From mboxrd@z Thu Jan 1 00:00:00 1970 From: "=?UTF-8?Q?H=C3=A5kon_L=C3=B8vdal?=" Subject: Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+ Date: Sat, 31 May 2008 22:25:22 +0200 Message-ID: References: <20080526115628.GA31316@elte.hu> <1211966834.12349.62.camel@twins> <484191BD.8000904@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Cc: LKML , Netdev , "Ingo Molnar" , "David S. Miller" , "Rafael J. Wysocki" , "Andrew Morton" To: "=?UTF-8?Q?Ilpo_J=C3=A4rvinen?=" Return-path: Received: from rv-out-0506.google.com ([209.85.198.234]:42518 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752811AbYEaUZX (ORCPT ); Sat, 31 May 2008 16:25:23 -0400 Received: by rv-out-0506.google.com with SMTP id l9so396208rvb.1 for ; Sat, 31 May 2008 13:25:22 -0700 (PDT) In-Reply-To: Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-ID: MjAwOC81LzMxIElscG8gSsOkcnZpbmVuIDxpbHBvLmphcnZpbmVuQGhlbHNpbmtpLmZpPjoKPiBP aywgbGlrZSB5b3Ugc2FpZCwgdGhpcyBpcyBub3QgZXhhY3RseSB0aGUgc2FtZSwgdGhvdWdoIGl0 IG1pZ2h0IGJlIGR1ZSB0bwo+IHRoZSBzYW1lIGJ1Zy4gSW4gSW5nbydzIGNhc2UgYm90aCBlbmRw b2ludHMgd2VyZSBkb2luZyBwcmV0dHkgaGVhbHRpbHksCj4gd2l0aCBwZXJpb2RpYyB3aW5kb3cg cHJvYmVzIGFzIGV4cGVjdGVkLiBJbiB5b3VyIGNhc2UgVENQIGlzIG5vdCBkb2luZwo+IHdpbmRv dyBwcm9iZXMgYnV0IGdvdCB0aGF0IGludGVyZXN0aW5nIFJUTyB2YWx1ZS4KPgo+IFNvIHlvdSBo YWQgdGhhdCAnLScgZWFybGllciBhbmQgeW91IGNoZWNrZWQgYXQgdGhhdCB0aW1lIGJ1dCB0aGUK PiBjb25uZWN0aW9uIGlzIG5vdyBhbHJlYWR5IGRlYWQ/CgpUaGlzIGlzIG9ubHkgZnJvbSBjaGVj a2luZyBhZnRlciB0aGUgY29ubmVjdGlvbiB3YXMgZGVhZC4gQnkgdGhlIHdheSwKSSBqdXN0IGhh ZCB0byByZW1vdGVseSByZWJvb3QgdGhlIG5ldyBtYWNoaW5lIGJlY2F1c2UgdGhlIHdpbmRvdwpt YW5hZ2VyIGxvY2tlZCB1cCwgaG93ZXZlciB0aGUgb2xkIFBDIGFyZSBzdGlsbCBsaXN0aW5nIHRo ZSBkZWZ1bmN0CmNvbm5lY3Rpb25zIGFmdGVyIHRoaXMuCgoKPiA6LSgsIEkgd291bGQgc29tZSBt dWNoIGxpa2VkIHRvIHNlZSB3aGF0IHRoZXkgd2VyZSBkb2luZy4KCkkgY2FuIG9mIGNvdXJzZSBr ZWVwIG9uIGNvcHlpbmcgZm9yIHRlc3RpbmcgcHVycG9zZXMsIGJ1dCB0aGVuIEkgd291bGQgbGlr ZSB0bwpiZSBhYmxlIHRvIGR1bXAgb25seSB0aGF0IHNpbmdsZSB0Y3AgY29ubmVjdGlvbiwgYW55 IHRpcHMgb2YgaG93IHRvIGRvIHRoYXQ/CkkgZm91bmQgbm90aGluZyBzcGVjaWZpYyBpbiB0aGUg bWFudWFscyBvZiB3aXJlc2hhcmsgYW5kIHRjcGR1bXAuIE9mIGNvdXJzZQppdCBpcyBwb3NzaWJs ZSB0byBjYXB0dXJlIGV2ZXJ5dGhpbmcgYW5kIGZpbHRlciBhZnRlcndhcmRzLCBidXQgc2luY2Ug SSB3aWxsIGJlCnRyYW5zZmVycmluZyBsb3RzIG9mIGRhdGEgdGhlIGxvZ3Mgd2lsbCBnZXQgaHVn ZSBhbmQgSSB3b3VsZCBub3QgbGlrZSB0byBoYXZlCmV2ZW4gYWRkaXRpb25hbCB0cmFmZmljIGlu c2lkZS4uLgoKCj4gVGhlc2UgN0MvRC4uLiBjZXJ0YWlubHkgc2VlbSBzdHJhbmdlIHZhbHVlcy4g V2hpY2ggVENQIHZhcmlhbnQgeW91IGhhdmUgaW4KPiB1c2UgKGNhdCAvcHJvYy9zeXMvbmV0L2lw djQvdGNwX2Nvbmdlc3Rpb25fY29udHJvbCk/IEl0IHNlZW1zIHRoYXQgdmVnYXMsCj4gdmVubyBh bmQgeWVhaCBhdCBsZWFzdCBjb250YWluIDB4N2ZmZmZmZmYgdGhlcmUgZm9yIHNvbWUgcnR0LCB3 aGljaCBjb3VsZAo+IHBlcmhhcHMgc29tZWhvdyBsZWFrLgoKSSBoYXZlIG5vdCBkb25lIGFueSBz cGVjaWZpYyBzZWxlY3Rpb24gbXlzZWxmLiBPbiBvbGRfcGM6IGJpYywgbmV3X3BjOiBjdWJpYy4K CkJSIEjDpWtvbiBMw7h2ZGFsCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755578AbYEaUZe (ORCPT ); Sat, 31 May 2008 16:25:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753434AbYEaUZY (ORCPT ); Sat, 31 May 2008 16:25:24 -0400 Received: from rv-out-0506.google.com ([209.85.198.235]:41783 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752324AbYEaUZW (ORCPT ); Sat, 31 May 2008 16:25:22 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=RPmNDXpi9PQI6iq5MhiFuWBQasJCEX7QQOzb5DkjfRJzTms/j7hDtE9AaNMolbDR0qIux5Jz1jk9aotpYYery3xLU9jy7US8UIgTcLWJd1o2fJ3UeDlAOBIu0rFzvCBVhperr0r3WTD3FJeXQP7LVNE2E4H8qzW0YsNGBqj65/k= Message-ID: Date: Sat, 31 May 2008 22:25:22 +0200 From: "=?UTF-8?Q?H=C3=A5kon_L=C3=B8vdal?=" To: "=?UTF-8?Q?Ilpo_J=C3=A4rvinen?=" Subject: Re: [bug] stuck localhost TCP connections, v2.6.26-rc3+ Cc: LKML , Netdev , "Ingo Molnar" , "David S. Miller" , "Rafael J. Wysocki" , "Andrew Morton" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline References: <20080526115628.GA31316@elte.hu> <1211966834.12349.62.camel@twins> <484191BD.8000904@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by alpha.home.local id m4VKPoHl032423 2008/5/31 Ilpo Järvinen :> Ok, like you said, this is not exactly the same, though it might be due to> the same bug. In Ingo's case both endpoints were doing pretty healtily,> with periodic window probes as expected. In your case TCP is not doing> window probes but got that interesting RTO value.>> So you had that '-' earlier and you checked at that time but the> connection is now already dead? This is only from checking after the connection was dead. By the way,I just had to remotely reboot the new machine because the windowmanager locked up, however the old PC are still listing the defunctconnections after this. > :-(, I would some much liked to see what they were doing. I can of course keep on copying for testing purposes, but then I would like tobe able to dump only that single tcp connection, any tips of how to do that?I found nothing specific in the manuals of wireshark and tcpdump. Of courseit is possible to capture everything and filter afterwards, but since I will betransferring lots of data the logs will get huge and I would not like to haveeven additional traffic inside... > These 7C/D... certainly seem strange values. Which TCP variant you have in> use (cat /proc/sys/net/ipv4/tcp_congestion_control)? It seems that vegas,> veno and yeah at least contain 0x7fffffff there for some rtt, which could> perhaps somehow leak. I have not done any specific selection myself. On old_pc: bic, new_pc: cubic. 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