kmem_malloc crash with 4.8

Lamont Lucas lamont at cluepon.com
Mon Apr 7 14:08:00 PDT 2003 

Hi.  I've recently borrowed a SuperMicro 6013P-8 from a vendor
for the purposes of testing it to see if FreeBSD and these machines will
make a good replacements for our current flock of 11 Netra T1s running
solaris.  Things are going very well with the tests, with the glaring
exception of the following crash:

While doing some significant disk operations: du, deleting a different
part of the tree and finally running "sync" the machine locked hard
with the following errors:

panic: kmem_malloc(4096): kmem_map too small: 230162432 total allocated
mp_lock = 03000001; cpuid = 3; lapic.id = 07000000
boot() called on cpu#3

Then "Synching disks" but no futher output is printed, nor is any
further progress made.

This machine was installed off of 4.8-release and was rebuilt under
-stable as of april 4th, late in the afternoon.  The kernel conf file
is attached, but biggest changes I made were to enable SMP as well as 
hyperthreading.  It has 2 gigs of ram and 2 2.4 ghz xeon processors
capable of hyperthreading.  The drive is a single <SEAGATE ST336753LC 0003>
controlled by a AIC7902 Ultra 320 scsi adapter.

I saw the previous discussion about the adaptec U320 controllers and
scott long's advice about "lower[ing] the tag depth to 32" using
camcontrol tags.  I'm currently planning on removing hyperthread
support and rerunning some of my tests to see if I can reproduce the
error.  I'm also going to try some bonnie tests.  If I can 
consistantly reproduce the error I'll report back, but I'd appreciate
knowing what additional debug info I can give back.  I'm not clear
what would cause this type of error.

Attached are dmesg as well as the kernel config file.

Can anybody recommend any other steps to try and eliminate or fix
this problem?


