From owner-freebsd-current  Tue Jun  2 13:53:56 1998
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To: current@FreeBSD.ORG
Subject: panic mounting dos floppy
From: Kevin Street <street@iname.com>
Date: 02 Jun 1998 16:53:46 -0400
Message-ID: <87af7vmso5.fsf@kstreet.interlog.com>
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I got a mostly repeatable (4 for 5) panic today while mounting a dos 
floppy following an unsuccessful mount.  I'd accidentally done:

# mount /dev/fd0
/dev/fd0 on /mnt/unix/a: Incorrect super block. 
# mount /mnt/dos/a
 <panic>

I have the following in my /etc/fstab:
(same device, different fs types and mount points)

/dev/fd0    /mnt/unix/a     ufs     rw,noauto 0 0
/dev/fd0    /mnt/dos/a      msdos   rw,noauto,noexec 0 0

I can mount and unmount /mnt/dos/a with no problems as long as I don't
do the failing ufs type mount first.

This is on FreeBSD-current from about May 26.  
I have `options BOUNCE_BUFFERS' in the kernel.  

The panic is (this is the shortest one):

(kgdb) where
#0  boot (howto=256) at ../../kern/kern_shutdown.c:281
#1  0xf0114a26 in panic (
    fmt=0xf01ac094 "isa_dmacheck: no physical page present")
    at ../../kern/kern_shutdown.c:421
#2  0xf01ac119 in isa_dmarangecheck (
    va=0xf446b000 <Address 0xf446b000 out of bounds>, length=512, chan=2)
    at ../../i386/isa/isa.c:900
#3  0xf01abe26 in isa_dmastart (flags=537919504,
    addr=0xf446b000 <Address 0xf446b000 out of bounds>, nbytes=512, chan=2)
    at ../../i386/isa/isa.c:764
#4  0xf01aa015 in fdstate (fdcu=0, fdc=0xf0215a40) at ../../i386/isa/fd.c:1640
#5  0xf01a9acb in fdintr (fdcu=0) at ../../i386/isa/fd.c:1445
(kgdb) 

-- 
Kevin Street
street@iName.com

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