Date: Tue, 16 Oct 2007 10:17:42 GMT From: Jari Kirma <kirma.from.cs.hut.fi@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/117239: kernel panic: NULL pointer dereference in vm_fault Message-ID: <200710161017.l9GAHgBe070707@www.freebsd.org> Resent-Message-ID: <200710161020.l9GAK119071684@freefall.freebsd.org>
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>Number: 117239
>Category: kern
>Synopsis: kernel panic: NULL pointer dereference in vm_fault
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Oct 16 10:20:01 UTC 2007
>Closed-Date:
>Last-Modified:
>Originator: Jari Kirma
>Release: 6.2-STABLE
>Organization:
Helsinki University of Technology
>Environment:
FreeBSD XXX.hut.fi 6.2-STABLE FreeBSD 6.2-STABLE #1: Mon Oct 8 12:57:26 EEST 2007 root@XXX.hut.fi:/usr/obj/usr/src/sys/XXX-SMP i386
>Description:
Kernel crash on an SMP i386 workstation, also an NFS client.
Panic message:
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address = 0x5a
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc068eaba
stack pointer = 0x28:0xe57fb66c
frame pointer = 0x28:0xe57fb790
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 13259 (rxvt)
trap number = 12
panic: page fault
0xc068eaba is vm_fault+0x13e.
Essentially this panic is caused by fs.first_object being NULL.
NULL dereference occurs at src/sys/vm/fault_vm.c version 1.205.2.7, line 295:
if (fs.first_object->flags & OBJ_NEEDGIANT)
Relevant snippet of objdump -d kernel:
c068e97c <vm_fault>:
c068e97c: 55 push %ebp
c068e97d: 89 e5 mov %esp,%ebp
c068e97f: 57 push %edi
c068e980: 56 push %esi
c068e981: 53 push %ebx
c068e982: 81 ec 18 01 00 00 sub $0x118,%esp
c068e988: 8a 45 10 mov 0x10(%ebp),%al
c068e98b: 88 85 5f ff ff ff mov %al,0xffffff5f(%ebp)
c068e991: c7 85 4c ff ff ff 00 movl $0x0,0xffffff4c(%ebp)
c068e998: 00 00 00
c068e99b: c7 85 54 ff ff ff 01 movl $0x1,0xffffff54(%ebp)
c068e9a2: 00 00 00
c068e9a5: f0 83 05 b4 7b 79 c0 lock addl $0x1,0xc0797bb4
c068e9ac: 01
c068e9ad: 8b 55 08 mov 0x8(%ebp),%edx
c068e9b0: 8d 4d 80 lea 0xffffff80(%ebp),%ecx
c068e9b3: 89 55 a4 mov %edx,0xffffffa4(%ebp)
c068e9b6: 8d 9d 7f ff ff ff lea 0xffffff7f(%ebp),%ebx
c068e9bc: 51 push %ecx
c068e9bd: 53 push %ebx
c068e9be: 8d 45 9c lea 0xffffff9c(%ebp),%eax
c068e9c1: 50 push %eax
c068e9c2: 8d 55 98 lea 0xffffff98(%ebp),%edx
c068e9c5: 52 push %edx
c068e9c6: 8d 4d a8 lea 0xffffffa8(%ebp),%ecx
c068e9c9: 51 push %ecx
c068e9ca: 0f b6 85 5f ff ff ff movzbl 0xffffff5f(%ebp),%eax
c068e9d1: 50 push %eax
c068e9d2: ff 75 0c pushl 0xc(%ebp)
c068e9d5: 8d 5d a4 lea 0xffffffa4(%ebp),%ebx
c068e9d8: 53 push %ebx
c068e9d9: e8 fe 81 00 00 call c0696bdc <vm_map_lookup>
c068e9de: 83 c4 20 add $0x20,%esp
c068e9e1: 85 c0 test %eax,%eax
c068e9e3: 89 c3 mov %eax,%ebx
c068e9e5: 0f 84 b0 00 00 00 je c068ea9b <vm_fault+0x11f>
c068e9eb: 83 f8 02 cmp $0x2,%eax
c068e9ee: 74 61 je c068ea51 <vm_fault+0xd5>
c068e9f0: 8b b5 54 ff ff ff mov 0xffffff54(%ebp),%esi
c068e9f6: 85 f6 test %esi,%esi
c068e9f8: 0f 84 ce 08 00 00 je c068f2cc <vm_fault+0x950>
c068e9fe: 83 fb 01 cmp $0x1,%ebx
c068ea01: 0f 85 c5 08 00 00 jne c068f2cc <vm_fault+0x950>
c068ea07: 8b 45 08 mov 0x8(%ebp),%eax
c068ea0a: 3b 05 ac 7a 79 c0 cmp 0xc0797aac,%eax
c068ea10: 0f 84 b6 08 00 00 je c068f2cc <vm_fault+0x950>
c068ea16: 64 a1 00 00 00 00 mov %fs:0x0,%eax
c068ea1c: 8b 08 mov (%eax),%ecx
c068ea1e: 85 c9 test %ecx,%ecx
c068ea20: 0f 84 a6 08 00 00 je c068f2cc <vm_fault+0x950>
c068ea26: 64 a1 00 00 00 00 mov %fs:0x0,%eax
c068ea2c: ff 75 0c pushl 0xc(%ebp)
c068ea2f: ff 30 pushl (%eax)
c068ea31: e8 3a 7c 00 00 call c0696670 <vm_map_growstack>
c068ea36: 89 c3 mov %eax,%ebx
c068ea38: 85 db test %ebx,%ebx
c068ea3a: 58 pop %eax
c068ea3b: 5a pop %edx
c068ea3c: 0f 85 15 16 00 00 jne c0690057 <vm_fault+0x16db>
c068ea42: c7 85 54 ff ff ff 00 movl $0x0,0xffffff54(%ebp)
c068ea49: 00 00 00
c068ea4c: e9 5c ff ff ff jmp c068e9ad <vm_fault+0x31>
c068ea51: 8b 45 14 mov 0x14(%ebp),%eax
c068ea54: 83 e0 03 and $0x3,%eax
c068ea57: 83 f8 02 cmp $0x2,%eax
c068ea5a: 75 94 jne c068e9f0 <vm_fault+0x74>
c068ea5c: 8d 55 80 lea 0xffffff80(%ebp),%edx
c068ea5c: 8d 55 80 lea 0xffffff80(%ebp),%edx
c068ea5f: 52 push %edx
c068ea60: 8d 8d 7f ff ff ff lea 0xffffff7f(%ebp),%ecx
c068ea66: 51 push %ecx
c068ea67: 8d 5d 9c lea 0xffffff9c(%ebp),%ebx
c068ea6a: 53 push %ebx
c068ea6b: 8d 45 98 lea 0xffffff98(%ebp),%eax
c068ea6e: 50 push %eax
c068ea6f: 8d 55 a8 lea 0xffffffa8(%ebp),%edx
c068ea72: 52 push %edx
c068ea73: 6a 0b push $0xb
c068ea75: ff 75 0c pushl 0xc(%ebp)
c068ea78: 8d 4d a4 lea 0xffffffa4(%ebp),%ecx
c068ea7b: 51 push %ecx
c068ea7c: e8 5b 81 00 00 call c0696bdc <vm_map_lookup>
c068ea81: 83 c4 20 add $0x20,%esp
c068ea84: 85 c0 test %eax,%eax
c068ea86: 89 c3 mov %eax,%ebx
c068ea88: 0f 85 3e 08 00 00 jne c068f2cc <vm_fault+0x950>
c068ea8e: 8b 55 a8 mov 0xffffffa8(%ebp),%edx
c068ea91: f6 42 34 02 testb $0x2,0x34(%edx)
c068ea95: 75 07 jne c068ea9e <vm_fault+0x122>
c068ea97: 80 62 35 fd andb $0xfd,0x35(%edx)
c068ea9b: 8b 55 a8 mov 0xffffffa8(%ebp),%edx
c068ea9e: 8b 45 a4 mov 0xffffffa4(%ebp),%eax
c068eaa1: 8b 80 b0 00 00 00 mov 0xb0(%eax),%eax
c068eaa7: 89 85 50 ff ff ff mov %eax,0xffffff50(%ebp)
c068eaad: f6 42 30 10 testb $0x10,0x30(%edx)
c068eab1: 0f 85 93 15 00 00 jne c069004a <vm_fault+0x16ce>
c068eab7: 8b 75 98 mov 0xffffff98(%ebp),%esi
*** HERE ***
c068eaba: 66 83 7e 5a 00 cmpw $0x0,0x5a(%esi)
c068eabf: 0f 88 f2 0d 00 00 js c068f8b7 <vm_fault+0xf3b>
c068eac5: 64 8b 15 00 00 00 00 mov %fs:0x0,%edx
c068eacc: bb 04 00 00 00 mov $0x4,%ebx
c068ead1: 89 d8 mov %ebx,%eax
c068ead3: f0 0f b1 56 1c lock cmpxchg %edx,0x1c(%esi)
c068ead8: 0f 94 c0 sete %al
c068eadb: 0f b6 c0 movzbl %al,%eax
c068eade: 85 c0 test %eax,%eax
c068eae0: 0f 84 c9 0c 00 00 je c068f7af <vm_fault+0xe33>
c068eae6: ff 75 98 pushl 0xffffff98(%ebp)
c068eae9: e8 66 a4 00 00 call c0698f54 <vm_object_reference_locked>
..
