Date: 02 Jun 1998 16:53:46 -0400 From: Kevin Street <street@iname.com> To: current@FreeBSD.ORG Subject: panic mounting dos floppy 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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