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    SubjectRe: ext3: slow symlink corruption on umount...
    Some additional info -- and attempting to cast a wider
    net on the CC:

    I do not see the long symlink corruption with mount -o data=writeback
    and we've now seen a couple cases where the symlink corruption
    does not require a umount...

    Arthur

    On Fri, Oct 24, 2008 at 11:37:34AM -0700, Arthur Jones wrote:
    > Hi All, I'm seeing slow symlink corruption on ext3 on linux-2.6.27,
    > yesterday's linux-2.6 git tree and 2.6.9 RHEL4.7. I.e. every kernel
    > I've tried I see this effect. To reproduce this, I need:
    >
    > * 250MB + tar file in memory (tmpfs or in the buffer cache)
    > * long symlinks in the tar file (over 60 characters)
    > * umount immediately after untarring
    >
    > What I see is that the symlinks are corrupted, e.g.:
    >
    > # ls -l etc/vmware-vix-disklib
    > etc/vmware-vix-disklib -> ??f
    >
    > fsck shows:
    >
    > Symlink /etc/vmware-vix-disklib (inode #16454) is invalid.
    >
    > Debugfs shows:
    >
    > debugfs: stat <16454>
    > Inode: 16454 Type: symlink Mode: 0777 Flags: 0x0 Generation: 1431972005
    > User: 0 Group: 0 Size: 65
    > File ACL: 0 Directory ACL: 0
    > Links: 1 Blockcount: 8
    > Fragment: Address: 0 Number: 0 Size: 0
    > ctime: 0x4900ac69 -- Thu Oct 23 09:55:05 2008
    > atime: 0x4900ac84 -- Thu Oct 23 09:55:32 2008
    > mtime: 0x4900ac69 -- Thu Oct 23 09:55:05 2008
    > BLOCKS:
    > (0):56034
    > TOTAL: 1
    >
    > I'm still tracking down exactly what's going on. Anyone seen
    > anything like this before? ext2 does not show this effect (I've
    > not tried ext4). It happens when the backing block device is
    > a SATA drive or flash.
    >
    > Thanks,
    >
    > Arthur


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