dmesg:
Copyright (c) 1992-2007 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 is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.2-STABLE #1: Mon Oct 8 12:57:26 EEST 2007
root@XXX.hut.fi:/usr/obj/usr/src/sys/XXX-SMP
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Pentium(R) D CPU 2.80GHz (2805.72-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf44 Stepping = 4
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>
Features2=0x641d<SSE3,RSVD2,MON,DS_CPL,CNXT-ID,CX16,xTPR>
AMD Features=0x20100000<NX,LM>
Cores per package: 2
real memory = 1072005120 (1022 MB)
avail memory = 1031491584 (983 MB)
ACPI APIC Table: <INTEL D945PSN >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
ioapic0: Changing APIC ID to 2
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ichwd module loaded
acpi0: <INTEL D945PSN> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
cpu0: <ACPI CPU> on acpi0
p4tcc0: <CPU Frequency Thermal Control> on cpu0
cpu1: <ACPI CPU> on acpi0
p4tcc1: <CPU Frequency Thermal Control> on cpu1
acpi_button0: <Sleep Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
nvidia0: <GeForce 6600 GT> mem 0x48000000-0x4bffffff,0x40000000-0x47ffffff,0x4c000000-0x4cffffff irq 16 at device 0.0 on pci1
nvidia0: [GIANT-LOCKED]
pcm0: <Intel 82801G High Definition Audio Controller> mem 0x4d200000-0x4d203fff irq 22 at device 27.0 on pci0
pcib2: <ACPI PCI-PCI bridge> at device 28.0 on pci0
pci2: <ACPI PCI bus> on pcib2
em0: <Intel(R) PRO/1000 Network Connection Version - 6.6.6> port 0x1000-0x101f mem 0x4d100000-0x4d11ffff irq 16 at device 0.0 on pci2
em0: Ethernet address: 00:XX:XX:XX:XX:XX
em0: [FAST]
pcib3: <ACPI PCI-PCI bridge> at device 28.2 on pci0
pci3: <ACPI PCI bus> on pcib3
pcib4: <ACPI PCI-PCI bridge> at device 28.3 on pci0
pci4: <ACPI PCI bus> on pcib4
uhci0: <UHCI (generic) USB controller> port 0x2080-0x209f irq 23 at device 29.0 on pci0
uhci0: [GIANT-LOCKED]
usb0: <UHCI (generic) USB controller> 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: <UHCI (generic) USB controller> port 0x2060-0x207f irq 19 at device 29.1 on pci0
uhci1: [GIANT-LOCKED]
usb1: <UHCI (generic) USB controller> 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: <UHCI (generic) USB controller> port 0x2040-0x205f irq 18 at device 29.2 on pci0
uhci2: [GIANT-LOCKED]
usb2: <UHCI (generic) USB controller> 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
uhci3: <UHCI (generic) USB controller> port 0x2020-0x203f irq 16 at device 29.3 on pci0
uhci3: [GIANT-LOCKED]
usb3: <UHCI (generic) USB controller> on uhci3
usb3: USB revision 1.0
uhub3: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub3: 2 ports with 2 removable, self powered
ehci0: <Intel 82801GB/R (ICH7) USB 2.0 controller> mem 0x4d204000-0x4d2043ff irq 23 at device 29.7 on pci0
ehci0: [GIANT-LOCKED]
usb4: EHCI version 1.0
usb4: companion controllers, 2 ports each: usb0 usb1 usb2 usb3
usb4: <Intel 82801GB/R (ICH7) USB 2.0 controller> on ehci0
usb4: USB revision 2.0
uhub4: Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub4: 8 ports with 8 removable, self powered
umass0: Generic USB2.0 Card Reader, rev 2.00/1.9c, addr 2
pcib5: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci5: <ACPI PCI bus> on pcib5
fwohci0: <Texas Instruments TSB43AB23> mem 0x4d004000-0x4d0047ff,0x4d000000-0x4d003fff irq 17 at device 5.0 on pci5
fwohci0: OHCI version 1.10 (ROM=0)
fwohci0: No. of Isochronous channels is 4.
