From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754859AbcBXBqz (ORCPT ); Tue, 23 Feb 2016 20:46:55 -0500 Received: from tn-76-7-162-101.sta.embarqhsd.net ([76.7.162.101]:39111 "EHLO animx.eu.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750897AbcBXBqy (ORCPT ); Tue, 23 Feb 2016 20:46:54 -0500 Date: Tue, 23 Feb 2016 20:46:52 -0500 From: Wakko Warner To: Hannes Frederic Sowa Cc: linux-kernel@vger.kernel.org, "netdev@vger.kernel.org" Subject: Re: 4.4.1 skb_warn_bad_offload+0xc5/0x110 Message-ID: <20160224014652.GA15207@animx.eu.org> Reply-To: Wakko Warner References: <20160216000838.GA12968@animx.eu.org> <56CB0CF5.1060906@stressinduktion.org> <20160224010137.GA27602@animx.eu.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160224010137.GA27602@animx.eu.org> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Please keep me in CC. Wakko Warner wrote: > > Hannes Frederic Sowa wrote: > > [full-quote for netdev] > > > > Hello, > > > > On 16.02.2016 01:08, Wakko Warner wrote: > > >I've been seeing the following on some of my VMs ran under qemu. The VMs do > > >not have internet connectivity. This happened when some files were accessed > > >via NFS to another VM (NOTE: Both VMs throw these warnings. Both VMs are > > >running the exact same kernel). The host is also throwing these warnings > > >and is also 4.4.1, but not the same kernel build. > > > > > >The issue appears to have gone away if I issue the following on the guests > > >and on the host (except br0 instead of eth0 on host) > > >ethtool -K eth0 gso off gro off ufo off tso off > > > > > >On the host, br0 does not have any interfaces enslaved except for the > > >interface for the VMs and also does not have an IPv4 address assigned. > > > > > > Can you try the following patch? > > > > --- a/net/ipv4/ip_output.c > > +++ b/net/ipv4/ip_output.c > > @@ -1233,6 +1233,9 @@ ssize_t ip_append_page(struct sock *sk, > > struct flowi4 *fl4, struct page *page, > > if (!skb) > > return -EINVAL; > > > > + if (skb->ip_summed != CHECKSUM_PARTIAL) > > + return -EINVAL; > > + > > cork->length += size; > > if ((size + skb->len > mtu) && > > (sk->sk_protocol == IPPROTO_UDP) && > > Still received the warning. I saw it on the host and on one of the VMs. > The VM in this case was an nfs server. The client did not receive the > warning. I should mention that I'm using v3 and udp on the client for the > mount options. > > I'm not sure if this change effected nfsd on one of the VMs, it isn't working > at all on it. I reverted back to the previous kernel for the VM only and the nfsd on the one VM started working. I should note that when I added this change, I only compiled the kernel and copied the bzImage file. I did not recompile any modules nor copy the system.map over. -- Microsoft has beaten Volkswagen's world record. Volkswagen only created 22 million bugs.