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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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