From mboxrd@z Thu Jan 1 00:00:00 1970 From: Patrick McHardy Subject: Re: CLUSTERIP and UML crash, was [Re: --dport in uml crash] Date: Tue, 24 Oct 2006 17:48:05 +0200 Message-ID: <453E35B5.5010600@trash.net> References: <1161644625.8705.16.camel@LAPTOP4.MSHOME> <453D4D6C.5050508@trash.net> <1161680257.8705.31.camel@LAPTOP4.MSHOME> <453E2220.3090506@trash.net> <1161704038.8705.51.camel@LAPTOP4.MSHOME> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Cc: netfilter-devel@lists.netfilter.org Return-path: To: oan@frozentux.net In-Reply-To: <1161704038.8705.51.camel@LAPTOP4.MSHOME> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: netfilter-devel-bounces@lists.netfilter.org Errors-To: netfilter-devel-bounces@lists.netfilter.org List-Id: netfilter-devel.vger.kernel.org Oskar Andreasson wrote: > Hi Patrick, > > You seem to be right yes, regarding module loading/handling. I don't > dare say anything more, but a non-qualified guess is that it feels like > some kind of bug between how the UML kernel handles modules and how > iptables interact? Mhh I guess thats rather unlikely, iptables modules do nothing special. Any change your /sbin/modprobe is also linked against the wrong libc or something like that (and command-line uses /usr/local/sbin/modprobe)? > I've attached 3 more scenarios. > > 1. just restarted, issuing > iptables -t nat -A PREROUTING -j DNAT --to 192.168.10.2 > lsmod > result: kernel panic from lsmod > > 2. just restarted, issuing > iptables -t nat -A POSTROUTING -j MASQUERADE > lsmod > result: kernel panic, exactly the same as first scenario (except for a > couple of addresses). > > 3. just restarted, issuing > modprobe ipt_MASQUERADE > modprobe ip_tables > lsmod > iptables -t nat -A POSTROUTING -j MASQUERADE > lsmod > result: the last lsmod results in a kernel panic. > > All modules loaded with modprobe seems to work just fine, until iptables > touches them. > > I just tried starting an nfs kernel server also, which didn't seem to > work either, so it seems mostly like an UML bug. It crashed at lsmod as > well. > > Would you know which way is the best to get in touch with the > uml-people, and how to debug this? My experience with gdb is ... > somewhat limited. I guess now is as bad a time as any to finally sit > down with it :(. Suggestions on what to read are welcome. There's a mailing list at M: jdike@karaya.com L: user-mode-linux-devel@lists.sourceforge.net L: user-mode-linux-user@lists.sourceforge.net