Date: Thu, 12 Jun 1997 08:59:10 -0400 (EDT) From: Thomas David Rivers <ponds!rivers@dg-rtp.dg.com> To: dfr@nlsystems.com, ponds!polstra.com!jdp Cc: ponds!hub.freebsd.org!freebsd-bugs Subject: Re: kern/3771 NFS hangs when writing to local FS re-mounted via NFS Message-ID: <199706121259.IAA01024@lakes.water.net>
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> > On Wed, 4 Jun 1997, John Polstra wrote: > > > The following reply was made to PR kern/3771; it has been noted by GNATS. > > > > From: John Polstra <jdp@polstra.com> > > To: freebsd-gnats-submit@freebsd.org > > Cc: Chris Timmons <skynyrd@opus.cts.cwu.edu> > > Subject: Re: kern/3771 NFS hangs when writing to local FS re-mounted via NFS > > Date: Wed, 04 Jun 1997 07:40:47 -0700 > > > > > mount localhost:/ mnt > > > cp /mnt/tmp/junkfile /tmp/junkfile.copy [this works ok > > > cp /tmp/junkfile /mnt/tmp/junkfile.dead [this hangs the system] > > > > Chris Timmons has pointed out in private mail that this looks like > > it might be caused by a more general problem with the loopback > > interface that I and others have noticed. Could you please try > > the same test again, but using your real host name instead of > > "localhost" for the mount? > > There is a deadly embrace style deadlock when you loopback mount a > filesystem using NFSv3. I don't plan to try and fix this since I don't > think loopback mounts are useful other than for trivial testing. > Ahh... but if you were doing something like "alex" - say to get to RCS/CVS files via a locally mounted NFS (user-mode) server.... then, this could be important. I just wanted to point out that the issue isn't as straight-forward as simply reading local files, there may be some name -> file translation going on in an NFS server... - Dave Rivers -
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