From owner-freebsd-ia64 Tue Jan 7 1:22:42 2003 Delivered-To: freebsd-ia64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3800937B401 for ; Tue, 7 Jan 2003 01:22:41 -0800 (PST) Received: from herring.nlsystems.com (mailgate.nlsystems.com [62.49.251.130]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7F20A43E4A for ; Tue, 7 Jan 2003 01:22:39 -0800 (PST) (envelope-from dfr@nlsystems.com) Received: from herring.nlsystems.com (herring.nlsystems.com [10.0.0.2]) by herring.nlsystems.com (8.12.6/8.12.6) with ESMTP id h079MXOR008664; Tue, 7 Jan 2003 09:22:33 GMT (envelope-from dfr@nlsystems.com) Content-Type: text/plain; charset="iso-8859-1" From: Doug Rabson To: Arun Sharma , freebsd-ia64@FreeBSD.ORG Subject: Re: unaligned fault in pmap_find_vhpt Date: Tue, 7 Jan 2003 09:22:32 +0000 User-Agent: KMail/1.4.3 References: <200301032303.gBQJBOs00863@unix-os.sc.intel.com> In-Reply-To: <200301032303.gBQJBOs00863@unix-os.sc.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Message-Id: <200301070922.32772.dfr@nlsystems.com> X-Spam-Status: No, hits=-7.7 required=6.0 tests=IN_REP_TO,QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_00_01, USER_AGENT,USER_AGENT_KMAIL version=2.41 Sender: owner-freebsd-ia64@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Friday 03 January 2003 11:03 pm, Arun Sharma wrote: > I saw a kernel mode unaligned fault during a compilation workload > yesterday on an SMP 5.0-RC1 kernel. The fault happened here: > > 0xe000000000aad660 : > > More info below. It looks like the pte_chain is getting corrupted > somehow. What is the locking scheme being used to protect pte > collision chains on an SMP kernel ? We assume that the layer above pmap deals with locking in an SMP=20 environment. Currently the VM system relies on Giant for locking but=20 this is changing gradually as Alan Cox works his way through the system=20 adding low-level locks. We ought to assert that Giant is held in the=20 vhpt updates to check this. --=20 Doug Rabson=09=09=09=09Mail: dfr@nlsystems.com =09=09=09=09=09Phone: +44 20 8348 6160 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-ia64" in the body of the message