9-STABLE, ZFS, NFS, ggatec - suspected memory leak

Rick Macklem rmacklem at uoguelph.ca
Fri Apr 27 12:08:47 UTC 2012


Daniel Braniss wrote:
> > ----Security_Multipart(Fri_Apr_27_13_35_56_2012_748)--
> > Content-Type: Text/Plain; charset=us-ascii
> > Content-Transfer-Encoding: 7bit
> >
> > Rick Macklem <rmacklem at uoguelph.ca> wrote
> >   in
> >   <1527622626.3418715.1335445225510.JavaMail.root at erie.cs.uoguelph.ca>:
> >
> > rm> Steven Hartland wrote:
> > rm> > ---- Original Message -----
> > rm> > From: "Rick Macklem" <rmacklem at uoguelph.ca>
> > rm> > > At a glance, it looks to me like 8.x is affected. Note that
> > the
> > rm> > > bug only affects the new NFS server (the experimental one
> > for 8.x)
> > rm> > > when exporting ZFS volumes. (UFS exported volumes don't
> > leak)
> > rm> > >
> > rm> > > If you are running a server that might be affected, just:
> > rm> > > # vmstat -z | fgrep -i namei
> > rm> > > on the server and see if the 3rd number shown is increasing.
> > rm> >
> > rm> > Many thanks Rick wasnt aware we had anything experimental
> > enabled
> > rm> > but I think that would be a yes looking at these number:-
> > rm> >
> > rm> > vmstat -z | fgrep -i namei
> > rm> > NAMEI: 1024, 0, 1, 1483, 25285086096, 0
> > rm> > vmstat -z | fgrep -i namei
> > rm> > NAMEI: 1024, 0, 0, 1484, 25285945725, 0
> > rm> >
> > rm> ^
> > rm> I don't think so, since the 3rd number (USED) is 0 here.
> > rm> If that # is increasing over time, you have the leak. You are
> > rm> probably running the old (default in 8.x) NFS server.
> >
> >  Just a report, I confirmed it affected 8.x servers running newnfs.
> >
> >  Actually I have been suffered from memory starvation symptom on
> >  that
> >  server (24GB RAM) for a long time and watching vmstat -z
> >  periodically. It stopped working once a week. I investigated the
> >  vmstat log again and found the amount of NAMEI leak was 11,543,956
> >  (about 11GB!) just before the locked-up. After applying the patch,
> >  the leak disappeared. Thank you for fixing it!
> >
> > -- Hiroki
And thanks Hiroki for testing it on 8.x.

> this is on 8.2-STABLE/amd64 from around August:
> same here, this zfs+newnfs has been hanging every few months, and I
> can see
> now the leak, it's slowly increasing:
> NAMEI: 1024, 0, 122975, 529, 15417248, 0
> NAMEI: 1024, 0, 122984, 520, 15421772, 0
> NAMEI: 1024, 0, 123002, 502, 15424743, 0
> NAMEI: 1024, 0, 123008, 496, 15425464, 0
> 
> cheers,
> danny
Maybe you could try the patch, too.

It's at:
   http://people.freebsd.org/~rmacklem/namei-leak.patch

I'll commit it to head soon with a 1 month MFC, so that hopefully
Oliver will have a chance to try it on his production server before
the MFC.

Thanks everyone, for your help with this, rick


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