Re: [NFS] Help! NFS broken

["J. Bruce Fields" <bfields@fieldses.org>]

On Sun, Dec 07, 2008 at 06:48:52AM -0800, mike wrote:
> I upgraded my Ubuntu Hardy server to Intrepid the night before last.
> When I woke up yesterday morning, my main server I use as my ssh
> gateway into the others was totally messed up.
> 
> My server is FreeBSD. I haven't had to touch it since I set it up.
> 
> My clients are 6 Ubuntu servers. All are identical in packages,
> configs (I diff'ed /etc), kernel versions, network setup, etc.

So the "server" in the first paragraph is an NFS client, and its NFS
server is the FreeBSD machine?

And what are the first symptoms?  Any threads accessing the NFS
filesystem just hang?  A sysrq-T trace on the client showing where
they're hanging might be helpful.

--b.

> 
> Only *one* of the machines is suffering (and of course, one of the
> most important ones) - and it isn't even one of the busiest.
> 
> I've tried downgrading the kernel on the box suffering the issue from
> 2.6.27-10 to 2.6.27-7, my next attempt will be picking a kernel .deb
> that was from the previous Ubuntu release...
> 
> What is odd is that it works great after reboot and lasts for a couple
> hours, then stops working. I can umount -l /home and then try to
> remount it (see below) but it never gets anywhere and eventually dies
> with a generic message. I tried to strace -f it, and it gave me
> nothing to work with. The FreeBSD server doesn't give me anything in
> logs to go off of either. I can ping and ssh between the two no
> problem at this point still. It's just NFS that is odd. Also I did
> notice trying to restart services manually and try to debug them that
> portmap seemed to throw a kernel error in my logs once in a while. But
> I don't get a connection to portmap when I run the mount command, and
> I would assume if portmap is required for mounting NFS shares that it
> would need to contact it. That could totally be irrelevant though.
> 
> Any help or insight or request for additional information is
> appreciated. On-list or off-list is fine. I will pay someone via
> Paypal who can help me resolve this quickly...
> 
> [root@lvs01 ~]# mount -vvvv /home
> mount: fstab path: "/etc/fstab"
> mount: mtab path:  "/etc/mtab"
> mount: lock path:  "/etc/mtab~"
> mount: temp path:  "/etc/mtab.tmp"
> mount: spec:  "raid01:/home"
> mount: node:  "/home"
> mount: types: "nfs"
> mount: opts:  "rsize=8192,rsize=8192,tcp,rw,acregmin=30"
> mount: external mount: argv[0] = "/sbin/mount.nfs"
> mount: external mount: argv[1] = "raid01:/home"
> mount: external mount: argv[2] = "/home"
> mount: external mount: argv[3] = "-v"
> mount: external mount: argv[4] = "-o"
> mount: external mount: argv[5] = "rw,rsize=8192,rsize=8192,tcp,acregmin=30"
> mount.nfs: timeout set for Sun Dec  7 06:36:39 2008
> mount.nfs: text-based options:
> 'rsize=8192,rsize=8192,tcp,acregmin=30,addr=10.13.220.94'
> (just stalls here, normally a connection is near instant. eventually
> it will die with a generic error message. i can control-C to quit it
> too, so it's not frozen completely)
> 
> 
> 
> thanks...
> 
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