Xen users - Oct 2010 - Fwd: Re: [Openswan Users] klips_error:ipsec_xmit_encap_once: tried to skb_put 20, 16 available. This should never happen, please report.

I''m having some weird networking issue which seem to happen only on a
Xen VM.  Initially I suspected OpenSwan but one of the developers
suggested it might be a Xen (networking) issue.

Bellow is the email of Mr. Paul Wouters:


===========
-------- Original Message --------
Subject: 	Re: [Openswan Users] klips_error:ipsec_xmit_encap_once: tried
to skb_put 20, 16 available. This should never happen, please report.
Date: 	Sat, 2 Oct 2010 12:24:54 -0400 (EDT)
From: 	Paul Wouters <paul@xelerance.com>
To: 	Danilo Godec <danilo.godec@agenda.si>
CC: 	users@lists.openswan.org



On Sat, 2 Oct 2010, Danilo Godec wrote:
> I have a server running OpenSwan 2.6.29, using MAST stack. The server
> has three Xen VM''s and currently 4 active LAN''s behind.
There is not a
> lot of traffic yet, as the building is not quite finished...
>
> If I connect to a VM and run a simple ''ls -lR /'' it will
sometimes get
> ''stuck''. At that moment, a lot of these messages appear
on the IPSEC server:
>
>> Oct  2 14:04:34 lmqxen1 kernel: [59061.763064]
>> klips_error:ipsec_xmit_encap_once: tried to skb_put 21, 17 available.
>> This should never happen, please report.
Are you running tight on memory?
> I also see these messages when ''cfagent'' (a part of
''cfengine'') on a VM
> copies files from the server and gets stuck...
Yeah, this does not seem to be an openswan bug. The code in question is:
(one instance of it):

        /* Set the data pointer */
        skb_reserve(n,skb->data-skb->head+headroom);
        /* Set the tail pointer and length */
        if(skb_tailroom(n) < skb->len) {
                printk(KERN_WARNING "klips_error:skb_copy_expand: "
                       "tried to skb_put %ld, %d available.  This should
never happen, please report.\n",
                       (unsigned long int)skb->len,
                       skb_tailroom(n));
                ipsec_kfree_skb(n);
                return NULL;
        }

I would check with the xen people to see what might be going on.

Paul


===========
The server runs OpenSuSE 11.2 (x86_64), has 4GB of RAM, each of three
VM''s allocates 512MB. Xen version is 3.4.1, I''m using bridged
networking. Each VM has it''s own bridge and it servers as a router for
the subnet.

I couldn''t see any error messages in Xen logs...

Any ideas?

   Regards, Danilo




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