kern/52648: bonnie gives kernel panic in SMP but not in UNI on FBSD 5.0

Stefan A. Deutscher stefand at attglobal.net
Sat May 24 09:50:14 PDT 2003


>Number:         52648
>Category:       kern
>Synopsis:       bonnie gives kernel panic in SMP but not in UNI on FBSD 5.0
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat May 24 09:50:12 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator:     Charlie &
>Release:        FreeBSD 5.0-RELEASE i386
>Organization:
<organization of PR author (multiple lines)>
>Environment:
System: FreeBSD twintower.asylum.net 5.0-RELEASE FreeBSD 5.0-RELEASE #0: Sun Mar 2 16:12:08 CET 2003 root at twintower.asylum.net:/usr/src/sys/i386/compile/TD4-SMP-DEBUG-i586 i386


	<machine, os, target, libraries (multiple lines)>
Intergraph TD-4 SMP box (PCI/EISA), 2 Pentium 100 MHz CPUs, 192 MB FPM RAM,
NCR SCSI 53c810 based, all SCSI disks, Matrox Millenium Graphics card,
FreeBSD 5.0-Release (same problem on 4.7 and 4.8 Release)

>Description:
	running bonnie with SMP kernel leads within seconds to kernel dump;
        (building kernel with SMP kernel does as well, 
        running gnome2 sooner or later too, but I don't have output of 
        gdb at hand for these cases.
        On these same tasks and in general, the machine is stable running
        with the GENERIC non-SMP kernel config.
        The RAM is stable, too: removing modules or switching 
        them around (down to only 32 MB) does not change anything, it passes
        memtest (from ports) and standalone from www.memtest86.com w/o
        a hickup.

        The same thing happens on 4.7 Release and 4.8 Release and
        5.0 Release.
        

        Output of mptable, pciconf, gdb -k and dmesg, kernel config below

>How-To-Repeat:
        boot into SMP kernel and start bonnie
>Fix:

       No idea, other than running GENERIC non-SMP kernel

            Cheers, Stefan


#
# 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 ../../conf/NOTES and NOTES files. 
# If you are in doubt as to the purpose or necessity of a line, check first 
# in NOTES.
#
# $FreeBSD: src/sys/i386/conf/GENERIC,v 1.369.2.2 2002/12/31 05:35:45 scottl Exp $

machine		i386
#cpu		I486_CPU
cpu		I586_CPU
#cpu		I686_CPU
ident		TD4-SMP-DEBUG-i586
maxusers	0

#To statically compile in device wiring instead of /boot/device.hints
#hints		"GENERIC.hints"		#Default places to look for devices.

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

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 	NFSCLIENT		#Network Filesystem Client
options 	NFSSERVER		#Network Filesystem Server
options 	NFS_ROOT		#NFS usable as root device, requires NFSCLIENT
options 	MSDOSFS			#MSDOS Filesystem
options 	CD9660			#ISO 9660 Filesystem
options 	PROCFS			#Process filesystem (requires PSEUDOFS)
options 	PSEUDOFS		#Pseudo-filesystem framework
options 	COMPAT_43		#Compatible with BSD 4.3 [KEEP THIS!]
options 	COMPAT_FREEBSD4		#Compatible with FreeBSD4
options 	SCSI_DELAY=15000	#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 	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.

# Debugging for use in -current
options 	DDB			#Enable the kernel debugger
options         DDB_UNATTENDED          #Start panic and dump automtically
#options 	INVARIANTS		#Enable calls of extra sanity checking
options 	INVARIANT_SUPPORT	#Extra sanity checks of internal structures, required by INVARIANTS
#options 	WITNESS			#Enable checks to detect deadlocks and cycles
#options 	WITNESS_SKIPSPIN	#Don't run witness on spinlocks for speed

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

device		isa
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
#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 + those of `ncr')

device		adv		# Advansys SCSI adapters
device		adw		# Advansys wide SCSI adapters
#device		aha		# Adaptec 154x SCSI adapters
#device		aic		# Adaptec 15[012]x SCSI adapters, AIC-6[23]60.
#device		bt		# Buslogic/Mylex MultiMaster SCSI adapters

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

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

# SCSI peripherals
device		scbus		# SCSI bus (required)
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)

# RAID controllers
#device		aac		# Adaptec FSA RAID
#device		aacp		# SCSI passthrough for aac (requires CAM)
#device		amr		# AMI MegaRAID
#device		ida		# Compaq Smart RAID
#device		mlx		# Mylex DAC960 family
#device		pst		# Promise Supertrak SX6000
#device		twe		# 3ware ATA RAID

# 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

# Enable this for the pcvt (VT220 compatible) console driver
#device		vt
#options 	XSERVER			# support for X server on a vt console
#options 	FAT_CURSOR		# start with block cursor

#device		agp		# support several AGP chipsets

# Floating point support - do not disable.
device		npx

# Power management support (see NOTES for more options)
#device		apm
# Add suspend/resume support for the i8254.
device		pmtimer

# PCCARD (PCMCIA) support
# Pcmcia and cardbus bridge support
device		cbb			# cardbus (yenta) bridge
#device		pcic			# ExCA ISA and PCI bridges
device		pccard			# PC Card (16-bit) bus
device		cardbus			# CardBus (32-bit) bus

# Serial (COM) ports
device		sio		# 8250, 16[45]50 based serial ports

# Parallel port
device		ppc
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
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 (precedence over 'lnc')
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 BCM570xx Gigabit Ethernet

# ISA Ethernet NICs.  pccard nics included.
device		cs		# Crystal Semiconductor CS89x0 NIC
# 'device ed' requires 'device miibus'
device		ed		# NE[12]000, SMC Ultra, 3c503, DS8390 cards
device		ex		# Intel EtherExpress Pro/10 and Pro/10+
device		ep		# Etherlink III based cards
device		fe		# Fujitsu MB8696x based cards
device		lnc		# NE2100, NE32-VL Lance Ethernet cards
device		sn		# SMC's 9000 series of ethernet chips
device		xe		# Xircom pccard ethernet

# ISA devices that use the old ISA shims
#device		le

# Wireless NIC cards
device		an		# Aironet 4500/4800 802.11 wireless NICs. 
device		awi		# BayStack 660 and others
device		wi		# WaveLAN/Intersil/Symbol 802.11 wireless NICs.
#device		wl		# Older non 802.11 Wavelan wireless NIC.

# Pseudo devices - the number indicates how many units to allocate.
device		random		# Entropy device
device		loop		# Network loopback
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!
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		udbp		# USB Double Bulk Pipe devices
#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		urio		# Diamond Rio 500 MP3 player
#device		uscanner	# Scanners
# USB Ethernet, requires mii
#device		aue		# ADMtek USB ethernet
#device		cue		# CATC USB ethernet
#device		kue		# Kawasaki LSI USB ethernet



# mptable -verbose -dmesg > dmesg.txt

===============================================================================

MPTable, version 2.0.15

 looking for EBDA pointer @ 0x040e, found, searching EBDA @ 0x0009fc00
 searching CMOS 'top of mem' @ 0x0009e800 (634K)
 searching default 'top of mem' @ 0x0009fc00 (639K)
 searching BIOS @ 0x000f0000

 MP FPS found in BIOS @ physical addr: 0x000fbab0

-------------------------------------------------------------------------------

MP Floating Pointer Structure:

  location:			BIOS
  physical address:		0x000fbab0
  signature:			'_MP_'
  length:			16 bytes
  version:			1.1
  checksum:			0x9d
  mode:				Virtual Wire

-------------------------------------------------------------------------------

  MP default config type: 6

   bus: EISA+PCI, APIC: Integrated

-------------------------------------------------------------------------------

dmesg output:

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 5.0-RELEASE #0: Sun Mar  2 16:12:08 CET 2003
    root at twintower.asylum.net:/usr/src/sys/i386/compile/TD4-SMP-DEBUG-i586
Preloaded elf kernel "/boot/kernel/kernel" at 0xc04f0000.
Timecounter "i8254"  frequency 1193182 Hz
CPU: Pentium/P54C (97.58-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x524  Stepping = 4
  Features=0x7bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,APIC,oldMTRR>
real memory  = 201326592 (192 MB)
avail memory = 190210048 (181 MB)
Changing APIC ID for IO APIC #0 from 0 to 2 on chip
Programming 16 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
 cpu0 (BSP): apic id:  0, version: 0x00030010, at 0xfee00000
 cpu1 (AP):  apic id:  1, version: 0x00030010, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x000f0011, at 0xfec00000
Intel Pentium detected, installing workaround for F00F bug
Initializing GEOMetry subsystem
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <Host to PCI bridge> at pcibus 0 on motherboard
pci0: <PCI bus> on pcib0
eisab0: <PCI-EISA bridge> at device 2.0 on pci0
eisa0: <EISA bus> on eisab0
mainboard0: <ING2860 (System Board)> on eisa0 slot 0
isa0: <ISA bus> on eisab0
lnc0: <PCNet/PCI Ethernet adapter> port 0xff80-0xff9f irq 9 at device 6.0 on pci0
lnc0: Attaching PCNet/PCI Ethernet adapter
lnc0: PCnet-PCI address 08:00:36:30:75:02
sym0: <810> port 0xfc00-0xfcff mem 0xffbebf00-0xffbebfff irq 10 at device 7.0 on pci0
sym0: No NVRAM, ID 7, Fast-10, SE, parity checking
pci0: <display, VGA> at device 8.0 (no driver attached)
orm0: <Option ROMs> at iomem 0xc8000-0xcbfff,0xc0000-0xc7fff on isa0
pmtimer0 on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x64,0x60 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model IntelliMouse Explorer, device ID 4
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> at port 0x3f7,0x3f0-0x3f5 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> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
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
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
unknown: <PNP0f03> can't assign resources (irq)
unknown: <PNP0303> can't assign resources (port)
unknown: <PNP0400> can't assign resources (port)
unknown: <PNP0500> can't assign resources (port)
unknown: <PNP0500> can't assign resources (port)
unknown: <PNP0700> can't assign resources (port)
APIC_IO: Testing 8254 interrupt delivery
APIC_IO: routing 8254 via IOAPIC #0 intpin 2
Timecounters tick every 10.000 msec
Waiting 15 seconds for SCSI devices to settle
da0 at sym0 bus 0 target 0 lun 0
da0: <IBM DPES-31080 S31Q> Fixed Direct Access SCSI-2 device 
da0: 10.000MB/s transfers (10.000MHz, offset 8), Tagged Queueing Enabled
da0: 1034MB (2118144 512 byte sectors: 255H 63S/T 131C)
da1 at sym0 bus 0 target 1 lun 0
da1: <SEAGATE ST39140N 1498> Fixed Direct Access SCSI-2 device 
da1: 10.000MB/s transfers (10.000MHz, offset 8), Tagged Queueing Enabled
da1: 8683MB (17783240 512 byte sectors: 255H 63S/T 1106C)
cd0 at sym0 bus 0 target 2 lun 0
cd0: <TOSHIBA CD-ROM XM-4101TA 1084> Removable CD-ROM SCSI-2 device 
cd0: 4.237MB/s transfers (4.237MHz, offset 8)
cd0: cd present [312514 x 2048 byte records]
SMP: AP CPU #1 Launched!
Mounting root from ufs:/dev/da1s1a

===============================================================================


# pciconf -lv

hostb0 at pci0:0:0:	class=0x060000 card=0x00000000 chip=0x04a38086 rev=0x11 hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82434LX/NX (Mercury/Neptune) Cache/DRAM Controller'
    class    = bridge
    subclass = HOST-PCI
eisab0 at pci0:2:0:	class=0x000000 card=0x00000000 chip=0x04828086 rev=0x04 hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82375EB PCI-EISA Bridge (PCEB)'
    class    = old
    subclass = non-VGA display device
lnc0 at pci0:6:0:	class=0x020000 card=0x00000000 chip=0x20001022 rev=0x02 hdr=0x00
    vendor   = 'Advanced Micro Devices (AMD)'
    device   = 'Am79C970/1/2/3/5/6 PCnet LANCE PCI Ethernet Controller'
    class    = network
    subclass = ethernet
sym0 at pci0:7:0:	class=0x000000 card=0x00000000 chip=0x00011000 rev=0x01 hdr=0x00
    vendor   = 'LSI Logic (Was: Symbios Logic, NCR)'
    device   = 'LSI53C810/810A/810AE PCI-SCSI I/O Processor'
    class    = old
    subclass = non-VGA display device
none0 at pci0:8:0:	class=0x030000 card=0x00000000 chip=0x0519102b rev=0x01 hdr=0x00
    vendor   = 'Matrox Graphics Inc'
    device   = 'MGA-2064W Storm (Millennium board)'
    class    = display
    subclass = VGA


# gdb -k kernel.debug vmcore.0
GNU gdb 5.2.1 (FreeBSD)
Copyright 2002 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-undermydesk-freebsd"...
panic: bwrite: buffer is not busy???
panic messages:
---
Fatal trap 12: page fault while in kernel mode
cpuid = 1; lapic.id = 01000000
fault virtual address	= 0x16c
fault code		= supervisor read, page not present
instruction pointer	= 0x8:0xc0283880
stack pointer	        = 0x10:0xcb54081c
frame pointer	        = 0x10:0xcb5409d0
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		= 520 (bonnie)
trap number		= 12
panic: page fault
cpuid = 1; lapic.id = 01000000
boot() called on cpu#1

