port-i386/45704: Floppy install fails to load //ffs/ffs.kmod and reboots

[jarle%uninett.no@localhost]

>Number:         45704
>Category:       port-i386
>Synopsis:       Floppy install fails to load //ffs/ffs.kmod and reboots
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Dec 10 15:50:01 +0000 2011
>Originator:     Jarle Greipsland
>Release:        NetBSD 5.99.56
>Organization:
        
>Environment:
        
        
System: NetBSD darling.urc.uninett.no 5.99.47 NetBSD 5.99.47 (DARLING) #0: Tue 
Mar 22 14:20:14 CET 2011 
jarle%darling.urc.uninett.no@localhost:/usr/obj/sys/arch/i386/compile/DARLING 
i386
Architecture: i386
Machine: i386
>Description:

I had built a -current (5.99.56) release, and tried to boot the
resulting floppy set on an old i486 system.  The boot loader read all
5 floppies, complained about failing to load ffs.kmod, and then the
system rebooted.

I chose to repeat the above scenario with a serial console, and
gathered the following log:

NetBSD floppy diskette installation
===============================================================================

ACPI should work on all modern and legacy hardware, however if you have
problems, please try disabling it.


     1. Install NetBSD
     2. Install NetBSD (no ACPI)
     3. Install NetBSD (no ACPI, no SMP)
     4. Drop to boot prompt

Choose an option; RETURN for default; SPACE to stop countdown.
Option 1 will be chosen in 0 seconds.     
11019796/
Please remove disk 1, insert disk 2, and press return...
-
Please remove disk 2, insert disk 3, and press return...
\
Please remove disk 3, insert disk 4, and press return...
+5661316|
Please remove disk 4, insert disk 5, and press return...
+427512=0x10528b0
WARNING: couldn't open ffs (//ffs/ffs.kmod)
WARNING: 1 module failed to load

A dmesg for the system in question, running 5.99.47:
Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 5.99.47 (DARLING) #0: Tue Mar 22 14:20:14 CET 2011
        
jarle%darling.urc.uninett.no@localhost:/usr/obj/sys/arch/i386/compile/DARLING
total memory = 66168 KB
avail memory = 61132 KB
timecounter: Timecounters tick every 10.000 msec
timecounter: Timecounter "i8254" frequency 1193182 Hz quality 100
Generic PC
mainbus0 (root)
cpu0 at mainbus0: Intel 486-class
eisa0 at mainbus0
isa0 at mainbus0
lpt0 at isa0 port 0x378-0x37b irq 7
aic0 at isa0 port 0x340-0x35f irq 11
scsibus0 at aic0: 8 targets, 8 luns per target
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
pckbc0 at isa0 port 0x60-0x64
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
attimer0 at isa0 port 0x40-0x43
wdc0 at isa0 port 0x1f0-0x1f7 irq 14
atabus0 at wdc0 channel 0
we0 at isa0 port 0x280-0x29f iomem 0xd0000-0xd3fff irq 9
we0: WD8013EBT Ethernet (16-bit)
we0: Ethernet address 00:00:c0:32:63:1c
vga0 at isa0 port 0x3b0-0x3df iomem 0xa0000-0xbffff
wsdisplay0 at vga0 kbdmux 1: console (80x25, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
sysbeep0 at pcppi0
npx0 at isa0 port 0xf0-0xff
npx0:  using exception 16
fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
attimer0: attached to pcppi0
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
scsibus0: waiting 2 seconds for devices to settle...
fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
IPsec: Initialized Security Association Processing.
wd0 at atabus0 drive 0
wd0: [WDC WD1200JB-00CRA1]
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 111 GB, 232581 cyl, 16 head, 63 sec, 512 bytes/sect x 234441648 sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
boot device: wd0
root on wd0a dumps on wd0b
root file system type: ffs
wsdisplay0: screen 1 added (80x25, vt100 emulation)
wsdisplay0: screen 2 added (80x25, vt100 emulation)
wsdisplay0: screen 3 added (80x25, vt100 emulation)
wsdisplay0: screen 4 added (80x25, vt100 emulation)

>How-To-Repeat:
Try and boot a -current floppy set on an old system
        
>Fix:
Unknown.
        

>Unformatted: