From owner-freebsd-bugs Tue Dec 19 02:54:22 1995 Return-Path: owner-bugs Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id CAA07489 for bugs-outgoing; Tue, 19 Dec 1995 02:54:22 -0800 (PST) Received: from who.cdrom.com (who.cdrom.com [192.216.222.3]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id CAA07484 for ; Tue, 19 Dec 1995 02:54:17 -0800 (PST) Received: from Root.COM (implode.Root.COM [198.145.90.17]) by who.cdrom.com (8.6.12/8.6.11) with ESMTP id CAA03645 for ; Tue, 19 Dec 1995 02:54:14 -0800 Received: from corbin.Root.COM (corbin [198.145.90.50]) by Root.COM (8.6.12/8.6.5) with ESMTP id CAA02573; Tue, 19 Dec 1995 02:52:53 -0800 Received: from localhost (localhost [127.0.0.1]) by corbin.Root.COM (8.6.12/8.6.5) with SMTP id DAA00173; Tue, 19 Dec 1995 03:08:37 -0800 Message-Id: <199512191108.DAA00173@corbin.Root.COM> To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) cc: dufault@hda.com, gibbs@freefall.freebsd.org, m.sapsed@bangor.ac.uk, hm@hcs.de, freebsd-bugs@freebsd.org Subject: Re: Problem with FreeBSD 2.1.0-RELEASE In-reply-to: Your message of "Tue, 19 Dec 95 10:29:45 +0100." <199512190929.KAA02915@uriah.heep.sax.de> From: David Greenman Reply-To: davidg@Root.COM Date: Tue, 19 Dec 1995 03:07:43 -0800 Sender: owner-bugs@freebsd.org Precedence: bulk >above. I'm suspecting something with the BUFHASH() macro. Remember, >the ``fault virtual address''es are somewhat weird for all bug >reports, in this case it's 0x52. So it's not a NULL pointer, hence >not easy to check. BUFHASH will always generate a kernel VA address of some kind - by it's nature it can never return numbers near 0. bh->lh_first, however, might become bogus if a corrupted buffer is removed from the list. I don't know what else to say about this...it's going to require a competent engineer to poke around in the kernel data structures to gather clues about the bug and then carefully back-track the problem. -DG