From owner-freebsd-bugs Mon Mar 24 11:30:17 2003 Delivered-To: freebsd-bugs@hub.freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 36AC537B401 for ; Mon, 24 Mar 2003 11:30:13 -0800 (PST) Received: from freefall.freebsd.org (freefall.freebsd.org [216.136.204.21]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7FAE143FDF for ; Mon, 24 Mar 2003 11:30:09 -0800 (PST) (envelope-from gnats@FreeBSD.org) Received: from freefall.freebsd.org (gnats@localhost [127.0.0.1]) by freefall.freebsd.org (8.12.6/8.12.6) with ESMTP id h2OJU8NS080181 for ; Mon, 24 Mar 2003 11:30:08 -0800 (PST) (envelope-from gnats@freefall.freebsd.org) Received: (from gnats@localhost) by freefall.freebsd.org (8.12.6/8.12.6/Submit) id h2OJU8uG080180; Mon, 24 Mar 2003 11:30:08 -0800 (PST) Date: Mon, 24 Mar 2003 11:30:08 -0800 (PST) Message-Id: <200303241930.h2OJU8uG080180@freefall.freebsd.org> To: freebsd-bugs@FreeBSD.org Cc: From: Alan Barrett Subject: Re: kern/36610: acd0: MODE_SENSE_BIG command timeout - resetting Reply-To: Alan Barrett X-Spam-Status: No, hits=0.0 required=5.0 tests=none version=2.50 X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.50 (1.173-2003-02-20-exp) Sender: owner-freebsd-bugs@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org The following reply was made to PR kern/36610; it has been noted by GNATS. From: Alan Barrett To: freebsd-gnats-submit@FreeBSD.org, pblok@inter.NL.net Cc: Subject: Re: kern/36610: acd0: MODE_SENSE_BIG command timeout - resetting Date: Mon, 24 Mar 2003 21:20:43 +0200 This problem still exists in FreeBSD-4.7-RELEASEp7, and was also present in FreeBSD-4.6-RELEASE, but was not present in FreeBSD-4.5-RELEASE. Here's what a FreeBSD-4.5 kernel says: acd0: CDROM at ata1-master using PIO4 Here's what a FreeBSD-4.7-RELEASEp7 kernel says: acd0: MODE_SENSE_BIG command timeout - resetting ata1: resetting devices .. done acd0: MODE_SENSE_BIG command timeout - resetting ata1: resetting devices .. done [repeats several times, eventually followed by a reboot] FreeBSD-4.6.2 behaved excatly like FreeBSD-4.7. I have not tried FreeBSD-current with this hardware. For comparison, here's what a NetBSD-current (NetBSD-1.6Q) kernel says: cd0 at atapibus0 drive 0: cdrom removable cd0: drive supports PIO mode 4, DMS mode 2, Ultrea-DMS mode 4 9Ultra/66) I don't know for sure, but I suspect that some CD-ROM devices do not support the ATAPI MODE_SENSE_BIG command, and that some operating systems manage to treat this failure as non-fatal. --apb (Alan Barrett) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message