I've found reliable way to crash my box, install latest vim6h alpha and
set it to your default editor for mutt, I'm using 1.2.5i. Then write
something and try to save it :wq

panic: Filesystem goof
mp_lock = 00000001 ; cpuid = 0 ; lapic.id = 00000000

At this point I can type and symbols appear on the console, but system
is completely dead, do not respond to ping etc.
Here's what my machine looks like, sources are from Sep 5 17:19 UTC.

Copyright (c) 1992-2000 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: Tue Sep  5 21:36:04 EET 2000
    [EMAIL PROTECTED]:/usr/src/sys/compile/Myhakas
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium III/Pentium III Xeon/Celeron (501.14-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x672  Stepping = 2
real memory  = 268435456 (262144K bytes)
avail memory = 257568768 (251532K bytes)
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
FreeBSD/SMP: Multiprocessor motherboard
 cpu0 (BSP): apic id:  0, version: 0x00040011, at 0xfee00000
 cpu1 (AP):  apic id:  1, version: 0x00040011, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00170011, at 0xfec00000
Preloaded elf kernel "kernel" at 0xc0387000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc038709c.
Pentium Pro MTRR support enabled
VESA: v2.0, 32768k memory, flags:0x1, mode table:0xc00c6954 (c0006954)
VESA: Matrox Graphics Inc.
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Intel 82443GX host to PCI bridge> on motherboard
pci0: <PCI bus> on pcib0
pcib1: <Intel 82443GX (440 GX) PCI-PCI (AGP) bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <Matrox MGA G400 AGP graphics accelerator> at 0.0 irq 16
isab0: <Intel 82371AB PCI to ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xffa0-0xffaf at device 7.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <Intel 82371AB/EB (PIIX4) USB controller> at 7.2
Timecounter "PIIX"  frequency 3579545 Hz
pci0: <Intel 82371AB Power management controller> at 7.3
ahc0: <Adaptec aic7896/97 Ultra2 SCSI adapter> port 0xe400-0xe4ff mem 
0xfebfe000-0xfebfefff irq 16 at device 11.0 on pci0
ahc0: aic7896/97 Wide Channel A, SCSI Id=7, 32/255 SCBs
ahc1: <Adaptec aic7896/97 Ultra2 SCSI adapter> port 0xe800-0xe8ff mem 
0xfebff000-0xfebfffff irq 16 at device 11.1 on pci0
ahc1: aic7896/97 Wide Channel B, SCSI Id=7, 32/255 SCBs
pcm0: <AudioPCI ES1371> port 0xef00-0xef3f irq 18 at device 12.0 on pci0
fxp0: <Intel Pro 10/100B/100+ Ethernet> port 0xee80-0xeebf mem 
0xfea00000-0xfeafffff,0xfebfd000-0xfebfdfff irq 19 at device 13.0 on pci0
fxp0: Ethernet address 00:e0:81:10:50:32
fxp1: <Intel Pro 10/100B/100+ Ethernet> port 0xed80-0xedbf mem 
0xfe800000-0xfe8fffff,0xfebfc000-0xfebfcfff irq 17 at device 15.0 on pci0
fxp1: Ethernet address 00:90:27:54:57:26
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model Generic PS/2 mouse, device ID 0
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <9 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0303> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0501> can't assign resources
unknown: <PNP0700> can't assign resources
unknown: <PNP0f13> can't assign resources
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
BRIDGE 990810, have 3 interfaces
-- index 1  type 6 phy 0 addrl 6 addr 00.e0.
-- index 2  type 6 phy 0 addrl 6 addr
SMP: AP CPU #1 Launched!
ad0: 14649MB <IBM-DTLA-307015> [29765/16/63] at ata0-master using UDMA33
ad1: 35772MB <IBM-DPTA-353750> [72680/16/63] at ata1-master using UDMA33
Waiting 5 seconds for SCSI devices to settle
da0 at ahc0 bus 0 target 1 lun 0
da0: <QUANTUM VIKING II 4.5WSE 5520> Fixed Direct Access SCSI-2 device 
da0: 40.000MB/s transfers (20.000MHz, offset 31, 16bit)
da0: 4350MB (8910423 512 byte sectors: 255H 63S/T 554C)
da1 at ahc0 bus 0 target 2 lun 0
da1: <QUANTUM VIKING II 4.5WSE 5520> Fixed Direct Access SCSI-2 device 
da1: 40.000MB/s transfers (20.000MHz, offset 31, 16bit)
da1: 4350MB (8910423 512 byte sectors: 255H 63S/T 554C)
Mounting root from ufs:/dev/da0s1a
cd0 at ahc1 bus 0 target 0 lun 0
cd0: <TOSHIBA CD-ROM XM-6201TA 1030> Removable CD-ROM SCSI-2 device 
cd0: 10.000MB/s transfers (10.000MHz, offset 16)
cd0: Attempt to query device size failed: NOT READY, Medium not present
da2 at ahc1 bus 0 target 1 lun 0
da2: <QUANTUM FIREBALL_TM3200S 300X> Fixed Direct Access SCSI-2 device 
da2: 20.000MB/s transfers (20.000MHz, offset 15)
da2: 3067MB (6281856 512 byte sectors: 255H 63S/T 391C)
WARNING: / was not properly dismounted

