From owner-freebsd-current@FreeBSD.ORG Sat Aug 14 14:23:58 2004 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 ED18C16A4CE for ; Sat, 14 Aug 2004 14:23:58 +0000 (GMT) Received: from imap.univie.ac.at (mail.univie.ac.at [131.130.1.27]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4C99243D45 for ; Sat, 14 Aug 2004 14:23:58 +0000 (GMT) (envelope-from le@FreeBSD.org) Received: from [192.168.0.4] (adslle.cc.univie.ac.at [131.130.102.11]) by imap.univie.ac.at (8.12.10/8.12.10) with ESMTP id i7EENiDn192104; Sat, 14 Aug 2004 16:23:46 +0200 Date: Sat, 14 Aug 2004 16:23:45 +0200 (CEST) From: Lukas Ertl To: Robert Watson In-Reply-To: Message-ID: <20040814162252.J552@korben.in.tern> References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-DCC-ZID-Univie-Metrics: mx9.univie.ac.at 4248; Body=4 Fuz1=4 Fuz2=4 cc: freebsd-current@FreeBSD.org cc: Martin Blapp Subject: Re: Deadlocks with recent SMP current 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: Sat, 14 Aug 2004 14:23:59 -0000 On Fri, 13 Aug 2004, Robert Watson wrote: > to be delivering in this hang (er, ouch). You might want to try putting a > kdb_enter() just after the T_NMI in both switch statements in trap() in > i386/i386/trap.c. This will cause the kernel to enter the debugger before > digging into the more general NMI code, which generates log messages, etc, > that may increase the chances of a problem. Even with this change I only get a 'kernel trap 19 with interrupts disabled' when sending the NMI, but no DDB prompt. cheers, le -- Lukas Ertl http://homepage.univie.ac.at/l.ertl/ le@FreeBSD.org http://people.freebsd.org/~le/