Panic: vm_fault: fault on nofault entry, addr: c1d9c000

Tue Jun 12 00:49:56 UTC 2007

For some time now, weeks, actually my FreeBSD box has been crashing aparrantly 
randomly. It took me forever but I finally managed to capture a dump! Here is 
what kgdb said:

-----------------------------------------------------------------------------
Script started on Mon Jun 11 19:56:46 2007
kgdb kernel.debug /var/crash/vmcore.0  

kgdb: kvm_nlist(_stopped_cpus):  
kgdb: kvm_nlist(_stoppcbs):  
[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: 
Undefined symbol "ps_pglobal_lookup"] 
GNU gdb 6.1.1 [FreeBSD] 
Copyright 2004 Free Software Foundation, Inc. 
GDB is free software, covered by the GNU General Public License, and you are 
welcome to change it and/or distribute copies of it under certain conditions. 
Type "show copying" to see the conditions. 
There is absolutely no warranty for GDB.  Type "show warranty" for details. 
This GDB was configured as "i386-marcel-freebsd". 

Unread portion of the kernel message buffer: 
panic: vm_fault: fault on nofault entry, addr: c1d9c000 
Uptime: 2d1h27m41s 
Dumping 351 MB (2 chunks) 
  chunk 0: 1MB (159 pages) ... ok 
  chunk 1: 351MB (89840 pages) 335 319 303 287 271 255 239 223 207 191 175 159 
143 127 111 95 79 63 47 31 15 

#0  doadump () at pcpu.h:165 
165		__asm __volatile("movl %%fs:0,%0" : "=r" (td)); 
(kgdb) jhengis# ^D  exit 
Script done on Mon Jun 11 19:56:59 2007
-----------------------------------------------------------------------------

I have never had to debug a kernel dump before, and frankly am unfamiliar with 
the procedure, Sorry if I have missed something obvious :(

The crashes started *around* the time that I upgraded to Xorg 7.2, however I 
am unsure this is the cause, notwithstanding I *think* that something that 
got rebuilt during that period is causing the crash. It does not seem, 
however, to be Xorg itself; the crashes also occur when X is not in use. I 
did not rebuild my kernel around that time.

I hope that I have provided enough information, if I have not, I can gladly 
get more. I have attached my kernel configuration, my uname -a output is:

FreeBSD jhengis.vistua.com 6.2-RELEASE-p5 FreeBSD 6.2-RELEASE-p5 #3: Sat Jun  
2 12:45:19 EDT 2007     root at jhengis.vistua.com:/usr/obj/usr/src/sys/BORODIN  
i386 
(The recent datestamp on this kernel is because I rebuilt it with debug 
information, so I could catch the dump.)

You can get the complete contents of /var/crash from 
ftp://anonymous@jhengis.vistua.com/pub/crash.tar.bz2

Any help would be greatly appreciated!
--John
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machine		i386
cpu		I686_CPU
ident		BORODIN
# To statically compile in device wiring instead of /boot/device.hints
#hints		"GENERIC.hints"		# Default places to look for devices.

makeoptions     DEBUG=-g
options 	SCHED_4BSD		# 4BSD scheduler
options 	PREEMPTION		# Enable kernel thread preemption
options 	INET			# InterNETworking
options 	INET6			# IPv6 communications protocols
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 	MD_ROOT			# MD is a potential root device
options 	PROCFS			# Process filesystem (requires PSEUDOFS)
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 	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.
device		eisa
device		pci

# Floppy drives
device		fdc

# ATA and ATAPI devices
device		ata
device		atadisk		# ATA disk drives
device		atapicd		# ATAPI CDROM drives
device		atapifd		# ATAPI floppy drives
options 	ATA_STATIC_ID	# Static device numbering
device		atapicam

# SCSI peripherals
device		scbus		# SCSI bus (required for SCSI)
device		ch		# SCSI media changers
device		da		# Direct Access (disks)
device		cd		# CD
device		pass		# Passthrough device (direct SCSI access)
device		ses		# SCSI Environmental Services (and SAF-TE)

device		atkbdc		# AT keyboard controller
device		atkbd		# AT keyboard
device		psm		# PS/2 mouse

device		sc
device		agp
device		kbdmux		# keyboard multiplexer
device		vga		# VGA video card driver
device		splash		# Splash screen and screen saver support
options		VESA
options		VGA_WIDTH90
options		SC_PIXEL_MODE

# 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		re		# RealTek 8139C+/8169/8169S/8110S
device		rl		# RealTek 8129/8139

# Pseudo devices.
device		loop		# Network loopback
device		random		# Entropy device
device		ether		# Ethernet support
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)

device		bpf		# Berkeley packet filter

# USB support
device		ehci		# EHCI PCI->USB interface (USB 2.0)
device		usb		# USB Bus (required)
device		ugen		# Generic
device		uhid		# "Human Interface Devices"
device		ulpt		# Printer
device		umass		# Disks/Mass storage - Requires scbus and da
# USB Ethernet, requires miibus
#device		rue		# RealTek RTL8150 USB Ethernet

device		atapicam