On Wednesday 2009-04-15 23:07, Eric Dumazet wrote:

Stephen Hemminger a écrit :

quoted

Looks like there is some recursive path into ip_tables that makes the
per-cpu spinlock break.  I get lockup's with KVM networking.

Suggestions?

Well, it seems original patch was not so bad after all

http://lists.netfilter.org/pipermail/netfilter-devel/2006-January/023175.html

So change per-cpu spinlocks to per-cpu rwlocks 

and use read_lock() in ipt_do_table() to allow recursion...

iptables cannot quite recurse into itself due to the comefrom stuff.