From owner-freebsd-bugs  Mon Oct 13 22:40:03 1997
Return-Path: <owner-freebsd-bugs>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id WAA24057
          for bugs-outgoing; Mon, 13 Oct 1997 22:40:03 -0700 (PDT)
          (envelope-from owner-freebsd-bugs)
Received: (from gnats@localhost)
          by hub.freebsd.org (8.8.7/8.8.7) id WAA24034;
          Mon, 13 Oct 1997 22:40:01 -0700 (PDT)
          (envelope-from gnats)
Resent-Date: Mon, 13 Oct 1997 22:40:01 -0700 (PDT)
Resent-Message-Id: <199710140540.WAA24034@hub.freebsd.org>
Resent-From: gnats (GNATS Management)
Resent-To: freebsd-bugs
Resent-Reply-To: FreeBSD-gnats@FreeBSD.ORG, seggers@semyam.dinoco.de
Received: from tim.xenologics.com (tim.xenologics.com [194.77.5.24])
          by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id WAA23890
          for <FreeBSD-gnats-submit@freebsd.org>; Mon, 13 Oct 1997 22:36:14 -0700 (PDT)
          (envelope-from seggers@semyam.dinoco.de)
Received: (from uucp@localhost) by tim.xenologics.com (8.8.5/8.6.6) with UUCP id HAA07497 for FreeBSD-gnats-submit@freebsd.org; Tue, 14 Oct 1997 07:35:23 +0200 (MET DST)
Received: (from seggers@localhost)
	by semyam.dinoco.de (8.8.5/8.8.5) id HAA00541;
	Tue, 14 Oct 1997 07:29:13 +0200 (CEST)
Message-Id: <199710140529.HAA00541@semyam.dinoco.de>
Date: Tue, 14 Oct 1997 07:29:13 +0200 (CEST)
From: Stefan Eggers <seggers@semyam.dinoco.de>
Reply-To: seggers@semyam.dinoco.de
To: FreeBSD-gnats-submit@FreeBSD.ORG
X-Send-Pr-Version: 3.2
Subject: i386/4760: fd0 read access panics after unsuccessfull read on it
Sender: owner-freebsd-bugs@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk


>Number:         4760
>Category:       i386
>Synopsis:       fd0 read access panics after unsuccessfull read on it
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Oct 13 22:40:00 PDT 1997
>Last-Modified:
>Originator:     Stefan Eggers
>Organization:
>Release:        FreeBSD 2.2.2-RELEASE i386
>Environment:

Happens on an 386/33 without Cache (Cache is known not to work)
with a no-name I/O and FD/HD card.  The machine has 16 MByte RAM
and just an ISA bus system.

/dev/fd0 was renamed to /dev/fd0.default and /dev/fd0.720 to
/dev/fd0 to make mtools access 720 KByte floppies.

>Description:

fd0 driver can cause kernel panic.  The message was "isa_dmastart:
channel 2 bus 4" and afterward "fatal trap 9: general protection
fault while in kernel mode" with a lot of other information which
unfortunately I don't have in electronical form, yet.

>How-To-Repeat:

Try to do "mdir A:" w/o a disk in the floppy drive.  Now insert a
propperly formatted one (I used DD as /dev/fd0 was the 720 KByte
device) and try again.  The machine paniced.

>Fix:
	

>Audit-Trail:
>Unformatted: