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Re: rwlock recursion on CPU#0, netfilter related?

To: Pekka Pietikainen <pp@xxxxxxxxxx>
Subject: Re: rwlock recursion on CPU#0, netfilter related?
From: Harald Welte <laforge@xxxxxxxxxxxx>
Date: Sun, 25 Sep 2005 15:43:44 +0200
Cc: netdev@xxxxxxxxxxx
In-reply-to: <20050925105834.GA15243@ee.oulu.fi>
References: <20050925105834.GA15243@ee.oulu.fi>
Sender: netdev-bounce@xxxxxxxxxxx
User-agent: mutt-ng devel-20050619 (Debian)
On Sun, Sep 25, 2005 at 01:58:34PM +0300, Pekka Pietikainen wrote:
> Just to get a wider audience, somewhere between 2.6.13-git4 and current 
> (2.6.14-rc2-git4 is the last one I tested, which seems to have some
> fixes in this are wrt. git3, but problem remains) my x86_64
> crashes quite quickly after boot. Using Fedora devel kernels, I can
> probably whip up a vanilla kernel if the maintainers in this area
> prefer that.
> 
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=167835

Can you please give some more feedback like 

1) how does your kernel .config look like?
2) which modules are loaded
3) how does your ruleset look like?
4) most importantly, have you enabled CONFIG_IP_NF_CONNTRACK_EVENTS ?
   if yes, please disable, it's broken, a fix has been submitted, but I
   don't know if it has propagated to Linus yet (netdev Message-ID:
   <20050922143515.GD8917@xxxxxxxxxxxxxxxxxxxx>)


please also try 

a) only loading iptable_filter (and ip_tables), but no other modules
a) only loading ip_conntrack but no other netfilter modules (no nat, no 
iptables)
b) only loading ip_conntrack and iptable_nat (but no rules)

this kind of debugging helps to locate where it is.  netfilter has grown
big ;)

Also, I have that Ping time problem on my x86_64 debian unstable (smp).
But only in 1 out of ten cases on average (when starting ping, ctrl+c,
pin, ctrl+c, ...).  I've always assumed it's some 64bit problem in
"ping" itself.

-- 
- Harald Welte <laforge@xxxxxxxxxxxx>                   http://gnumonks.org/
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