From owner-freebsd-alpha Mon Mar 26 17:56:44 2001 Delivered-To: freebsd-alpha@freebsd.org Received: from meow.osd.bsdi.com (meow.osd.bsdi.com [204.216.28.88]) by hub.freebsd.org (Postfix) with ESMTP id C0D1F37B71A; Mon, 26 Mar 2001 17:56:41 -0800 (PST) (envelope-from jhb@FreeBSD.org) Received: from laptop.baldwin.cx (john@jhb-laptop.osd.bsdi.com [204.216.28.241]) by meow.osd.bsdi.com (8.11.2/8.11.2) with ESMTP id f2R1uWG33772; Mon, 26 Mar 2001 17:56:32 -0800 (PST) (envelope-from jhb@FreeBSD.org) Message-ID: X-Mailer: XFMail 1.4.0 on FreeBSD X-Priority: 3 (Normal) Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8bit MIME-Version: 1.0 In-Reply-To: Date: Mon, 26 Mar 2001 17:56:11 -0800 (PST) From: John Baldwin To: John Baldwin Subject: Re: dump(8) Cc: obrien@FreeBSD.org, alpha@FreeBSD.org, Andrew Gallatin Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On 27-Mar-01 John Baldwin wrote: > > On 27-Mar-01 Andrew Gallatin wrote: >> >> David O'Brien writes: >> > This broken dump(8) situation *must* get fixed. It is time to back out >> > commits. Does anyone have any idea what commit(s) broke dump? >> >> Nope. >> >> Its almost certainly related to the linuxthreads problem I was talking >> about last week where a userland app dies on an instruction fault >> with a PC somwhere in witness_exit(). >> >> I haven't been able to figure it out yet.. > > Try turning preemption off (i.e. remove it from the kernel config). On the > x86 > side we've seen that non-preemption safe code can blow up in very bad ways. >:( Well, I turned preemption off and the only difference it made was in the value spammed into vp->v_op: vp->v_op = 0x79e4f100df39ba4e It's not even an obvious value such as a string, but looks like pure garbage. :( Hmm, in ddb it seems that the rest of the vnode is fine, so it's just the vnode op table pointer that is hosed. -- John Baldwin -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message