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    SubjectRe: lazy umount not working (udev & tmpfs on /dev)
    On Tue, Oct 05, 2004 at 01:11:33PM +0300, Meelis Roos wrote:
    > Hi, I'm running 2.6.9-rc3+BK (as of yesterday, 20041004) on a couple of
    > x86 Debian unstable machines with udev and I'm having problems.
    > In 2.6.3-rc2 all was OK. Don't know exactly about plain -rc3.
    > In current BK, lazy umount is not working sometimes. udev start script
    > mounts tmpfs on /dev and stop script does umount -l /dev. This doesn't
    > return failure but nothing happens, /dev remain mounted and I can't

    It might be not umount, actually - if you get double mount for any
    reason, the first umount -l will strip the top layer, leaving whatever's
    beneath it.

    Could you add printk to sys_mount() and sys_umount(), so that
    we could at least see which one is a problem? Just "called mount"/"called
    umount", nothing fancy with arguments...
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