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    SubjectRe: 2.5.59 NFS server keeps local fs live after being stopped
    On Wednesday January 29, mikpe@csd.uu.se wrote:
    > Neil Brown writes:
    > > On Wednesday January 29, mikpe@csd.uu.se wrote:
    > > > Kernel 2.5.59. A local ext2 file system is mounted at $MNTPNT
    > > > and exported through NFS V3. A client mounts and unmounts it,
    > > > w/o any I/O in between. The NFS server is shut down. Nothing in
    > > > user-space refers to $MNTPNT.
    > > >
    > > > The bug is that $MNTPNT now can't be unmounted. umount fails with
    > > > "device is busy". A forced umount at shutdown fails with "device
    > > > or resource busy" and "illegal seek", and leaves the underlying
    > > > fs marked dirty.
    > > >
    > > > I can't say exactly when this began, but the problem is present
    > > > in 2.5.59 and 2.5.55. 2.4.21-pre4 does not have this problem.
    > >
    > > How do you shut down the nfs server?
    >
    > /etc/rc.d/init.d/nfs stop
    > which basically does a kill on rpc.mountd, nfsd, and rpc.quotad
    > (standard RH8.0 user-space)
    >
    > I've checked that all *nfs* processes are gone.
    >
    > > Is anything in /proc/fs/nfs/export after the shutdown?
    >
    > Except for the two header lines, it's empty.

    Ok, it defaintely sounds like a leak. I'll be back at my desk on
    Monday and I will try to reproduce it and explore the situation then.

    NeilBrown
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