i386/74816: OS crash with kernel trap 12 in different processes

[Elifant'ev Oleg]

>Number:         74816
>Category:       i386
>Synopsis:       OS crash with kernel trap 12 in different processes
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Dec 07 14:50:25 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Elifant'ev Oleg
>Release:        FreeBSD 5.2-Release, 5.2.1-Release
>Organization:
A-Real
>Environment:
FreeBSD test_s_intel.a-real.ru 5.2-RELEASE FreeBSD 5.2-RELEASE #0: Mon Dec  6 18:28:04 MSK 2004     root at test_s_intel.a-real.ru:/usr/src/sys/i386/compile/GATE  i386     
>Description:
I have a test network. Network has computers A,B and C.
A is a "downloader". It downloads web sites from computer C by using wget in infinite loop. Computer B is a router between theese networks (NAT is used).
Computer "A" have Apache 2.0.48, MySQL 4.0.20, PHP 4.3.4 installed.
Hardware of computer A is
Intel D845GVSRL i845 chipset motherboard
CPU intel celeron 1.8
Mem 128 Mb, pc2700 DDR
Network - Intel 10/100 card (em driver)

hardware is not overclocked and work on system default (auto) frequencies and timings.

Kernel Configuration (made from GENERIC)
----------------------------------------
machine		i386
#cpu		I486_CPU
cpu		I586_CPU
cpu		I686_CPU
ident		GENERIC

#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 	SCHED_4BSD		#4BSD scheduler
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 /, 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=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 	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 	INVARIANT_SUPPORT	#Extra sanity checks of internal structures, required by INVARIANTS

options		IPFIREWALL
options		IPFIREWALL_DEFAULT_TO_ACCEPT
options		IPDIVERT	 # for nat
options		DUMMYNET	 # for bandwidth limitating
options     RANDOM_IP_ID # generates randon ip id field
options		IPSEC
options		IPSEC_ESP

options		DEVICE_POLLING

options		HZ=1000		# more accurate clock

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

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		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		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

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

# 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

# If you've got a "dumb" serial or parallel PCI card that is
# supported by the puc(4) glue driver, uncomment the following
# line to enable it (connects to the sio and/or ppc drivers):
#device         puc

# 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		bfe		# Broadcom BCM440x 10/100 ethernet
device		bge		# Broadcom BCM570xx Gigabit Ethernet
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		re		# RealTek 8139C+/8169/8169S/8110S
device		rl		# RealTek 8129/8139
device		sf		# Adaptec AIC-6915 (``Starfire'')
device		sis		# Silicon Integrated Systems SiS 900/SiS 7016
device		sk		# SysKonnect SK-984x and SK-982x gigabit ethernet
device		ste		# Sundance ST201 (D-Link DFE-550TX)
device		ti		# Alteon Networks Tigon I/II gigabit ethernet
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'')

# 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

this is a final kernel configuration. Before that i have enabled IPV6, sio, SMP and HZ=100 option. Under that config i have this crashes too.

Under heavy load computer A crashes with kernel panic trap 12 message after random time (from 3 till 12 hours of normal work) in different processes such 
intn: em0, swi8: tty: sio clock, swin: clock.
(because crash in "swi8... sio clock" sio device was disabled)

while trying to kill this trouble system memory timings was decreased but this does'nt solve a problem :(


>How-To-Repeat:
      
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: