netdev - Re: BUG: 4.14.11 unable to handle kernel NULL pointer dereference in xfrm

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Date:   Tue, 9 Jan 2018 10:26:24 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Tobias Hommel <netdev-list@...oetigt.de>
CC:     <netdev@...r.kernel.org>
Subject: Re: BUG: 4.14.11 unable to handle kernel NULL pointer dereference in
 xfrm_lookup

On Tue, Jan 09, 2018 at 10:06:51AM +0100, Tobias Hommel wrote:
> > 
> > You have CONFIG_INET_ESP_OFFLOAD enabled, this is new maybe it
> > still has some problems. You should not hit an offload codepath
> > because all your SAs are configured with UDP encapsulation which
> > is still not supported with offload.
> > 
> > Please try to disable GRO on both interfaces and see what happens:
> > 
> > ethtool -K eth0 gro off
> > ethtool -K eth1 gro off
> I actually already tried that with only eth1 off, to verify I turned offloading
> off for both interfaces. The same problem: see attached panic.gro_off.log
> 
> > 
> > Then disable CONFIG_INET_ESP_OFFLOAD and try again.
> Rebuild with CONFIG_INET_ESP_OFFLOAD disabled, same problem: see attached
> panic.esp_offload_disabled.log

So ESP offload is not the problem. Next thing that comes to my mind
is the flowcache removal, this was introduced with v4.14.

> 
> > 
> > This should show us if this feature is responsible for the bug.
> > 
> 
> I will try narrowing down the problem by trying out some older kernels for now.

Thanks!

Let me know about the results.