From owner-freebsd-stable@FreeBSD.ORG Mon Apr 23 15:35:50 2007 Return-Path: X-Original-To: stable@freebsd.org Delivered-To: freebsd-stable@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 45D9616A400 for ; Mon, 23 Apr 2007 15:35:50 +0000 (UTC) (envelope-from kai@xs4all.nl) Received: from smtp-vbr6.xs4all.nl (smtp-vbr6.xs4all.nl [194.109.24.26]) by mx1.freebsd.org (Postfix) with ESMTP id D8AA313C45A for ; Mon, 23 Apr 2007 15:35:49 +0000 (UTC) (envelope-from kai@xs4all.nl) Received: from xs6.xs4all.nl (xs6.xs4all.nl [194.109.21.6]) by smtp-vbr6.xs4all.nl (8.13.8/8.13.8) with ESMTP id l3NFZmON049906 for ; Mon, 23 Apr 2007 17:35:48 +0200 (CEST) (envelope-from kai@xs4all.nl) Received: from xs6.xs4all.nl (kai@localhost [127.0.0.1]) by xs6.xs4all.nl (8.13.6/8.13.6) with ESMTP id l3NFZl0Q074517 for ; Mon, 23 Apr 2007 17:35:48 +0200 (CEST) (envelope-from kai@xs4all.nl) Received: (from kai@localhost) by xs6.xs4all.nl (8.13.6/8.13.6/Submit) id l3NFZlmI074516 for stable@freebsd.org; Mon, 23 Apr 2007 17:35:47 +0200 (CEST) (envelope-from kai) Date: Mon, 23 Apr 2007 17:35:47 +0200 From: Kai To: stable@freebsd.org Message-ID: <20070423153547.GD20155@xs4all.nl> References: <20070411105332.GC7847@xs4all.nl> <20070419123329.GA10189@xs4all.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070419123329.GA10189@xs4all.nl> User-Agent: Mutt/1.4.2.1i X-Virus: Hi! I'm a header virus! Forward this header to your friends to help me spread! X-Morphed: complete X-Virus-Scanned: by XS4ALL Virus Scanner Cc: Subject: Re: Fatal trap 12: page fault while in kernel mode X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Apr 2007 15:35:50 -0000 On Thu, Apr 19, 2007 at 02:33:29PM +0200, Kai wrote: > On Wed, Apr 11, 2007 at 12:53:32PM +0200, Kai wrote: > > > > Hello all, > > > > We're running into regular panics on our webserver after upgrading > > from 4.x to 6.2-stable: > Hi all, To continue this story, a colleague wrote a small program in C that launches 40 threads to randomly append and write to 10 files on an NFS mounted filesystem. If I keep removing the files on one of the other machines in a while loop, the first system panics: Fatal trap 12: page fault while in kernel mode cpuid = 1; apic id = 01 fault virtual address = 0x34 fault code = supervisor read, page not present instruction pointer = 0x20:0xc06bdefa stack pointer = 0x28:0xeb9f69b8 frame pointer = 0x28:0xeb9f69c4 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 73626 (nfscrash) trap number = 12 panic: page fault cpuid = 1 Uptime: 3h2m14s Sounds like a nice denial of service problem. I can hand the program to developers on request. Regards, Kai Storbeck -- This was an above the .signature production