fwohci0: EUI64 00:90:27:00:01:9c:89:69
fwohci0: Phy 1394a available S400, 3 ports.
fwohci0: Link S400, max_rec 2048 bytes.
firewire0: <IEEE1394(FireWire) bus> on fwohci0
fwe0: <Ethernet over FireWire> on firewire0
if_fwe0: Fake Ethernet address: 02:90:27:9c:89:69
fwe0: Ethernet address: 02:90:27:9c:89:69
fwe0: if_start running deferred for Giant
sbp0: <SBP-2/SCSI over FireWire> on firewire0
fwohci0: Initiate bus reset
fwohci0: BUS reset
fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
firewire0: 1 nodes, maxhop <= 0, cable IRM = 0 (me)
firewire0: bus manager 0 (me)
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH7 UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x20b0-0x20bf irq 18 at device 31.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
atapci1: <Intel ICH7 SATA300 controller> port 0x20c8-0x20cf,0x20e4-0x20e7,0x20c0-0x20c7,0x20e0-0x20e3,0x20a0-0x20af irq 19 at device 31.2 on pci0
ata2: <ATA channel 0> on atapci1
ata3: <ATA channel 1> on atapci1
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse, device ID 3
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
ichwd0: <Intel ICH7 watchdog timer> on isa0
ichwd0: Intel ICH7 watchdog timer (ICH7 or equivalent)
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xcf800-0xd07ff,0xd0800-0xd17ff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
ugen0: HewLett Packard HP LaserJet 1200, rev 1.10/1.00, addr 2
Timecounters tick every 1.000 msec
acd0: DVDR <HL-DT-ST DVDRAM GSA-4167B/DL11> at ata0-master UDMA33
ad4: 76319MB <SAMSUNG HD080HJ WT100-33> at ata2-master SATA150
pcm0: <HDA Codec: Sigmatel STAC9221>
pcm0: <HDA Driver Revision: 20070710_0047>
acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00 sks=0x40 0x00 0x01
SMP: AP CPU #1 Launched!
cd0 at ata0 bus 0 target 0 lun 0
cd0: <HL-DT-ST DVDRAM GSA-4167B DL11> Removable CD-ROM SCSI-0 device
cd0: 33.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <Generic IC1210 CF 1.9C> Removable Direct Access SCSI-0 device
da0: 40.000MB/s transfers
da0: Attempt to query device size failed: NOT READY, Medium not present
da1 at umass-sim0 bus 0 target 0 lun 1
da1: <Generic IC1210 MS 1.9C> Removable Direct Access SCSI-0 device
da1: 40.000MB/s transfers
da1: Attempt to query device size failed: NOT READY, Medium not present
da2 at umass-sim0 bus 0 target 0 lun 2
da2: <Generic IC1210 MMC/SD 1.9C> Removable Direct Access SCSI-0 device
da2: 40.000MB/s transfers
da2: Attempt to query device size failed: NOT READY, Medium not present
da3 at umass-sim0 bus 0 target 0 lun 3
da3: <Generic IC1210 SM 1.9C> Removable Direct Access SCSI-0 device
da3: 40.000MB/s transfers
da3: Attempt to query device size failed: NOT READY, Medium not present
Trying to mount root from ufs:/dev/ad4s1a
Kernel configuration XXX-SMP:
include XXX-UP
ident XXX-SMP
options SMP
options PQ_CACHESIZE=1024
device apic
XXX-UP:
machine i386
cpu I686_CPU
ident XXX-UP
options PQ_CACHESIZE=512
options MAXDSIZ=(1024UL*1024*1024)
options MAXSSIZ=(128UL*1024*1024)
options DFLDSIZ=(1024UL*1024*1024)
options SCHED_4BSD
options PREEMPTION
device cpufreq
device acpi
device ichwd
options INET # InterNETworking
options INET6 # IPv6 communications protocols
options ZERO_COPY_SOCKETS
options NETGRAPH #netgraph(4) system
options FFS # Berkeley Fast Filesystem
options SOFTUPDATES # Enable FFS soft updates support
options UFS_ACL # Support for access control lists
options UFS_DIRHASH # Improve performance on big directories
options NFSCLIENT # Network Filesystem Client
options MSDOSFS # MSDOS Filesystem
options CD9660 # ISO 9660 Filesystem
options PROCFS # Process filesystem (requires PSEUDOFS)
options DIRECTIO
options PROCFS # Process filesystem (requires PSEUDOFS)
options LINPROCFS
options PSEUDOFS # Pseudo-filesystem framework
options PSEUDOFS # Pseudo-filesystem framework
options GEOM_GPT # GUID Partition Tables.
