netdev - Re: [NFS] problems with lockd in 2.6.22.6

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Message-Id: <200709072005.28802.wolfgang.walter@studentenwerk.mhn.de>
Date:	Fri, 7 Sep 2007 20:05:28 +0200
From:	Wolfgang Walter <wolfgang.walter@...dentenwerk.mhn.de>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	neilb@...e.de, netdev@...r.kernel.org, nfs@...ts.sourceforge.net
Subject: Re: [NFS] problems with lockd in 2.6.22.6

Am Freitag, 7. September 2007 18:19 schrieben Sie:
> On Fri, Sep 07, 2007 at 05:49:55PM +0200, Wolfgang Walter wrote:
> > Hello,
> >
> > we upgraded the kernel of a nfs-server from 2.6.17.11 to 2.6.22.6. Since
> > then we get the message
> >
> > lockd: too many open TCP sockets, consider increasing the number of nfsd
> > threads lockd: last TCP connect from ^\\236^\É^D

> >
> > 2) The number of nfsd threads we are running on the machine is 1024.
> > So this is not the problem. It seems, though, that in the case of
> > lockd svc_tcp_accept does not check the number of nfsd threads but the
> > number of lockd threads which is one.  As soon as the number of open
> > lockd sockets surpasses 80 this message gets logged.  This usually
> > happens every evening when a lot of people shutdown their workstation.
>
> So to be clear: there's not an actual problem here other than that the
> logs are getting spammed?  (Not that that isn't a problem in itself.)
>

When more than 80 nfs clients try to lock files at the same time then it
probably would.

> > 3) For unknown reason these sockets then remain open. In the morning
> > when people start their workstation again we therefor not only get a
> > lot of these messages again but often the nfs-server does not properly
> > work any more. Restarting the nfs-daemon is a workaround.
>
> Hm, thanks.
>

I don't know if the lockd thing is the reason, though.

2.6.22.6 per se runs stable (no oops, no crash etc) but kernel nfs seems
to be a little bit unstable. 2.6.17.11 run for months without any nfsd-related 
problems whereas in 2.6.22.6 nfs needs to be restarted almost every day. 
Sometimes this fails with

lockd_down: lockd failed to exit, clearing pid
nfsd: last server has exited
nfsd: unexporting all filesystems
lockd_up: makesock failed, error=-98

after which the server must be rebooted.

I think there is something with lockd because there are no problems over the 
day. It is in the morning when a lot of people log into their machines and 
start their desktops (I think kde locks its config files when it reads them).

Regards
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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