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

Trond Myklebust
2009-03-03T14:16:29Z

On Tue, 2009-03-03 at 13:08 +0100, Kasparek Tomas wrote:
> On Tue, Jan 20, 2009 at 10:32:27AM -0500, Trond Myklebust wrote:
> > A binary wireshark dump of the traffic between one such client and the
> > server would help.
>
> I was able to finally got the tcpdump. I got it from 2.6.27.19 client but
> after several weeks without problems. I include the file and place it on
> http://merlin.fit.vutbr.cz/tmp/nfs/dump_kas2_mat.dump_small (have over 1GB
> of dump, but it's all the time the same SYN+RST packets). The packet rate
> maxed at 260000pps from two clients.
>
> This dump is taken from server after reset (the server does not respond
> even to keybord) before clients are disconnected/rebooted. To remind it - all
> clients seems to work well with reversed
> e06799f958bf7f9f8fae15f0c6f519953fb0257c

Yes. I saw that behaviour when testing at Connectathon last week. When
one of the servers I was testing against crashed and later came up
again, the patched client went into that same SYN+RST frenzy. I'm
planning to look at this now that I'm back at home.

Cheers
Trond

--
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@netapp.com