>On Fri, Jun 29, 2012 at 02:29:37PM +0200, Hans Schillstrom wrote:
>> Hello,
>>
>> There is a "hard to find" problem in ctnetlink_conntrack_event() when calling
>> netlink_has_listeners() net->nfnl is NULL.
>>
>> The rcu stuff seems to be right at a first look but who knows...
>>
>> The line below fix the problem, but that is not the root cause.
>>
>> int nfnetlink_has_listeners(struct net *net, unsigned int group)
>> {
>> - return netlink_has_listeners(net->nfnl, group);
>> + return net->nfnl ? netlink_has_listeners(net->nfnl, group) : 0 ;
>> }
>>
>> Yes it is a 3.0.26 kernel but this patch is applied
>> netfilter: nf_conntrack: make event callback registration per-netns
>
>I think this patch above is missing some rcu_access_pointer usage.
>
>Please, see patch attached.
Thanks it looks like it's the missing patch.
/Hans
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