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Date: Mon, 16 Sep 2002 12:19:17 -0400 (EDT)
From: Brad Laue <brad@brad-x.com>
Reply-To: Brad Laue <brad@brad-x.com>
To: FreeBSD-gnats-submit@FreeBSD.org
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Subject: kern/42847: panic: backgroundwritedone: lost buffer
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>Number:         42847
>Category:       kern
>Synopsis:       panic: backgroundwritedone: lost buffer
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 16 10:20:05 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Brad Laue
>Release:        FreeBSD 4.6-STABLE i386
>Organization:
brad-x.com
>Environment:
System: FreeBSD TMA-1.brad-x.com 4.6-STABLE FreeBSD 4.6-STABLE #0: Mon Aug 5 16:15:45 EDT 2002 root@TMA-1.brad-x.com:/usr/src/sys/compile/DISCOVERY-IPF i386

Copyright (c) 1992-2002 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 4.6-STABLE #0: Mon Aug  5 16:15:45 EDT 2002
    root@TMA-1.brad-x.com:/usr/src/sys/compile/DISCOVERY-IPF
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 501138847 Hz
CPU: AMD-K6(tm) 3D processor (501.14-MHz 586-class CPU)
  Origin = "AuthenticAMD"  Id = 0x58c  Stepping = 12
  Features=0x8021bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,PGE,MMX>
  AMD Features=0x80000800<SYSCALL,3DNow!>
real memory  = 402653184 (393216K bytes)
avail memory = 387641344 (378556K bytes)
Preloaded elf kernel "kernel" at 0xc0310000.
VESA: v2.0, 4096k memory, flags:0x4, mode table:0xc00c31f4 (c00031f4)
VESA: SiS
K6-family MTRR support enabled (2 registers)
Using $PIR table, 6 entries at 0xc00fdc70
npx0: <math processor> on motherboard
npx0: INT 16 interface
pcib0: <AcerLabs M1541 (Aladdin-V) PCI host bridge> on motherboard
pci0: <PCI bus> on pcib0
pcib1: <AcerLabs M5243 PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <SiS 6326 SVGA controller> at 0.0
pci0: <AcerLabs M5237 (Aladdin-V) USB controller> at 2.0 irq 12
isab0: <AcerLabs M1533 portable PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
ed0: <NE2000 PCI Ethernet (RealTek 8029)> port 0xf000-0xf01f irq 11 at device 11.0 on pci0
ed0: address 00:4f:49:0a:e8:ea, type NE2000 (16 bit) 
rl0: <D-Link DFE-530TX+ 10/100BaseTX> port 0xf400-0xf4ff mem 0xd3801000-0xd38010ff irq 10 at device 12.0 on pci0
rl0: Ethernet address: 00:50:ba:4a:52:74
miibus0: <MII bus> on rl0
rlphy0: <RealTek internal media interface> on miibus0
rlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
atapci0: <AcerLabs Aladdin ATA66 controller> port 0xf800-0xf80f at device 15.0 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
orm0: <Option ROM> at iomem 0xc0000-0xc7fff 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
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> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/1 bytes threshold
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
DUMMYNET initialized (011031)
IP packet filtering initialized, divert enabled, rule-based forwarding enabled, default to accept, logging disabled
IP Filter: v3.4.27 initialized.  Default = pass all, Logging = enabled
ad0: 76319MB <WDC WD800BB-32CCB0> [155061/16/63] at ata0-master UDMA66
acd0: CDROM <CD-ROM CDU311-Q> at ata1-master PIO3
Mounting root from ufs:/dev/ad0s1a

machine		i386
cpu		I586_CPU
ident		DISCOVERY-IPF
maxusers	0

options		NMBCLUSTERS=16384

options		IPFILTER
options		IPFILTER_LOG

#options 	MATH_EMULATE		#Support for x87 emulation
options 	INET			#InterNETworking
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
options 	NFS			#Network Filesystem
options 	COMPAT_43		#Compatible with BSD 4.3 [KEEP THIS!]
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

# 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		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

# 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

# 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
pseudo-device	snp	3           


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

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

# Serial (COM) ports
device		sio0	at isa? port IO_COM1 flags 0x10 irq 4
device		sio1	at isa? port IO_COM2 irq 3

# 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 that use the common MII bus controller code.
device		miibus		# MII bus support
device		rl		# RealTek 8129/8139

# ISA Ethernet NICs.
device		ed0	at isa? port 0x280 irq 10 iomem 0xd8000

# Pseudo devices - the number indicates how many units to allocated.
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	4	# 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

#device sbc0 at isa? port 0x220 irq 9 drq 0 flags 0x15
#device pcm 

options QUOTA
options VESA

# PPPoE

options NETGRAPH
options NETGRAPH_ETHER
options NETGRAPH_PPPOE
options NETGRAPH_SOCKET

options         IPFIREWALL         
options		IPDIVERT
options         IPFIREWALL_DEFAULT_TO_ACCEPT
options		DUMMYNET

options 	NTIMECOUNTER=20
options		HZ=1000
options		SC_HISTORY_SIZE=2048


>Description:
	System crashed after 21 days up within hours of having copied a large (200MB) file over NFS from a Linux system on a 100baseT switched network. The crash occured while another system was copying several small files to the same NFS share.

I can obtain debugging information from the system when it recurs (third time since 4.4-STABLE), but will require personal correspondence on how to set up the environment for that.

>How-To-Repeat:
	Difficult to repeat - randomly occurs when the filesystem is actively being written to.
>Fix:

Not yet known.
>Release-Note:
>Audit-Trail:
>Unformatted:

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