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Date:      Mon, 10 Mar 2003 09:51:42 -0800 (PST)
From:      Martin Machacek <m@m3a.net>
To:        FreeBSD-gnats-submit@FreeBSD.org
Subject:   kern/49079: panic: bwrite: buffer is not busy
Message-ID:  <20030310175142.B2BAB431A@pivo.mm.lab>

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>Number:         49079
>Category:       kern
>Synopsis:       panic: bwrite: buffer is not busy
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Mar 10 10:00:24 PST 2003
>Closed-Date:
>Last-Modified:
>Originator:     Martin Machacek
>Release:        FreeBSD 5.0-RELEASE i386
>Organization:
>Environment:
System: FreeBSD pivo.mm.lab 5.0-RELEASE FreeBSD 5.0-RELEASE #0: Fri Mar 7 09:15:41 PST 2003 root@pivo.mm.lab:/usr/src/sys/i386/compile/PIVO i386

>Description:
The system panics with "panic: bwrite: buffer is not busy" after random time
after boot if X server is running (although this is not verified to be
necessary) and there is lot of disk activity. It has repeatedly happend during
daily periodic check (I'm using xdm, so X server is running all the time).
Note: I had to use "DISABLE_PSE" and "DISABLE_PG_G" to prevent applications
being killed by SIGILL on this machine. Stack backtrace taken from latest
crashdump follows:

mm@pivo:/var/crash# gdb -k -c vmcore.1 /sys/i386/compile/PIVO/kernel.debug
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:
---
panic: ufs_dirbad: bad dir

syncing disks, buffers remaining... panic: bwrite: buffer is not busy???
Uptime: 2d23h32m45s
Dumping 511 MB
ata0: resetting devices ..
done
 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 256 272 288 304 320 336 352 368 384 400 416 432 448 464 480 496
---
#0  doadump () at ../../../kern/kern_shutdown.c:232
232             dumping++;
(kgdb) bt
#0  doadump () at ../../../kern/kern_shutdown.c:232
#1  0xc0237e60 in boot (howto=260) at ../../../kern/kern_shutdown.c:364
#2  0xc023806d in poweroff_wait (junk=0xc03d27e3, howto=-834382628)
    at ../../../kern/kern_shutdown.c:517
#3  0xc0273237 in bwrite (bp=0x104) at ../../../kern/vfs_bio.c:796
#4  0xc027470c in vfs_bio_awrite (bp=0xce445430)
    at ../../../kern/vfs_bio.c:1643
#5  0xc0343872 in ffs_fsync (ap=0xe0b45860) at ../../../ufs/ffs/ffs_vnops.c:258
#6  0xc0342aff in ffs_sync (mp=0xc3dff800, waitfor=2, cred=0xc1293e80, 
    td=0xc0424200) at vnode_if.h:612
#7  0xc0285669 in sync (td=0xc0424200, uap=0x0)
    at ../../../kern/vfs_syscalls.c:138
#8  0xc0237acc in boot (howto=256) at ../../../kern/kern_shutdown.c:273
#9  0xc023806d in poweroff_wait (junk=0xc03df15d, howto=-1007009616)
    at ../../../kern/kern_shutdown.c:517
#10 0xc034a499 in ufs_dirbad (ip=0x0, offset=0, how=0x0)
    at ../../../ufs/ufs/ufs_lookup.c:631
#11 0xc03499eb in ufs_lookup (ap=0xe0b45ac0)
    at ../../../ufs/ufs/ufs_lookup.c:294
#12 0xc0350cba in ufs_vnoperate (ap=0x0) at ../../../ufs/ufs/ufs_vnops.c:2796
#13 0xc0277e23 in vfs_cache_lookup (ap=0x0) at vnode_if.h:82
#14 0xc0350cba in ufs_vnoperate (ap=0x0) at ../../../ufs/ufs/ufs_vnops.c:2796
#15 0xc027bebe in lookup (ndp=0xe0b45c28) at vnode_if.h:52
#16 0xc027b8d7 in namei (ndp=0xe0b45c28) at ../../../kern/vfs_lookup.c:181
#17 0xc02880ba in lstat (td=0xc40b38c0, uap=0xe0b45d14)
    at ../../../kern/vfs_syscalls.c:1699
#18 0xc0393807 in syscall (frame=
      {tf_fs = 134938671, tf_es = 134873135, tf_ds = 136052783, tf_edi = 135978656, tf_esi = 134876304, tf_ebp = 135977844, tf_isp = -525050508, tf_ebx = 136346664, tf_edx = 0, tf_ecx = 0, tf_eax = 190, tf_trapno = 22, tf_err = 2, tf_eip = 672664659, tf_cs = 31, tf_eflags = 582, tf_esp = 135977708, tf_ss = 47})
    at ../../../i386/i386/trap.c:1033
#19 0xc03849fd in Xint0x80_syscall () at {standard input}:140
---Can't read userspace from dump, or kernel process---

