From owner-freebsd-current@FreeBSD.ORG Tue Sep 2 08:00:32 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7DF0816A4BF for ; Tue, 2 Sep 2003 08:00:32 -0700 (PDT) Received: from ftp.bjpu.edu.cn (ftp.bjpu.edu.cn [202.112.78.5]) by mx1.FreeBSD.org (Postfix) with ESMTP id 77E2743FEA for ; Tue, 2 Sep 2003 08:00:27 -0700 (PDT) (envelope-from delphij@frontfree.net) Received: by ftp.bjpu.edu.cn (Postfix, from userid 426) id 7FE97529D; Tue, 2 Sep 2003 23:00:25 +0800 (CST) Received: from srv (unknown [202.112.73.67]) by ftp.bjpu.edu.cn (Postfix) with ESMTP id 517B1529B for ; Tue, 2 Sep 2003 23:00:25 +0800 (CST) From: "=?gb2312?B?wO72zi9YaW4gTEk=?=" To: Date: Tue, 2 Sep 2003 23:00:25 +0800 Organization: Beijing University of Technology Message-ID: <00fb01c37162$f0938800$0101a8c0@srv> MIME-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal Subject: Looking for help on strange Kernel Trap 12 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 02 Sep 2003 15:00:32 -0000 Hello everyone, I am looking for help on producing a core-dump or some other solution to survive a strange kernel panic, which begins to appear from the = beginning of August, and persists in recent kernels, including the kernel made from yesterday's source. It seemed that the panic was triggered by a heavy = swap load, and I were failed to make a coredump or drop into ddb(1) because = it finally stops to respond when sync'ing buffers with another panic, = instead of rebooting or dumping. When I have cvsup'ed to the recent -CURRENT code and installed a new = kernel, it seemed to be frangible when having a heavy swap load, which results = in a kernel trap 12, which seemed to be occuring on ATA or NIC software interrupt. What's worse, the panic always triggers a more panic, the dual-panic will finally cause the system stop to respond, instead of = dump the core and restart, this generates a bit trouble for me because I can = not get access to the direct console often when I am not at the hosting = room. I think the stability, especially stability under heavy load is = important for FreeBSD, so I would like to provide some help to solve, or at least, locate the problem. I have tried to make a core dump, however I failed because the two panic simply eliminated the possiblity of giving me a = chance to fall into ddb(1). Currently I can provide the following information, and of course if = that's not enough, just fell free to write me. Software installed on the computer are: FreeBSD 5.1-CURRENT, pure-ftpd, apache2 installed from port with default options. Hardware: Pentium II-266, 64MB RAM, Intel Pro-100 NIC, ACPI enabled. The kernel configuration is tweaked, among other things, I have enabled AUTO_EOI_1, DEVICE_POLLING, and CC option -fno-builtin. Also, I have = enabled -O6 with WANT_FORCEDOWNGRADE=3D1 in /etc/make.conf, however, when I have rebuilt the system with only -O1 the problem persists. Any ideas? Thanks in advance! Cheers, Xin LI Frontfree Technology Network