From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arthur Helfstein Fragoso Subject: PROBLEM: Regression - Can't upload some data in my network - Destination unreachable (Fragmentation needed) Date: Mon, 24 Nov 2014 02:51:20 -0200 Message-ID: <5472B948.1040802@life.net.br> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Cc: davem@davemloft.net To: netdev@vger.kernel.org Return-path: Received: from smtp-03c.idc2.mandic.com.br ([177.70.124.30]:43254 "EHLO smtp-03.idc2.mandic.com.br" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750828AbaKXFBx (ORCPT ); Mon, 24 Nov 2014 00:01:53 -0500 Sender: netdev-owner@vger.kernel.org List-ID: Hi all, A few years ago, I was using Fedora 16 and I was unable to do any HTTP POST at the place where I work. I also could not upload files via FTP, send emails or do a 'git push'. So I tried Ubuntu 12.04 (or 12.10, I'm not quite sure) and it worked perfectly. Recently I updated it to 14.04 and the same problem I had in Fedora came back. I'm not an expert in understanding network packages, but by googling I read that it could be that the network manager could have blocked the ICMP MTU dicovery package. I could try to ask the network manager to find a way to fix it, but I think more people could also have this problem somewhere in the world. I asked in Ubuntu's lauchpad, and Christopher M. Penalver guided me to do a bisection. I only have this problem at the place where I work and it happens with any machine with a kernel older than 3.5. most use windows there and they don't have this problem. I did a bisection and I also have a wireshark output. Those attachments are all in lauchpad. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1349000 Recently there were some changes in the network, the bug stills affects some upload services, like: git push, and sending messages in pidgin... Let me know what I could do or provide to help to fix this problem. Bisection results: 3.5.0 is good c0efc887dcadbdbfe171f028acfab9c7c00e9dde is good. 97bab73f987e2781129cd6f4b6379bf44d808cc6 - gives me a kernel panic when trying to do an upload of data. 7b34ca2ac7063f4ebf07f85fd75253ed84d5c648 - same problem, kernel panic when trying to do an upload of data. The kernel panic goes up to 352e04b9111d608bd89ba7bd8070846d4f97d104 352e04b9111d608bd89ba7bd8070846d4f97d104 - doesn't give me a kernel panic, but it just hangs when trying to upload data, and this is the problem that I currently face in the upstream kernel. to test what versions were good or bad, I tried to do an upload by doing a 'git push' in a test repository. the bad versions just hanged when I did 'git push'. Thank you, Arthur Helfstein Fragoso