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Date: Mon, 10 Jan 2005 03:11:09 +0100
From: Marc Lehmann <linux-kernel@plan9.de>
To: linux-kernel@vger.kernel.org
Subject: sockets stuck in FIN_WAIT2 and CLOSE_WAIT state in 2.6.10
Message-ID: <20050110021108.GA9758@schmorp.de>
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X-PGP: "1024D/DA743396 1999-01-26 Marc Alexander Lehmann <schmorp@schmorp.de>
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After upgrading to linux-2.6.10 (on 2004-12-26), my rsh processes start to
hang despite the server side having closed the connection.

Inspection showed that one of the two rsh processes exited:

   16011 ?        SN     0:00      0     6  1717   600  0.0 rsh ruth cd xmltv && ./upd
   16012 ?        ZN     0:00      0     0     0     0  0.0 [rsh] <defunct>

lsof shows both sockets:

   rsh     16011 root    3u  IPv4 6454542          TCP doom:1014->ruth:shell (FIN_WAIT2)
   rsh     16011 root    5u  IPv4 6454545          TCP doom:1013->ruth:1023 (CLOSE_WAIT)

and the remaining rsh process hangs in select on the FIN_WAIT2 socket:

   select(6, [3], NULL, NULL, NULL

Some of the hung processes are stuck for 14 days now.

I did not have the same problem with 2.6.10-rc1, or 2.6.8.1, which I used
before.

This is on a x86 SMP kernel using Debian GNU/Linux. If this problem is
already known, my apologies, I couldn't access a kernel list archive. If
you want more info, feel free to contact me.

-- 
                The choice of a
      -----==-     _GNU_
      ----==-- _       generation     Marc Lehmann
      ---==---(_)__  __ ____  __      pcg@goof.com
      --==---/ / _ \/ // /\ \/ /      http://schmorp.de/
      -=====/_/_//_/\_,_/ /_/\_\      XX11-RIPE