-- 
 - Lamont
"I am not an atomic playboy."
-------------- next part --------------
Copyright (c) 1992-2003 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 4.8-RELEASE #1: Sat Apr  5 03:51:24 PST 2003
    root at sm0test.shockwave.com:/usr/obj/usr/src/sys/SM6013P-8
Timecounter "i8254"  frequency 1193182 Hz
CPU: Intel(R) Xeon(TM) CPU 2.40GHz (2399.33-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf27  Stepping = 7
  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
  Hyperthreading: 2 logical CPUs
real memory  = 2146959360 (2096640K bytes)
avail memory = 2085826560 (2036940K bytes)
Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
Programming 24 pins in IOAPIC #1
Programming 24 pins in IOAPIC #2
FreeBSD/SMP: Multiprocessor motherboard
 cpu0 (BSP): apic id:  0, version: 0x00050014, at 0xfee00000
 cpu1 (AP):  apic id:  6, version: 0x00050014, at 0xfee00000
 cpu2 (AP):  apic id:  1, version: 0x00050014, at 0xfee00000
 cpu3 (AP):  apic id:  7, version: 0x00050014, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00178020, at 0xfec00000
 io1 (APIC): apic id:  3, version: 0x00178020, at 0xfec80000
 io2 (APIC): apic id:  4, version: 0x00178020, at 0xfec80400
Preloaded elf kernel "kernel" at 0xc052c000.
Pentium Pro MTRR support enabled
md0: Malloc disk
Using $PIR table, 24 entries at 0xc00fde40
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> on motherboard
IOAPIC #0 intpin 16 -> irq 2
IOAPIC #0 intpin 19 -> irq 10
IOAPIC #0 intpin 18 -> irq 11
pci0: <PCI bus> on pcib0
pcib1: <PCI to PCI bridge (vendor=8086 device=2543)> at device 2.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <unknown card> (vendor=0x8086, dev=0x1461) at 28.0
pcib2: <PCI to PCI bridge (vendor=8086 device=1460)> at device 29.0 on pci1
IOAPIC #2 intpin 6 -> irq 16
IOAPIC #2 intpin 7 -> irq 17
pci2: <PCI bus> on pcib2
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.4.10> port 0x3000-0x303f mem 0xfc200000-0xfc21ffff irq 16 at device 3.0 on pci2
em0:  Speed:100 Mbps  Duplex:Full
em1: <Intel(R) PRO/1000 Network Connection, Version - 1.4.10> port 0x3040-0x307f mem 0xfc220000-0xfc23ffff irq 17 at device 3.1 on pci2
em1:  Speed:N/A  Duplex:N/A
pci1: <unknown card> (vendor=0x8086, dev=0x1461) at 30.0
pcib3: <PCI to PCI bridge (vendor=8086 device=1460)> at device 31.0 on pci1
IOAPIC #1 intpin 4 -> irq 18
IOAPIC #1 intpin 5 -> irq 19
pci3: <PCI bus> on pcib3
ahd0: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0x4000-0x40ff,0x4400-0x44ff mem 0xfc300000-0xfc301fff irq 18 at device 2.0 on pci3
aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 101-133Mhz, 512 SCBs
ahd1: <Adaptec AIC7902 Ultra320 SCSI adapter> port 0x4800-0x48ff,0x4c00-0x4cff mem 0xfc302000-0xfc303fff irq 19 at device 2.1 on pci3
aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 101-133Mhz, 512 SCBs
uhci0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> port 0x2000-0x201f irq 2 at device 29.0 on pci0
usb0: <Intel 82801CA/CAM (ICH3) USB controller USB-A> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
uhci1: <Intel 82801CA/CAM (ICH3) USB controller USB-B> port 0x2020-0x203f irq 10 at device 29.1 on pci0
usb1: <Intel 82801CA/CAM (ICH3) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801CA/CAM (ICH3) USB controller USB-C> port 0x2040-0x205f irq 11 at device 29.2 on pci0
usb2: <Intel 82801CA/CAM (ICH3) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
pcib4: <Intel 82801BA/BAM (ICH2) Hub to PCI bridge> at device 30.0 on pci0
pci4: <PCI bus> on pcib4
pci4: <ATI Mach64-GR graphics accelerator> at 1.0 irq 2
isab0: <PCI to ISA bridge (vendor=8086 device=2480)> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH3 ATA100 controller> port 0x2060-0x206f,0x374-0x377,0x170-0x177,0x3f4-0x3f7,0x1f0-0x1f7 mem 0xfc000000-0xfc0003ff irq 0 at device 31.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <unknown card> (vendor=0x8086, dev=0x2483) at 31.3 irq 0
eisa0: <EISA bus> on motherboard
eisa0: unknown card @@@0000 (0x00000000) at slot 4
orm0: <Option ROMs> at iomem 0xc0000-0xc7fff,0xc8000-0xc8fff,0xdc000-0xdffff,0xe0000-0xe3fff on isa0
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
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: failed to get data.
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse, device ID 3
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 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
ppc0: parallel port not found.
ahd1: PCI error Interrupt
>>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<
ahd1: Dumping Card State at program address 0x3 Mode 0x33
Card was paused
HS_MAILBOX[0x0] INTCTL[0x0] SEQINTSTAT[0x0] SAVED_MODE[0x0] 
DFFSTAT[0x30]:(CURRFIFO_0|FIFO0FREE|FIFO1FREE) SCSISIGI[0x0]:(P_DATAOUT) 
SCSIPHASE[0x0] SCSIBUS[0x0] LASTPHASE[0x1]:(P_DATAOUT|P_BUSFREE) 
SCSISEQ0[0x0] SCSISEQ1[0x12]:(ENAUTOATNP|ENRSELI) 
SEQCTL0[0x10]:(FASTMODE) SEQINTCTL[0x0] SEQ_FLAGS[0x0] 
SEQ_FLAGS2[0x0] SSTAT0[0x0] SSTAT1[0x8]:(BUSFREE) 
SSTAT2[0x0] SSTAT3[0x0] PERRDIAG[0x0] SIMODE1[0xa4]:(ENSCSIPERR|ENSCSIRST|ENSELTIMO) 
LQISTAT0[0x0] LQISTAT1[0x0] LQISTAT2[0x0] LQOSTAT0[0x0] 
LQOSTAT1[0x0] LQOSTAT2[0x0] 

SCB Count = 16 CMDS_PENDING = 0 LASTSCB 0xffff CURRSCB 0x0 NEXTSCB 0x0
qinstart = 0 qinfifonext = 0
QINFIFO:
WAITING_TID_QUEUES:
Pending list:
Total 0
Kernel Free SCB list: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 
Sequencer Complete DMA-inprog list: 
Sequencer Complete list: 
Sequencer DMA-Up and Complete list: 

ahd1: FIFO0 Free, LONGJMP == 0x80ff, SCB 0x0, LJSCB 0xff00
SEQIMODE[0x3f]:(ENCFG4TCMD|ENCFG4ICMD|ENCFG4TSTAT|ENCFG4ISTAT|ENCFG4DATA|ENSAVEPTRS) 
SEQINTSRC[0x0] DFCNTRL[0x0] DFSTATUS[0x89]:(FIFOEMP|HDONE|PRELOAD_AVAIL) 
SG_CACHE_SHADOW[0x2]:(LAST_SEG) SG_STATE[0x0] DFFSXFRCTL[0x0] 
SOFFCNT[0x0] MDFFSTAT[0x5]:(FIFOFREE|DLZERO) SHADDR = 0x00, SHCNT = 0x0 
HADDR = 0x00, HCNT = 0x0 CCSGCTL[0x10]:(SG_CACHE_AVAIL) 
ahd1: FIFO1 Free, LONGJMP == 0x80ff, SCB 0x0, LJSCB 0xff00
SEQIMODE[0x3f]:(ENCFG4TCMD|ENCFG4ICMD|ENCFG4TSTAT|ENCFG4ISTAT|ENCFG4DATA|ENSAVEPTRS) 
SEQINTSRC[0x0] DFCNTRL[0x0] DFSTATUS[0x89]:(FIFOEMP|HDONE|PRELOAD_AVAIL) 
SG_CACHE_SHADOW[0x2]:(LAST_SEG) SG_STATE[0x0] DFFSXFRCTL[0x0] 
SOFFCNT[0x0] MDFFSTAT[0x5]:(FIFOFREE|DLZERO) SHADDR = 0x00, SHCNT = 0x0 
HADDR = 0x00, HCNT = 0x0 CCSGCTL[0x10]:(SG_CACHE_AVAIL) 
LQIN: 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 
ahd1: LQISTATE = 0x0, LQOSTATE = 0x0, OPTIONMODE = 0x42
ahd1: OS_SPACE_CNT = 0x20 MAXCMDCNT = 0x0

SIMODE0[0x6c]:(ENOVERRUN|ENIOERR|ENSELDI|ENSELDO) 
CCSCBCTL[0x0] 
ahd1: REG0 == 0x3c36, SINDEX = 0x33, DINDEX = 0x0
ahd1: SCBPTR == 0x1ff, SCB_NEXT == 0xff00, SCB_NEXT2 == 0x0
CDB ff 1 0 0 0 0
STACK: 0x8 0x7 0x6 0x5 0x4 0x3 0x2e 0x1
>>>>>>>>>>>>>>>>>
ahd1: Signaled Target Abort
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
SMP: AP CPU #2 Launched!
SMP: AP CPU #3 Launched!
acd0: CDROM <MATSHITA CR-177> at ata1-master PIO4
Waiting 15 seconds for SCSI devices to settle
SMP: AP CPU #1 Launched!
pass1 at ahd0 bus 0 target 6 lun 0
pass1: <SDR GEM318 0> Fixed Processor SCSI-2 device 
pass1: 3.300MB/s transfers
da0 at ahd0 bus 0 target 0 lun 0
da0: <SEAGATE ST336753LC 0003> Fixed Direct Access SCSI-3 device 
da0: 320.000MB/s transfers (160.000MHz, offset 63, 16bit), Tagged Queueing Enabled
da0: 35003MB (71687372 512 byte sectors: 255H 63S/T 4462C)
Mounting root from ufs:/dev/da0s1a
-------------- next part --------------
#
# GENERIC -- Generic kernel configuration file for FreeBSD/i386
#
# For more information on this file, please read the handbook section on
# Kernel Configuration Files:
#
#    http://www.FreeBSD.org/doc/en_US.ISO8859-1/books/handbook/kernelconfig-config.html
#
# The handbook is also available locally in /usr/share/doc/handbook
# if you've installed the doc distribution, otherwise always see the
# FreeBSD World Wide Web server (http://www.FreeBSD.org/) for the
# latest information.
#
# An exhaustive list of options and more detailed explanations of the
# device lines is also present in the ./LINT configuration file. If you are
# in doubt as to the purpose or necessity of a line, check first in LINT.
#
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.246.2.51.2.2 2003/03/25 23:35:15 jhb Exp $

machine		i386
cpu		I686_CPU
ident		SM6013P-8
maxusers	0

#makeoptions	DEBUG=-g		#Build kernel with gdb(1) debug symbols

options 	MATH_EMULATE		#Support for x87 emulation
options 	INET			#InterNETworking
options 	INET6			#IPv6 communications protocols
options 	FFS			#Berkeley Fast Filesystem
options 	FFS_ROOT		#FFS usable as root device [keep this!]
options 	SOFTUPDATES		#Enable FFS soft updates support
options 	UFS_DIRHASH		#Improve performance on big directories
options 	MFS			#Memory Filesystem
options 	MD_ROOT			#MD is a potential root device
options 	NFS			#Network Filesystem
options 	NFS_ROOT		#NFS usable as root device, NFS required
options 	MSDOSFS			#MSDOS Filesystem
options 	CD9660			#ISO 9660 Filesystem
options 	CD9660_ROOT		#CD-ROM usable as root, CD9660 required
options 	PROCFS			#Process filesystem
options 	COMPAT_43		#Compatible with BSD 4.3 [KEEP THIS!]
options 	SCSI_DELAY=15000	#Delay (in ms) before probing SCSI
options 	UCONSOLE		#Allow users to grab the console
options 	USERCONFIG		#boot -c editor
options 	VISUAL_USERCONFIG	#visual boot -c editor
options 	KTRACE			#ktrace(1) support
options 	SYSVSHM			#SYSV-style shared memory
options 	SYSVMSG			#SYSV-style message queues
options 	SYSVSEM			#SYSV-style semaphores
options 	P1003_1B		#Posix P1003_1B real-time extensions
options 	_KPOSIX_PRIORITY_SCHEDULING
options 	ICMP_BANDLIM		#Rate limit bad replies
options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev
options 	AHC_REG_PRETTY_PRINT	# Print register bitfields in debug
					# output.  Adds ~128k to driver.
options 	AHD_REG_PRETTY_PRINT	# Print register bitfields in debug 
					# output.  Adds ~215k to driver.

# To make an SMP kernel, the next two are needed
options 	SMP			# Symmetric MultiProcessor Kernel
options 	APIC_IO			# Symmetric (APIC) I/O

# To support HyperThreading, HTT is needed in addition to SMP and APIC_IO
options 	HTT			# HyperThreading Technology

device		isa
device		eisa
device		pci

# Floppy drives
device		fdc0	at isa? port IO_FD1 irq 6 drq 2
device		fd0	at fdc0 drive 0
device		fd1	at fdc0 drive 1
#
# If you have a Toshiba Libretto with its Y-E Data PCMCIA floppy,
# don't use the above line for fdc0 but the following one:
#device		fdc0

# ATA and ATAPI devices
device		ata0	at isa? port IO_WD1 irq 14
device		ata1	at isa? port IO_WD2 irq 15
device		ata
device		atadisk			# ATA disk drives
device		atapicd			# ATAPI CDROM drives
device		atapifd			# ATAPI floppy drives
device		atapist			# ATAPI tape drives
options 	ATA_STATIC_ID		#Static device numbering

# SCSI Controllers
device		ahb		# EISA AHA1742 family
device		ahc		# AHA2940 and onboard AIC7xxx devices
device		ahd		# AHA39320/29320 and onboard AIC79xx devices
device		amd		# AMD 53C974 (Tekram DC-390(T))
device		isp		# Qlogic family
device		mpt		# LSI-Logic MPT/Fusion
device		ncr		# NCR/Symbios Logic
device		sym		# NCR/Symbios Logic (newer chipsets)
options 	SYM_SETUP_LP_PROBE_MAP=0x40
				# Allow ncr to attach legacy NCR devices when 
				# both sym and ncr are configured

device		adv0	at isa?
device		adw
device		bt0	at isa?
device		aha0	at isa?
device		aic0	at isa?

device		ncv		# NCR 53C500
device		nsp		# Workbit Ninja SCSI-3
device		stg		# TMC 18C30/18C50

# SCSI peripherals
device		scbus		# SCSI bus (required)
device		da		# Direct Access (disks)
device		sa		# Sequential Access (tape etc)
device		cd		# CD
device		pass		# Passthrough device (direct SCSI access)

# RAID controllers interfaced to the SCSI subsystem
device		asr		# DPT SmartRAID V, VI and Adaptec SCSI RAID
device		dpt		# DPT Smartcache - See LINT for options!
device		iir		# Intel Integrated RAID
device		mly		# Mylex AcceleRAID/eXtremeRAID
device		ciss		# Compaq SmartRAID 5* series

# RAID controllers
device		aac		# Adaptec FSA RAID, Dell PERC2/PERC3
#device		aacp		# SCSI passthrough for aac (requires CAM)
device		ida		# Compaq Smart RAID
device		amr		# AMI MegaRAID
device		mlx		# Mylex DAC960 family
device		twe		# 3ware Escalade

# atkbdc0 controls both the keyboard and the PS/2 mouse
device		atkbdc0	at isa? port IO_KBD
device		atkbd0	at atkbdc? irq 1 flags 0x1
device		psm0	at atkbdc? irq 12

device		vga0	at isa?

# splash screen/screen saver
pseudo-device	splash

# syscons is the default console driver, resembling an SCO console
device		sc0	at isa? flags 0x100

# Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver
#device		vt0	at isa?
#options 	XSERVER			# support for X server on a vt console
#options 	FAT_CURSOR		# start with block cursor
# If you have a ThinkPAD, uncomment this along with the rest of the PCVT lines
#options 	PCVT_SCANSET=2		# IBM keyboards are non-std

device		agp		# support several AGP chipsets

# Floating point support - do not disable.
device		npx0	at nexus? port IO_NPX irq 13

# Power management support (see LINT for more options)
device		apm0	at nexus? disable flags 0x20 # Advanced Power Management

# PCCARD (PCMCIA) support
device		card
device		pcic0	at isa? irq 0 port 0x3e0 iomem 0xd0000
device		pcic1	at isa? irq 0 port 0x3e2 iomem 0xd4000 disable

# Serial (COM) ports
device		sio0	at isa? port IO_COM1 flags 0x10 irq 4
device		sio1	at isa? port IO_COM2 irq 3
device		sio2	at isa? disable port IO_COM3 irq 5
device		sio3	at isa? disable port IO_COM4 irq 9

# Parallel port
device		ppc0	at isa? irq 7
device		ppbus		# Parallel port bus (required)
device		lpt		# Printer
device		plip		# TCP/IP over parallel
device		ppi		# Parallel port interface device
#device		vpo		# Requires scbus and da


# PCI Ethernet NICs.
device		de		# DEC/Intel DC21x4x (``Tulip'')
device		em		# Intel PRO/1000 adapter Gigabit Ethernet Card (``Wiseman'')
device		txp		# 3Com 3cR990 (``Typhoon'')
device		vx		# 3Com 3c590, 3c595 (``Vortex'')

# PCI Ethernet NICs that use the common MII bus controller code.
# NOTE: Be sure to keep the 'device miibus' line in order to use these NICs!
device		miibus		# MII bus support
device		dc		# DEC/Intel 21143 and various workalikes
device		fxp		# Intel EtherExpress PRO/100B (82557, 82558)
device		pcn		# AMD Am79C97x PCI 10/100 NICs
device		rl		# RealTek 8129/8139
device		sf		# Adaptec AIC-6915 (``Starfire'')
device		sis		# Silicon Integrated Systems SiS 900/SiS 7016
device		ste		# Sundance ST201 (D-Link DFE-550TX)
device		tl		# Texas Instruments ThunderLAN
device		tx		# SMC EtherPower II (83c170 ``EPIC'')
device		vr		# VIA Rhine, Rhine II
device		wb		# Winbond W89C840F
device		xl		# 3Com 3c90x (``Boomerang'', ``Cyclone'')
device		bge		# Broadcom BCM570x (``Tigon III'')

# ISA Ethernet NICs.
# 'device ed' requires 'device miibus'
device		ed0	at isa? disable port 0x280 irq 10 iomem 0xd8000
device		ex
device		ep
device		fe0	at isa? disable port 0x300
# Xircom Ethernet
device		xe
# PRISM I IEEE 802.11b wireless NIC.
device		awi
# WaveLAN/IEEE 802.11 wireless NICs. Note: the WaveLAN/IEEE really
# exists only as a PCMCIA device, so there is no ISA attachment needed
# and resources will always be dynamically assigned by the pccard code.
device		wi
# Aironet 4500/4800 802.11 wireless NICs. Note: the declaration below will
# work for PCMCIA and PCI cards, as well as ISA cards set to ISA PnP
# mode (the factory default). If you set the switches on your ISA
# card for a manually chosen I/O address and IRQ, you must specify
# those parameters here.
device		an
# The probe order of these is presently determined by i386/isa/isa_compat.c.
device		ie0	at isa? disable port 0x300 irq 10 iomem 0xd0000
#device		le0	at isa? disable port 0x300 irq 5 iomem 0xd0000
device		lnc0	at isa? disable port 0x280 irq 10 drq 0
device		cs0	at isa? disable port 0x300
device		sn0	at isa? disable port 0x300 irq 10

# Pseudo devices - the number indicates how many units to allocate.
pseudo-device	loop		# Network loopback
pseudo-device	ether		# Ethernet support
pseudo-device	sl	1	# Kernel SLIP
pseudo-device	ppp	1	# Kernel PPP
pseudo-device	tun		# Packet tunnel.
pseudo-device	pty		# Pseudo-ttys (telnet etc)
pseudo-device	md		# Memory "disks"
pseudo-device	gif		# IPv6 and IPv4 tunneling
pseudo-device	faith	1	# IPv6-to-IPv4 relaying (translation)

# The `bpf' pseudo-device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
pseudo-device	bpf		#Berkeley packet filter

# USB support
device		uhci		# UHCI PCI->USB interface
device		ohci		# OHCI PCI->USB interface
device		usb		# USB Bus (required)
device		ugen		# Generic
device		uhid		# "Human Interface Devices"
device		ukbd		# Keyboard
device		ulpt		# Printer
device		umass		# Disks/Mass storage - Requires scbus and da
device		ums		# Mouse
device		uscanner	# Scanners
device		urio		# Diamond Rio MP3 Player
# USB Ethernet, requires mii
device		aue		# ADMtek USB ethernet
device		cue		# CATC USB ethernet
device		kue		# Kawasaki LSI USB ethernet

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