Date: Tue, 16 Mar 1999 12:52:32 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Pierre Beyssac <beyssac@enst.fr> Cc: freebsd-current@FreeBSD.ORG Subject: Re: panic: vfs_busy: unexpected lock failure Message-ID: <199903162052.MAA12300@apollo.backplane.com> References: <19990315174734.A400@enst.fr> <199903152124.NAA02779@apollo.backplane.com> <19990316111040.A384@enst.fr> <199903161911.LAA11778@apollo.backplane.com> <19990316213355.A4561@enst.fr>
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:On Tue, Mar 16, 1999 at 11:11:44AM -0800, Matthew Dillon wrote:
:> (cnp->cn_flags & NOCROSSMOUNT) == 0) {
:> if (vfs_busy(mp, 0, 0, p))
:> continue;
:...
:> You shouldn't be crossing a mount point. Are you by chance doing a
:> recursive copy onto itself?
:> e.g. cp -rp src dest where dest is mounted under src somewhere ?
:
:No. At first it was from a NFS-mounted volume to another NFS-mounted
:volume. I then found that it panic'ed the same when I copied from
:a local FFS volume to the same NFS volume.
:
:The NFS volumes are automounted by amd under /a. That may well have
:something to do with the panic: that's a recent change in my
:configuration; I previously used NFS mounts in /etc/fstab which
:didn't cause me any trouble.
:
:> Of course, it is still a serious kernel bug. I would like to try
:> to reproduce it in order to track it down. How are things mounted on
:> your system ( df ) and what are the *exact* arguments you are using with
:> cp?
:
:Here's the df (I removed some of the amd dummy mount points).
:
:$ df
:Filesystem 1K-blocks Used Avail Capacity Mounted on
:/dev/wd0s1a 49583 34595 11022 76% /
:/dev/wd1s1e 5975845 3556146 1941632 65% /home
:/dev/wd0s1f 148823 1290 135628 1% /tmp
:/dev/wd0s1g 5380597 1615221 3334929 33% /usr
:/dev/wd0s1e 396895 38127 327017 10% /var
:procfs 4 4 0 100% /proc
:[ ten pid156@bofh:/xyz lines removed ]
:pid156@bofh:/cal 0 0 0 100% /cal
:huuh:/home/huuh 1217519 1064153 141191 88% /a/huuh/home/huuh
:
:The failing cp is:
:
:$ cp -rp /home/beyssac/src/sendmail-8.9.3/cf/ /home/beyssac/nfs/junk/
:
:In the above, "/home/beyssac/nfs" is a symbolic link to
:/cal/huuh/cal/beyssac which is automounted by amd (last line in
:the above df).
:--
:Pierre Beyssac pb@enst.fr
Ahhhh.. And if you make those AMD mounts normal nfs mounts it doesn't
fry? If so, then we have a bug in AMD somewhere.
-Matt
Matthew Dillon
<dillon@backplane.com>
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