options COMPAT_43 # Compatible with BSD 4.3 [KEEP THIS!]
options COMPAT_FREEBSD4 # Compatible with FreeBSD4
options COMPAT_FREEBSD5 # Compatible with FreeBSD5
options COMPAT_LINUX
options SCSI_DELAY=5000 # Delay (in ms) before probing SCSI
options KTRACE # ktrace(1) support
options SYSVSHM # SYSV-style shared memory
options SYSVMSG # SYSV-style message queues
options SYSVSEM # SYSV-style semaphores
options _KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
options KBD_INSTALL_CDEV # install a CDEV entry in /dev
options ADAPTIVE_GIANT # Giant mutex is adaptive.
device apic # I/O APIC
# Bus support. Do not remove isa, even if you have no isa slots
device isa
device eisa
device pci
# Floppy drives
device fdc
# ATA and ATAPI devices
device ata
device atadisk # ATA disk drives
device ataraid # ATA RAID drives
device atapicd # ATAPI CDROM drives
device atapicam # CAM emulation
options ATA_STATIC_ID # Static device numbering
# SCSI peripherals
device scbus # SCSI bus (required for SCSI)
device ch # SCSI media changers
device da # Direct Access (disks)
device sa # Sequential Access (tape etc)
device cd # CD
device pass # Passthrough device (direct SCSI access)
device ses # SCSI Environmental Services (and SAF-TE)
# atkbdc0 controls both the keyboard and the PS/2 mouse
device atkbdc # AT keyboard controller
device atkbd # AT keyboard
device psm # PS/2 mouse
device vga # VGA video card driver
device splash # Splash screen and screen saver support
# syscons is the default console driver, resembling an SCO console
device sc
#device agp # support several AGP chipsets
# Floating point support - do not disable.
device npx
# Add suspend/resume support for the i8254.
device pmtimer
# Serial (COM) ports
device sio # 8250, 16[45]50 based serial ports
device em # Intel PRO/1000 adapter Gigabit Ethernet Card
device miibus # MII bus support
device fxp # Intel EtherExpress PRO/100B (82557, 82558)
# Pseudo devices.
device loop # Network loopback
device mem # Memory and kernel memory devices
device io # I/O device
device random # Entropy device
device ether # Ethernet support
device sl # Kernel SLIP
device ppp # Kernel PPP
device tun # Packet tunnel.
device pty # Pseudo-ttys (telnet etc)
device md # Memory "disks"
device gif # IPv6 and IPv4 tunneling
device faith # IPv6-to-IPv4 relaying (translation)
# The `bpf' device enables the Berkeley Packet Filter.
# Be aware of the administrative consequences of enabling this!
# Note that 'bpf' is required for DHCP.
device bpf # Berkeley packet filter
# USB support
device uhci # UHCI PCI->USB interface
device ohci # OHCI PCI->USB interface
device ehci # EHCI PCI->USB interface (USB 2.0)
device usb # USB Bus (required)
#device udbp # USB Double Bulk Pipe devices
device ugen # Generic
device uhid # "Human Interface Devices"
device ukbd # Keyboard
device umass # Disks/Mass storage - Requires scbus and da
device ums # Mouse
device uscanner # Scanners
# FireWire support
device firewire # FireWire bus code
device sbp # SCSI over FireWire (Requires scbus and da)
device fwe # Ethernet over FireWire (non-standard!)
>How-To-Repeat:
Not trivially repeatable?
>Fix:
Unknown.
>Release-Note:
>Audit-Trail:
>Unformatted:
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