From owner-freebsd-bugs@FreeBSD.ORG Wed Jan 9 12:10:03 2008 Return-Path: Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 64E1716A46C for ; Wed, 9 Jan 2008 12:10:03 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (freefall.freebsd.org [IPv6:2001:4f8:fff6::28]) by mx1.freebsd.org (Postfix) with ESMTP id 4198713C47E for ; Wed, 9 Jan 2008 12:10:03 +0000 (UTC) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.14.2/8.14.2) with ESMTP id m09CA3eu009884 for ; Wed, 9 Jan 2008 12:10:03 GMT (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.14.2/8.14.1/Submit) id m09CA3Pt009883; Wed, 9 Jan 2008 12:10:03 GMT (envelope-from gnats) Resent-Date: Wed, 9 Jan 2008 12:10:03 GMT Resent-Message-Id: <200801091210.m09CA3Pt009883@freefall.freebsd.org> Resent-From: FreeBSD-gnats-submit@FreeBSD.org (GNATS Filer) Resent-To: freebsd-bugs@FreeBSD.org Resent-Reply-To: FreeBSD-gnats-submit@FreeBSD.org, Åke Wallebom Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5272F16A417 for ; Wed, 9 Jan 2008 12:07:31 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (www.freebsd.org [IPv6:2001:4f8:fff6::21]) by mx1.freebsd.org (Postfix) with ESMTP id 3D94413C43E for ; Wed, 9 Jan 2008 12:07:31 +0000 (UTC) (envelope-from nobody@FreeBSD.org) Received: from www.freebsd.org (localhost [127.0.0.1]) by www.freebsd.org (8.14.2/8.14.2) with ESMTP id m09C6QYM002728 for ; Wed, 9 Jan 2008 12:06:26 GMT (envelope-from nobody@www.freebsd.org) Received: (from nobody@localhost) by www.freebsd.org (8.14.2/8.14.1/Submit) id m09C6QeB002727; Wed, 9 Jan 2008 12:06:26 GMT (envelope-from nobody) Message-Id: <200801091206.m09C6QeB002727@www.freebsd.org> Date: Wed, 9 Jan 2008 12:06:26 GMT From: Åke Wallebom To: freebsd-gnats-submit@FreeBSD.org X-Send-Pr-Version: www-3.1 Cc: Subject: kern/119487: page fault in em taskq with polling enabled X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Jan 2008 12:10:03 -0000 >Number: 119487 >Category: kern >Synopsis: page fault in em taskq with polling enabled >Confidential: no >Severity: serious >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Jan 09 12:10:02 UTC 2008 >Closed-Date: >Last-Modified: >Originator: Åke Wallebom >Release: 7.0 RC1 >Organization: >Environment: FreeBSD dunder 7.0-RC1 FreeBSD 7.0-RC1 #2: Tue Jan 8 22:29:24 CET 2008 removed@dunder:/usr/obj/usr/src/sys/CUSTOM amd64 >Description: I got a page fault with 'current process' being 'em0 taskq' while transferring about 200 GB of data from an ftp server to my FreeBSD box via Gigabit LAN. I had compiled my kernel with DEVICE_POLLING and HZ=2000, and kern.polling.enable was set to 1 (I noticed later that this was deprecated). The files were transfered onto a ZFS pool on a GELI-device (1TB SATA2-drive). After transferring 150 GB i got the above error and the kernel panic'ed. Sadly, I can't remember the whole error message. More about the machine: Core 2 Duo E6750 4 GB RAM Three Intel PRO/1000 GT Desktop NICs (Single port cards) >How-To-Repeat: I really don't know... Hasn't happened again - but I have now recompiled the kernel with just 'POLLING' set, using default HZ now. And now i don't enable polling via sysctl but via ifconfig xxx polling. Transfered 180 GB and did not crash. So I guess I'm just reporting this as a curiosity for the em driver developer(s). >Fix: Decrease the HZ value? Set polling via ifconfig instead of kern.polling.enable? >Release-Note: >Audit-Trail: >Unformatted: