From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cong Wang <xiyou.wangcong@gmail.com>
Subject: Re: Latest net-next kernel 4.19.0+
Date: Mon, 29 Oct 2018 19:27:39 -0700
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Cc: Linux Kernel Network Developers <netdev@vger.kernel.org>
To: =?UTF-8?Q?Pawe=C5=82_Staszewski?= <pstaszewski@itcare.pl>
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Hi,

On Mon, Oct 29, 2018 at 5:19 PM Pawe=C5=82 Staszewski <pstaszewski@itcare.p=
l> wrote:
>
> Sorry not complete - followed by hw csum:
>
> [  342.190831] vlan1490: hw csum failure
> [  342.190835] CPU: 52 PID: 0 Comm: swapper/52 Not tainted 4.19.0+ #1
> [  342.190836] Call Trace:
> [  342.190839]  <IRQ>
> [  342.190849]  dump_stack+0x46/0x5b
> [  342.190856]  __skb_checksum_complete+0x9a/0xa0
> [  342.190859]  tcp_v4_rcv+0xef/0x960
> [  342.190864]  ip_local_deliver_finish+0x49/0xd0
> [  342.190866]  ip_local_deliver+0x5e/0xe0
> [  342.190869]  ? ip_sublist_rcv_finish+0x50/0x50
> [  342.190870]  ip_rcv+0x41/0xc0
> [  342.190874]  __netif_receive_skb_one_core+0x4b/0x70
> [  342.190877]  netif_receive_skb_internal+0x2f/0xd0
> [  342.190879]  napi_gro_receive+0xb7/0xe0
> [  342.190884]  mlx5e_handle_rx_cqe+0x7a/0xd0
> [  342.190886]  mlx5e_poll_rx_cq+0xc6/0x930
> [  342.190888]  mlx5e_napi_poll+0xab/0xc90


We got exactly the same backtrace in our data center. However,
it is not easy for us to reproduce it, do you have any clue to reproduce it=
?

If you do, try to tcpdump the packets triggering this warning, it could
be useful for debugging.

Also, we tried to apply commit d55bef5059dd057bd, the warning _still_
occurs. We tried to revert the offending commit 88078d98d1bb, it
disappears. So it is likely that commit 88078d98d1bb introduces
more troubles than the one fixed by d55bef5059dd057bd.