# Myhakas

machine         i386
ident           Myhakas
maxusers        64
makeoptions     CONF_CFLAGS=-fno-builtin  #Don't allow use of memcmp, etc.
makeoptions     DEBUG=-g                #Build kernel with gdb(1) debug symbols
options         PQ_CACHESIZE=512        # color for 512k/16k cache
options         SMP                     # Symmetric MultiProcessor Kernel
options         APIC_IO                 # Symmetric (APIC) I/O
cpu             I686_CPU                # aka Pentium Pro(tm)
options         NO_F00F_HACK
options         COMPAT_43
options         SYSVSHM
options         SYSVSEM
options         SYSVMSG
options         DDB
# options       DDB_UNATTENDED
options         INVARIANTS
options         INVARIANT_SUPPORT
options         UCONSOLE
options         INET                    #Internet communications protocols
device          ether                   #Generic Ethernet
device          loop    1               #Network loopback device
device          bpf                     #Berkeley packet filter
device          tun                     #Tunnel driver (ppp(8), nos-tun(8))
options         BRIDGE
options         FFS                     #Fast filesystem
options         NFS                     #Network File System
options         PROCFS                  #Process filesystem
options         FFS_ROOT                #FFS usable as root device
options         SOFTUPDATES
# options       FFS_EXTATTR
options         RANDOMDEV
options         P1003_1B
options         _KPOSIX_VERSION=199309L
options         HZ=1000
device          scbus           #base SCSI code
device          da              #SCSI direct access devices (aka disks)
device          cd              #SCSI CD-ROMs
device          pt              #SCSI processor 
device          targ            #SCSI Target Mode Code
device          targbh          #SCSI Target Mode Blackhole Device
device          pass            #CAM passthrough driver
options         SCSI_DELAY=5000 # Be pessimistic about Joe SCSI device
device          pty             #Pseudo ttys
device          vn              #Vnode driver (turns a file into a device)
device          snp             #Snoop device - to look at pty/vty/etc..
options         MSGBUF_SIZE=40960
device          isa
options         COMPAT_OLDISA   #Use ISA shims and glue for old drivers
device          pci
options         COMPAT_OLDPCI   #Use PCI shims and glue for old drivers
device          atkbdc  1
device          atkbd
device          psm
device          vga
options         VESA
device          splash
device          sc      1
options         MAXCONS=9               # number of virtual consoles
options         SC_DISABLE_REBOOT       # disable reboot key sequence
options         SC_HISTORY_SIZE=800     # number of history buffer lines
device          npx
device          ahc
options         AHC_ALLOW_MEMIO
device          ata
device          atadisk         # ATA disk drives
device          atapicd         # ATAPI CDROM drives
options         ATA_ENABLE_ATAPI_DMA
device          fdc
device          sio
device          miibus
device          ed
device          fxp             # Intel EtherExpress PRO/100B (82557, 82558)
device          pcm
options         DONTPROBE_1284  # Avoid boot detection of PnP parallel devices
device          ppc
device          ppbus
device          lpt
device          plip
device          ppi
options         COMPAT_LINUX
options         SHMMAX=(64*1024*1024)
options         SHMMNI=4096
options         SHMSEG=256

Vallo Kallaste

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