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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