Re: [Testbed-admins] kernel memory leaks in FreeBSD NFS (patched)

[Mike Hibler <mike@flux.utah.edu>]

Yes, nice indeed!  I have been chasing that bug for a long time with no
luck!

On Thu, Dec 03, 2009 at 05:57:17PM -0700, Robert P Ricci wrote:
> Aha!
> 
> We do periodically run out of memory on our ops, and this certainly
> could be it.
> 
> Nice detective work!
> 
> Thus spake Mike Ryan on Thu, Dec 03, 2009 at 02:02:05PM -0800:
> > tb-admins:
> > 
> > The DETER team recently uncovered a bug in FreeBSD's NFS code that
> > causes the kernel to leak memory. If left untreated this bug can exhaust
> > kernel memory, causing a panic. As far as we can tell, this affects all
> > versions of FreeBSD currently in production.
> > 
> > We submitted a patch which has been pushed into FreeBSD CVS. The file
> > affected is src/sys/nfsserver/nfs_serv.c:
> > http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/nfsserver/nfs_serv.c?sortby=date 
> > 
> > 
> > An NFS client which tries to delete an inexistent file will trigger the
> > bug. This can result from rebooting the ops node while experiments are
> > running.
> > 
> > To test if you've been affected, on your ops node run:
> > 
> > $ nfsstat | grep -A1 faults
> > Server Faults
> >             0
> > 
> > If this number is greater than zero (or worse, climbing), then your NFS
> > server has been leaking memory. Regardless, we recommend patching your
> > systems.
> > 
> > 
> > For more details about the problem, see the original PR:
> > http://www.freebsd.org/cgi/query-pr.cgi?pr=140853
> > 
> > Mike Ryan
> > _______________________________________________
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> > Testbed-admins@flux.utah.edu
> > http://www.flux.utah.edu/mailman/listinfo/testbed-admins
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