Re: [PATCH 0/3] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"

Kasparek Tomas
2009-01-28T08:18:57Z

On Tue, Jan 20, 2009 at 10:32:27AM -0500, Trond Myklebust wrote:
> On Tue, 2009-01-20 at 16:03 +0100, Kasparek Tomas wrote:
> > On Sun, Jan 18, 2009 at 02:08:35PM +0100, Kasparek Tomas wrote:
> > > > > > The attached 2 patches have been tested using a server that was rigged
> > > > > > not to ever close the socket. They appear to work fine on my setup,
> > > > > > without the hang that you reported earlier.
> > > ...
> > > It seems that machines with this new kernel (tried on 10 other machines
> > > and the original client) may after few days get into state where they
> > > generate huge amounts (10000-100000pkt/s) of packets on another server they
> > > use (Linux 2.6.26.62, but the same behaviour with other kernels I tried -
> > > 2.6.24.7, 2.6.22.19, 2.6.27.10). It seems packets are quiet small as the
> > > flow on server is about 5-10MB/s. (probably) Each packet generates an answer.
> > > With this flow it is hard to get more info and the server is production
> > > one, so for now I only know it goes from these clients and end on tcp port
> > > 2049 on that server. It kills just this server, communication with the
> > > previously problematic (FreeBSD machines) is fine now.
> >
> > patches. Do not have more info about what's there on network, the only new
> > thing I can add is that the client is dead not reacting even on keyborad or
> > anything else. Trond, would you have and idea what to try now or what other
>
> A binary wireshark dump of the traffic between one such client and the
> server would help.

I tried to get some data several times, but the client is dead and the
server is overloaded so much, that I'm unable to get anything reasonable. I
did tried to insert another mechine in front of the client as a bridge, but
the traffic overloaded it the same way as the server. I will try to figure
out how to get some traffic dump, but have no other idea for now.

Bye

--

Tomas Kasparek, PhD student E-mail: kasparek@fit.vutbr.cz
CVT FIT VUT Brno, L127 Web: http://www.fit.vutbr.cz/~kasparek
Bozetechova 1, 612 66 Fax: +420 54114-1270
Brno, Czech Republic Phone: +420 54114-1220

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