syncing disks, buffers remaining... panic: bwrite: buffer is not busy???
cpuid = 1; lapic.id = 01000000
boot() called on cpu#1
Uptime: 7m39s
Dumping 192 MB
 16 32 48 64 80 96 112 128 144 160 176
---
#0  doadump () at ../../../kern/kern_shutdown.c:232
232		dumping++;
(kgdb) where
#0  doadump () at ../../../kern/kern_shutdown.c:232
#1  0xc0235f35 in boot (howto=260) at ../../../kern/kern_shutdown.c:364
#2  0xc02361f7 in panic () at ../../../kern/kern_shutdown.c:517
#3  0xc0274d92 in bwrite (bp=0xc5c4ad90) at ../../../kern/vfs_bio.c:796
#4  0xc027634e in vfs_bio_awrite (bp=0xc5c4ad90)
    at ../../../kern/vfs_bio.c:1643
#5  0xc0201f87 in spec_fsync (ap=0xcb540638)
    at ../../../fs/specfs/spec_vnops.c:462
#6  0xc02014f8 in spec_vnoperate (ap=0x0)
    at ../../../fs/specfs/spec_vnops.c:126
#7  0xc0326e0d in ffs_sync (mp=0xc1f1c600, waitfor=2, cred=0xc0d22f00, 
    td=0xc0400b20) at vnode_if.h:612
#8  0xc0287e0b in sync (td=0xc0400b20, uap=0x0)
    at ../../../kern/vfs_syscalls.c:138
#9  0xc0235bab in boot (howto=256) at ../../../kern/kern_shutdown.c:273
#10 0xc02361f7 in panic () at ../../../kern/kern_shutdown.c:517
#11 0xc0386fb2 in trap_fatal (frame=0xcb5407dc, eva=0)
    at ../../../i386/i386/trap.c:844
#12 0xc0386c62 in trap_pfault (frame=0xcb5407dc, usermode=0, eva=364)
    at ../../../i386/i386/trap.c:758
#13 0xc03867dd in trap (frame=
      {tf_fs = 24, tf_es = 16, tf_ds = 16, tf_edi = -883685340, tf_esi = 0, tf_ebp = -883684912, tf_isp = -883685368, tf_ebx = 1974, tf_edx = 1, tf_ecx = 136, tf_eax = 0, tf_trapno = 12, tf_err = 0, tf_eip = -1071105920, tf_cs = 8, tf_eflag---Type <return> to continue, or q <return> to quit---
s = 66118, tf_esp = 2080, tf_ss = -883685340}) at ../../../i386/i386/trap.c:445
#14 0xc036fad8 in calltrap () at {standard input}:99
#15 0xc0283a6f in buf_vlist_remove (bp=0x7b6) at ../../../kern/vfs_subr.c:1472
#16 0xc028480b in reassignbuf (bp=0xc5c46aa0, newvp=0xc23a7d50)
    at ../../../kern/vfs_subr.c:1897
#17 0xc0275351 in bundirty (bp=0xc5c46aa0) at ../../../kern/vfs_bio.c:1062
#18 0xc027baa3 in cluster_wbuild (vp=0xc23a7d50, size=16384, 
    start_lbn=-3795399635254638666, len=4) at ../../../kern/vfs_cluster.c:956
#19 0xc027b5eb in cluster_write (bp=0xc5c46908, filesize=32374784, 
    seqcount=127) at ../../../kern/vfs_cluster.c:605
#20 0xc032859c in ffs_write (ap=0xcb540be0) at ../../../ufs/ffs/ffs_vnops.c:837
#21 0xc028fb22 in vn_write (fp=0xc201f8ac, uio=0xcb540c7c, 
    active_cred=0xc2370a80, flags=0, td=0xc1e72540) at vnode_if.h:417
#22 0xc0256a28 in dofilewrite (td=0xc1e72540, fp=0xc201f8ac, fd=0, 
    buf=0x804d000, nbyte=0, offset=0, flags=0) at file.h:215
#23 0xc0256869 in write (td=0xc1e72540, uap=0xcb540d10)
    at ../../../kern/sys_generic.c:329
#24 0xc03872ae in syscall (frame=
      {tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 134533120, tf_esi = 672361760, tf_ebp = -1077958920, tf_isp = -883683980, tf_ebx = 672283540, tf_edx = 672361760, tf_ecx = 672361760, tf_eax = 4, tf_trapno = 0, tf_err = 2, tf_eip = 671816083, tf_cs = 31, tf_eflags = 530, tf_esp = -1077958948, tf_ss = 47})
    at ../../../i386/i386/trap.c:1033
#25 0xc036fb2d in Xint0x80_syscall () at {standard input}:141
---Can't read userspace from dump, or kernel process---

(kgdb) quit
-- 
============================================================================
Stefan A. Deutscher                             |
Donostia International Physics Center           | office: ++34-943-018174
Universidad del Pais Vasco, Facultad de Quimica | fax   : ++34-943-015600
Departamento de Fisica de Materiales            | home  : ++34-943-270647
Apartado 1072, San Sebastian 20080, Spain       | email : sad at utk.edu
============================================================================

>Release-Note:
>Audit-Trail:
>Unformatted:
 Hi, my box doesn't seem to have sent this properly via send-pr; at least
 it didn't show up on the problem report list since may 15. So this time
 again by email from another box:
 
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 To: FreeBSD-gnats-submit at freebsd.org
 Subject: bonnie gives kernel panic in SMP but not in UNI on FBSD 5.0
 From: Stefan A. Deutscher <sad at mailaps.org>
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