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Date:      Fri, 8 Dec 2006 21:18:13 GMT
From:      Lukas Turek<turek@ksvi.mff.cuni.cz>
To:        freebsd-gnats-submit@FreeBSD.org
Subject:   kern/106496: Can't remount filesystem as read only after delete - Failed to flush worklist
Message-ID:  <200612082118.kB8LIDUu023120@www.freebsd.org>
Resent-Message-ID: <200612082120.kB8LK6bD027484@freefall.freebsd.org>

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>Number:         106496
>Category:       kern
>Synopsis:       Can't remount filesystem as read only after delete - Failed to flush worklist
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Dec 08 21:20:05 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Lukas Turek
>Release:        6.2-RC1
>Organization:
Praha12.Net
>Environment:
FreeBSD bonsai.praha12.czf 6.2-RC1 FreeBSD 6.2-RC1 #2: Sat Dec  2 06:14:56 CET 2006     x8an@javor.praha12.czf:/data/local/obj/data/local/src/sys/REDDEVIL4  i386
>Description:
I have root filesystem mounted as read only, /var and /tmp is on ramdisk. When I remount the filesystem as rw, delete some file and then mount it ro, it fails with 
mount: /dev/ad0s1a: Device busy

This message appears in dmesg:
softdep_waitidle: Failed to flush worklist for 0xc363bcf8

Another remount causes the same result (with the same addres in dmesg). fsck on the partition causes complete freeze of system.

It seems waiting for a minute before remount helps.

This is my kernel configuration:

#
# 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 1.429.2.3 2005/09/22 12:36:38 kensmith Exp $

machine         i386
#cpu            I486_CPU
cpu             I586_CPU
cpu             I686_CPU
ident           REDDEVIL

# 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_ULE               # ULE scheduler
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         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         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        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.
options         ADAPTIVE_GIANT          # Giant mutex is adaptive.

options         CPU_GEODE               # For WRAP
options         SW_WATCHDOG             # Software Watchdog

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         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          kbdmux          # keyboard multiplexer

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         pccard          # PC Card (16-bit) bus
#device         cardbus         # CardBus (32-bit) bus

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

# 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         ixgb            # Intel PRO/10GbE 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          bce             # Broadcom BCM5706/BCM5708 Gigabit Ethernet
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         lge             # Level 1 LXT1001 gigabit Ethernet
#device         nge             # NatSemi DP83820 gigabit Ethernet
device          nve             # nVidia nForce MCP on-board Ethernet Networking
#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 & 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         vge             # VIA VT612x gigabit Ethernet
device          vr              # VIA Rhine, Rhine II
#device         wb              # Winbond W89C840F
device          xl              # 3Com 3c90x (``Boomerang'', ``Cyclone'')
device          ed              # NE[12]000, SMC Ultra, 3c503, DS8390 cards

# Wireless NIC cards
device          wlan            # 802.11 support
#device         an              # Aironet 4500/4800 802.11 wireless NICs.
#device         awi             # BayStack 660 and others
#device         ral             # Ralink Technology RT2500 wireless NICs.
device          wi              # WaveLAN/Intersil/Symbol 802.11 wireless NICs.
#device         wl              # Older non 802.11 Wavelan wireless NIC.

# Pseudo devices.
device          loop            # Network loopback
device          random          # Entropy device
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!
# Note that 'bpf' is required for DHCP.
device          bpf             # Berkeley packet filter

# USB support
device          uhci            # UHCI PCI->USB interface
device          ohci            # OHCI PCI->USB interface
device          ehci            # EHCI PCI->USB interface (USB 2.0)
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          scbus           # SCSI bus (required for SCSI)
device          da              # Direct Access (disks)
device          ums             # Mouse
#device         ural            # Ralink Technology RT2500USB wireless NICs
#device         urio            # Diamond Rio 500 MP3 player
#device         uscanner        # Scanners

#####################################################

# FIREWALL
options         HZ=1000
options         IPFIREWALL
options         IPFIREWALL_VERBOSE
options         IPFIREWALL_VERBOSE_LIMIT=10
options         IPFIREWALL_DEFAULT_TO_ACCEPT
options         IPDIVERT
options         IPSTEALTH
options         DUMMYNET
options         BRIDGE

# Atheros
device          ath
device          ath_hal
device          ath_rate_sample # SampleRate rate control for the ath driver

# WLAN encryption
device          wlan_wep
device          wlan_ccmp
device          wlan_tkip
device          wlan_xauth
device          wlan_acl

options         DEVICE_POLLING
options         INCLUDE_CONFIG_FILE

>How-To-Repeat:
#Mount R/W, noatime is not needed to cause the problem
mount -o noatime -uw /

#Remove any already existing file (touch something && rm something does not work)
rm /etc/resolv.conf

#Mount R/O, noatime is not needed to cause the problem
mount -o noatime -ur /
#Result: Device Busy

#Backgroung fsck
fsck -B -f -y /
#Result: freeze


>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:



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