netdev - Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+

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Message-ID: <20080526142904.GA11829@elte.hu>
Date:	Mon, 26 May 2008 16:29:04 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ilpo J?rvinen <ilpo.jarvinen@...sinki.fi>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+


there's TCP ACK activity every 120 seconds:

 16:19:05.260000 IP europe.37198 > europe.distcc: . ack 2022529163 win 257
  <nop,nop,timestamp 233526 221526>
 16:19:05.260000 IP europe.distcc > europe.37198: . ack 1          win 0 
  <nop,nop,timestamp 233526 7020>
 16:21:05.260000 IP europe.37198 > europe.distcc: . ack 1          win 257
  <nop,nop,timestamp 245526 233526>
 16:21:05.260000 IP europe.distcc > europe.37198: . ack 1          win 0
  <nop,nop,timestamp 245526 7020>
 16:23:05.260000 IP europe.37198 > europe.distcc: . ack 1          win 257
  <nop,nop,timestamp 257526 245526>
 16:23:05.260000 IP europe.distcc > europe.37198: . ack 1          win 0
  <nop,nop,timestamp 257526 7020>
 16:25:05.260000 IP europe.37198 > europe.distcc: . ack 1          win 257 
  <nop,nop,timestamp 269526 257526>
 16:25:05.260000 IP europe.distcc > europe.37198: . ack 1          win 0 
  <nop,nop,timestamp 269526 7020>
 16:27:05.260000 IP europe.37198 > europe.distcc: . ack 1          win 257 
  <nop,nop,timestamp 281526 269526>
 16:27:05.260000 IP europe.distcc > europe.37198: . ack 1          win 0 
  <nop,nop,timestamp 281526 7020>

The socket on the other side of the localhost connection, 
10.0.1.15:3632, produces no packets.

a detail i forgot to mention: i reproduced the same TCP hang on a 32-bit 
system and on a 64-bit system as well.

	Ingo
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