I get the following panic (hand transribed):

Fatal trap 21: FPU bounds check fault while in kernel mode
instruction pointer  = 0x8:0xc02433f5
stack pointer        = 0x10:c040fc60
frame pointer        = 0x10:c040fc7c
code segment         = base 0x0, limit 0xfffff, type 0x1b
                     = DPL 0, pres 1, def32 1, gran 1
processor eflags     = interrupt enabled, IOPL = 0
current process      = 0 (swapper)

kernel: type 21 trap, code=0
stopped at bios16+0x1b1: movl $0x16,%edx

A trace at the DB> prompt gives


I did not get a dump because a "continue" at DB> actually
permitted the machine to complete the boot process. 

Note, this panic occurs if I have hint.acpi.0.disable="1"
set in /boot/loader.conf.  The machine would not boot
with ACPI enabled in the May 2002 time frame.  If I 
comment out hint.acpi.0.disable the machine boots fine,
so it appears that ACPI can no longer be disabled.

dmesg included below.

Finally, yes I updated world, kernel, and kernel modules
with the new gcc.


Copyright (c) 1992-2002 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD 5.0-CURRENT #0: Wed May  1 16:49:56 PDT 2002
    [EMAIL PROTECTED]:/usr/obj/usr/src/sys/TROUTMASK
Preloaded elf kernel "/boot/kernel/kernel" at 0xc03d7000.
Preloaded elf module "/boot/kernel/linux.ko" at 0xc03d70a8.
Preloaded elf module "/boot/kernel/snd_pcm.ko" at 0xc03d7154.
Preloaded elf module "/boot/kernel/snd_ds1.ko" at 0xc03d7200.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc03d72ac.
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 1000041190 Hz
CPU: AMD Athlon(tm) Processor (1000.04-MHz 686-class CPU)
  Origin = "AuthenticAMD"  Id = 0x642  Stepping = 2
  AMD Features=0xc0440000<RSVD,AMIE,DSP,3DNow!>
real memory  = 402587648 (393152K bytes)
avail memory = 386912256 (377844K bytes)
Pentium Pro MTRR support enabled
VESA: v1.2, 4096k memory, flags:0x0, mode table:0xc00c1bdf (c0001bdf)
VESA: S3 Incorporated. 86C325
Using $PIR table, 9 entries at 0xc00fddd0
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <VT8371 AWRDACPI> on motherboard
acpi0: power button is handled as a fixed feature programming model.
Timecounter "ACPI-fast"  frequency 3579545 Hz
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_button0: <Power Button> on acpi0
acpi_button1: <Sleep Button> on acpi0
acpi_pcib0: <Host-PCI bridge> port 
0x6000-0x607f,0x5000-0x500f,0x4080-0x40ff,0x4000-0x407f,0xcf8-0xcff on acpi0
pci0: <PCI bus> on acpi_pcib0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
xl0: <3Com 3c905-TX Fast Etherlink XL> port 0xdc00-0xdc3f irq 11 at device 8.0 on pci0
xl0: Ethernet address: 00:60:97:98:38:65
miibus0: <MII bus> on xl0
nsphy0: <DP83840 10/100 media interface> on miibus0
nsphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
pcm0: <Yamaha DS-1E (YMF724F)> mem 0xd9000000-0xd9007fff irq 11 at device 11.0 on pci0
ahc0: <Adaptec 2940 Ultra SCSI adapter> port 0xe000-0xe0ff mem 0xd9008000-0xd9008fff 
irq 15 at device 13.0 on pci0
aic7880: Ultra Single Channel A, SCSI Id=7, 16/253 SCBs
pci0: <display, VGA> at device 17.0 (no driver attached)
atspeaker0 port 0x61 on acpi0
fdc0: <enhanced floppy controller (i82077, NE72065 or clone)> port 0x3f7,0x3f0-0x3f5 
irq 6 drq 2 on acpi0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
sio1 port 0x2f8-0x2ff irq 3 on acpi0
sio1: type 16550A
ppc0 port 0x378-0x37f irq 7 on acpi0
ppc0: Generic chipset (EPP/NIBBLE) in COMPATIBLE mode
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse, device ID 3
orm0: <Option ROMs> at iomem 0xc8000-0xcc7ff,0xc0000-0xc7fff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <8 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 10.000 msec
Waiting 15 seconds for SCSI devices to settle
acpi_cpu: CPU throttling enabled, 2 steps from 100% to 50.0%
sa0 at ahc0 bus 0 target 5 lun 0
sa0: <DEC DLT2000 8B37> Removable Sequential Access SCSI-2 device 
sa0: 5.000MB/s transfers (5.000MHz, offset 15)
cd0 at ahc0 bus 0 target 4 lun 0
cd0: <DEC RRD45   (C) DEC 1645> Removable CD-ROM SCSI-2 device 
cd0: 4.237MB/s transfers (4.237MHz, offset 15)
cd0: cd present [785028 x 512 byte records]
da2 at ahc0 bus 0 target 3 lun 0
da2: <QUANTUM LIGHTNING 730S 241E> Fixed Direct Access SCSI-2 device 
da2: 10.000MB/s transfers (10.000MHz, offset 8)
da2: 699MB (1431760 512 byte sectors: 64H 32S/T 699C)
da1 at ahc0 bus 0 target 1 lun 0
da1: <SEAGATE ST39216N 0010> Fixed Direct Access SCSI-3 device 
da1: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled
da1: 8761MB (17942584 512 byte sectors: 255H 63S/T 1116C)
Mounting root from ufs:/dev/da0s1a
cd1 at ahc0 bus 0 target 6 lun 0
cd1: <PLEXTOR CD-ROM PX-12CS 1.00> Removable CD-ROM SCSI-2 device 
cd1: 10.000MB/s transfers (10.000MHz, offset 15)
cd1: Attempt to query device size failed: NOT READY, Medium not present
da0 at ahc0 bus 0 target 0 lun 0
da0: <SEAGATE ST39216N 0010> Fixed Direct Access SCSI-3 device 
da0: 10.000MB/s transfers (10.000MHz, offset 15), Tagged Queueing Enabled
da0: 8761MB (17942584 512 byte sectors: 255H 63S/T 1116C)
WARNING: / was not properly dismounted
WARNING: /dumpdisk was not properly dismounted

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