I have a 486DX2-80 with 16 Meg of RAM, a 2 meg caching IDE controller and it >works fine. > >Should I dare to add a further 16 meg to the machine, FreeBSD boots without any >problem - passing the memory test - but panics with the following message: > >Feb 24 17:08:17 ilink /kernel: >Feb 24 17:08:17 ilink /kernel: Fatal trap 12: page fault while in kernel mode >Feb 24 17:08:17 ilink /kernel: fault virtual address = 0x0 >Feb 24 17:08:17 ilink /kernel: fault code = supervisor read, page not present >Feb 24 17:08:17 ilink /kernel: instruction pointer = 0x8:0xf0168885 ... >f0168738 T _pmap_changebit I've looked at the code and I don't see anything obvious. It might be caused by a pmap corruption bug that we've been trying to find, but I can't tell for sure with the limited information I have. So the machine gets far enough to start up syslogd and other things? How long does it stay up before crashing? -DG