Date: Wed, 4 Jun 1997 16:39:37 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: John Polstra <jdp@polstra.com> Cc: freebsd-bugs@hub.freebsd.org Subject: Re: kern/3771 NFS hangs when writing to local FS re-mounted via NFS Message-ID: <Pine.BSF.3.95q.970604163815.394D-100000@herring.nlsystems.com> In-Reply-To: <199706041450.HAA01780@hub.freebsd.org>
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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. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 951 1891 Fax: +44 181 381 1039
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