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    SubjectRegular ext4 error warning with HD in USB dock
    Date
    Hi all

    Since I moved my internal HD into a USB dock externally and mount the ext4
    filesystem on it, I regularly get the following errors after it has been
    mounted for a while (see timecode). It doesn't seem to matter which recent
    kernel I use.


    [1048401.773270] EXT4-fs (sde8): mounted filesystem with writeback data mode.
    Opts: (null)
    [1048702.736011] EXT4-fs (sde8): error count: 3
    [1048702.736016] EXT4-fs (sde8): initial error at 1289053677:
    ext4_journal_start_sb:251
    [1048702.736018] EXT4-fs (sde8): last error at 1289080948: ext4_put_super:719

    I've forced an fs check numerous times but nothing comes up. There was only
    one occasion where the filesystem mounted RO but that was months ago and has
    since been fine.

    This does not appear to cause any actual problems and happens it seems at
    _precisely_ the moment the hard drive decides to go into sleep mode as I hear
    it spin down. hdparm is unable to extract details from the hard drive when it
    is plugged into the usb dock.



    The options used on this are as follows:
    tune2fs 1.41.12 (17-May-2010)
    Filesystem volume name: backup
    Last mounted on: /media/backup
    Filesystem UUID: 4eff5eb7-89fb-4db1-8cfd-f09db598a00b
    Filesystem magic number: 0xEF53
    Filesystem revision #: 1 (dynamic)
    Filesystem features: has_journal ext_attr resize_inode dir_index filetype
    needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg
    dir_nlink extra_isize
    Filesystem flags: signed_directory_hash
    Default mount options: journal_data_writeback
    Filesystem state: clean
    Errors behavior: Continue
    Filesystem OS type: Linux
    Inode count: 22593536
    Block count: 90355576
    Reserved block count: 0
    Free blocks: 30330219
    Free inodes: 21828725
    First block: 0
    Block size: 4096
    Fragment size: 4096
    Reserved GDT blocks: 1002
    Blocks per group: 32768
    Fragments per group: 32768
    Inodes per group: 8192
    Inode blocks per group: 512
    Flex block group size: 16
    Filesystem created: Fri Jun 19 22:38:36 2009
    Last mount time: Tue Dec 28 09:36:34 2010
    Last write time: Tue Dec 28 09:36:34 2010
    Mount count: 8
    Maximum mount count: -1
    Last checked: Sun Dec 19 21:50:05 2010
    Check interval: 0 (<none>)
    Lifetime writes: 1992 GB
    Reserved blocks uid: 0 (user root)
    Reserved blocks gid: 0 (group root)
    First inode: 11
    Inode size: 256
    Required extra isize: 28
    Desired extra isize: 28
    Journal inode: 8
    Default directory hash: half_md4
    Directory Hash Seed: 5cdfe619-0de5-4bcd-85d2-5fa5f4f13da7
    Journal backup: inode blocks


    lsusb
    Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 002 Device 008: ID 046d:c70a Logitech, Inc. MX5000 Cordless Desktop
    Bus 002 Device 007: ID 046d:c70e Logitech, Inc. MX1000 Bluetooth Laser Mouse
    Bus 002 Device 006: ID 0424:2228 Standard Microsystems Corp. 9-in-2 Card
    Reader
    Bus 002 Device 005: ID 046d:0b02 Logitech, Inc. BT Mini-Receiver (HID proxy
    mode)
    Bus 002 Device 004: ID 04b8:012c Seiko Epson Corp. Perfection V350 (GT-F700)
    Bus 002 Device 003: ID 0424:2602 Standard Microsystems Corp. USB 2.0 Hub
    Bus 002 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
    Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 001 Device 003: ID 1759:5000 LucidPort Technology, Inc.
    Bus 001 Device 002: ID 1058:1100 Western Digital Technologies, Inc.
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

    lspci
    00:00.0 Host bridge: Intel Corporation 82P965/G965 Memory Controller Hub (rev
    02)
    00:01.0 PCI bridge: Intel Corporation 82P965/G965 PCI Express Root Port (rev
    02)
    00:1a.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
    Controller #4 (rev 02)
    00:1a.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
    Controller #5 (rev 02)
    00:1a.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
    Controller #2 (rev 02)
    00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
    Controller (rev 02)
    00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1
    (rev 02)
    00:1c.3 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 4
    (rev 02)
    00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5
    (rev 02)
    00:1d.0 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
    Controller #1 (rev 02)
    00:1d.1 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
    Controller #2 (rev 02)
    00:1d.2 USB Controller: Intel Corporation 82801H (ICH8 Family) USB UHCI
    Controller #3 (rev 02)
    00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI
    Controller #1 (rev 02)
    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev f2)
    00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface
    Controller (rev 02)
    00:1f.2 SATA controller: Intel Corporation 82801HB (ICH8) 4 port SATA AHCI
    Controller (rev 02)
    00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev
    02)
    01:00.0 VGA compatible controller: nVidia Corporation G96 [GeForce 9400 GT]
    (rev a1)
    02:00.0 SATA controller: JMicron Technology Corp. JMB362/JMB363 Serial ATA
    Controller (rev 02)
    02:00.1 IDE interface: JMicron Technology Corp. JMB362/JMB363 Serial ATA
    Controller (rev 02)
    03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI
    Express Gigabit Ethernet controller (rev 01)
    05:02.0 Multimedia video controller: Brooktree Corporation Bt878 Video Capture
    (rev 11)
    05:02.1 Multimedia controller: Brooktree Corporation Bt878 Audio Capture (rev
    11)


    Pointers would be appreciated, even if it's just "it's harmless, ignore it".

    Thanks,
    Con
    --
    -ck


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