dmesg:

mm@pivo:/var/crash# cat /var/run/dmesg.boot 
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: Fri Mar  7 09:15:41 PST 2003
    root@pivo.mm.lab:/usr/src/sys/i386/compile/PIVO
Preloaded elf kernel "/boot/kernel/kernel" at 0xc0565000.
Preloaded elf module "/boot/kernel/acpi.ko" at 0xc05650a8.
Timecounter "i8254"  frequency 1193182 Hz
Timecounter "TSC"  frequency 1793363468 Hz
CPU: Pentium 4 (1793.36-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0xf24  Stepping = 4
  Features=0x3febfbff<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>
real memory  = 536285184 (511 MB)
avail memory = 515149824 (491 MB)
Initializing GEOMetry subsystem
Pentium Pro MTRR support enabled
npx0: <math processor> on motherboard
npx0: INT 16 interface
acpi0: <DELL   GX260  > on motherboard
    ACPI-0625: *** Info: GPE Block0 defined as GPE0 to GPE31
Using $PIR table, 9 entries at 0xc00feae0
acpi0: power button is handled as a fixed feature programming model.
Timecounter "ACPI-fast"  frequency 3579545 Hz
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_cpu0: <CPU> on acpi0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
agp0: <Intel Generic host to PCI bridge> mem 0xe8000000-0xefffffff at device 0.0 on pci0
pcib1: <PCIBIOS PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
drm0: <ATI Radeon QY VE (AGP)> port 0xec00-0xecff mem 0xff8f0000-0xff8fffff,0xf0000000-0xf7ffffff irq 11 at device 0.0 on pci1
info: [drm] AGP at 0xe8000000 128MB
info: [drm] Initialized radeon 1.1.1 20010405 on minor 0
uhci0: <Intel 82801DB (ICH4) USB controller USB-A> port 0xff80-0xff9f irq 11 at device 29.0 on pci0
usb0: <Intel 82801DB (ICH4) USB controller USB-A> 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
ums0: Logitech USB Optical Mouse, rev 1.10/21.10, addr 2, iclass 3/1
ums0: 3 buttons and Z dir.
uhci1: <Intel 82801DB (ICH4) USB controller USB-B> port 0xff60-0xff7f irq 10 at device 29.1 on pci0
usb1: <Intel 82801DB (ICH4) USB controller USB-B> 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: <Intel 82801DB (ICH4) USB controller USB-C> port 0xff40-0xff5f irq 9 at device 29.2 on pci0
usb2: <Intel 82801DB (ICH4) USB controller USB-C> 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
pci0: <serial bus, USB> at device 29.7 (no driver attached)
pcib2: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci2: <ACPI PCI bus> on pcib2
xl0: <3Com 3c905C-TX Fast Etherlink XL> port 0xdc80-0xdcff mem 0xff6ffc00-0xff6ffc7f irq 9 at device 9.0 on pci2
xl0: Ethernet address: 00:01:02:2e:46:78
miibus0: <MII bus> on xl0
xlphy0: <3c905C 10/100 internal PHY> on miibus0
xlphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
em0: <Intel(R) PRO/1000 Network Connection, Version - 1.4.7> port 0xdc40-0xdc7f mem 0xff6c0000-0xff6dffff irq 9 at device 12.0 on pci2
em0:  Speed:100 Mbps  Duplex:Full
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH4 ATA100 controller> port 0xffa0-0xffaf,0-0x3,0-0x7,0-0x3,0-0x7 at device 31.1 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
pci0: <serial bus, SMBus> at device 31.3 (no driver attached)
pcm0: <Intel 82801DB (ICH4)> port 0xcc40-0xcc7f,0xc800-0xc8ff mem 0xffa20000-0xffa200ff,0xffa20400-0xffa205ff irq 11 at device 31.5 on pci0
speaker0 port 0x61 on acpi0
fdc0: <Enhanced floppy controller (i82077, NE72065 or clone)> port 0x3f7,0x3f0-0x3f5 irq 6 drq 2 on acpi0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
atkbdc0: <Keyboard controller (i8042)> port 0x64,0x60 irq 1 on acpi0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
sio0 port 0x3f8-0x3ff irq 4 on acpi0
sio0: type 16550A
orm0: <Option ROMs> at iomem 0xcb800-0xcbfff,0xcb000-0xcb7ff,0xc0000-0xcafff on isa0
pmtimer0 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
Timecounters tick every 10.000 msec
ad0: 19595MB <MAXTOR 6L020J1> [39813/16/63] at ata0-master UDMA100
acd0: CDROM <SAMSUNG CD-ROM SC-148C> at ata1-master PIO4
Mounting root from ufs:/dev/ad0s3a
WARNING: / was not properly dismounted
WARNING: /usr was not properly dismounted
/usr: mount pending error: blocks 12 files 3
/usr: superblock summary recomputed

