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Date: Fri, 18 Nov 2011 20:35:28 +0800 From: Jinxin Zheng <jinxinzheng@...il.com> To: Hagen Paul Pfeifer <hagen@...u.net> Cc: gerrit@....abdn.ac.uk, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: ipv4 udplite broken in >=linux-3.0 ? On Fri, Nov 18, 2011 at 8:04 PM, Hagen Paul Pfeifer <hagen@...u.net> wrote: > * Jinxin Zheng | 2011-11-18 12:09:25 [+0800]: > >>I don't know how to debug udplite. Can any one of you give me a tip on >>how to get more debug info, then I can do further test and provide >>with it? > > net-next works for me: > > $ sudo aptitude install netsend > $ sudo tcpdump -n -ttt -vv -i lo > pcap.trace & > $ netsend udplite receive & > $ netsend udplite transmit /etc/fstab 127.0.0.1 > > $ cat pcap.trace > 00:00:00.000000 IP (tos 0x0, ttl 64, id 30602, offset 0, flags [DF], proto unknown (136), length 40) 127.0.0.1 > 127.0.0.1: udplite 20 > 00:00:00.000074 IP (tos 0x0, ttl 64, id 30603, offset 0, flags [DF], proto unknown (136), length 1125) 127.0.0.1 > 127.0.0.1: udplite 1105 > > > Kernel version? What is the output of strace? > The kernel version is 3.0. I compiled it myself on a Gentoo i386. I do not use Ubuntu or Debian. Cannot get netsend in Gentoo ... But I did the test using the hello_world application downloaded from Gerrit's wiki: http://www.erg.abdn.ac.uk/~gerrit/udp-lite/ It contains a simple 'server' and a 'client' program. The client sends a "Hello World" to the server, and when the server receives the message it exits. $ tcpdump -n -ttt -vv -i lo > pcap.trace & $ ./server & $ ./client $ cat pcap.trace 00:00:00.000000 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto unknown (136), length 41) 127.0.0.1 > 127.0.0.1: ip-proto-136 21 the pcap trace seems ok. The sendto() in the client returns ok. But the server just cannot return from recv() and echo the message... I can't see anything suspicious from strace for the server or client either... -- Zheng Jinxin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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