kernel config:


machine		i386
cpu		    I686_CPU
ident		PIVO
maxusers	0

makeoptions     DEBUG=-g

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 	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     DISABLE_PSE
options 	DISABLE_PG_G

# Debugging for use in -current
options 	DDB			    #Enable the kernel debugger
#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

device		isa
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 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)

# 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		sc
device		agp		    # support several AGP chipsets
device		npx

device      radeondrm

# 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

device		pcm

# 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

# Pseudo devices - the number indicates how many units to allocate.
device		random		# Entropy device
device		loop		# Network loopback
device		ether		# Ethernet support
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
device      speaker

# USB support
device		uhci		# UHCI PCI->USB interface
device		ohci		# OHCI PCI->USB interface
device		usb		# USB Bus (required)
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

The kernel was compiled with following options in /etc/make.conf:

# -- use.perl generated deltas -- #
# Created: Wed Feb 12 18:58:20 2003
# Setting to use base perl from ports:
CPUTYPE=p4
PERL_VER=5.6.1
PERL_VERSION=5.6.1
PERL_ARCH=mach
NOPERL=yo
NO_PERL=yo
NO_PERL_WRAPPER=yo
SUP_UPDATE=yo
KERNCONF=PIVO GENERIC
NO_BIND=yo
NO_SENDMAIL=yo

XFree version:

XFree86 Version 4.2.1 / X Window System
(protocol Version 11, revision 0, vendor release 6600)
Release Date: 3 September 2002
        If the server is older than 6-12 months, or if your card is
        newer than the above date, look for a newer version before
        reporting problems.  (See http://www.XFree86.Org/)
Build Operating System: FreeBSD 5.0-RC i386 [ELF] 
Module Loader present

XF86Config:


Section "ServerLayout"
	Identifier     "XFree86 Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	RgbPath      "/usr/X11R6/lib/X11/rgb"
	ModulePath   "/usr/X11R6/lib/modules"
	FontPath     "/usr/X11R6/lib/X11/fonts/TTF/"
	FontPath     "/usr/X11R6/lib/X11/fonts/misc/"
	FontPath     "/usr/X11R6/lib/X11/fonts/Speedo/"
	FontPath     "/usr/X11R6/lib/X11/fonts/Type1/"
	FontPath     "/usr/X11R6/lib/X11/fonts/75dpi/"
	FontPath     "/usr/X11R6/lib/X11/fonts/100dpi/"
EndSection

Section "Module"
	Load  "dbe"
	Load  "dri"
	Load  "extmod"
	Load  "glx"
	Load  "pex5"
	Load  "record"
	Load  "xie"
	Load  "xtrap"
	Load  "speedo"
	Load  "type1"
    Load  "freetype"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "keyboard"
    Option      "XkbModel"   "pc104"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/sysmouse"
    Option      "Buttons"    "5"
    Option      "ZAxisMapping"    "4 5"
EndSection

Section "Monitor"
	#DisplaySize	  400   300	# mm
	Identifier   "Monitor0"
	VendorName   "VSC"
	ModelName    "G810-3"
	HorizSync    30-97
	VertRefresh  50-180
	Option	    "DPMS"
EndSection

Section "Device"
	Identifier  "Card0"
	Driver      "ati"
	VendorName  "ATI"
	BoardName   "Radeon VE QY"
	BusID       "PCI:1:0:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	DefaultDepth 24
	SubSection "Display"
		Depth     16
		Modes "1280x1024"
	EndSubSection
	SubSection "Display"
		Depth     24
		Modes "1280x1024"
	EndSubSection
EndSection


>How-To-Repeat:

Run 5.0-RELEASE Kernel and XFree86 Version 4.2.1 X server, induce lot of disk
activity (such as deep find, filesystem dump, etc. ..). The problem is not
deterministically repeatable but occurs pretty frequently (once an hour - once in 3 days).

>Fix:

Would love to have one :-).
>Release-Note:
>Audit-Trail:
>Unformatted:

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