when vxlan is encapsulated with ipsec (libreswan) i see lots of messages with "hw csum failure".

my setup:

boxA [vxlan100] === ipsec/internet === [vxlan100]boxB 


Both box have the same setup running debian stretch:
kernel 4.9.82
libreswan 3.23
iproute 4.9.0


NOTE: not sure if it duplicates issues #111331 and #198025, they seam very similar... if so please forgive me.





Some errors in dmesg:

[76811.241149] vxlan100: hw csum failure
[76811.242677] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.0-6-amd64 #1 Debian 4.9.82-1+deb9u3
[76811.242685] Hardware name: AAEON UP-CHT01/UP-CHT01, BIOS UPC1BM0S 06/04/2016
[76811.242696]  0000000000000000 ffffffffa652e074 0000000000000000 ffff9b3b765b2500
[76811.242721]  ffffffffa6706c4a ffff9b3b765b2500 ffffc8437fc10a08 0000000000000000
[76811.242738]  0000000000000074 ffffffffa677df2f ffff9b3b76860488 ffff9b3b765b2500
[76811.242756] Call Trace:
[76811.242766]  <IRQ> 
[76811.242792]  [<ffffffffa652e074>] ? dump_stack+0x5c/0x78
[76811.242809]  [<ffffffffa6706c4a>] ? __skb_gro_checksum_complete+0x9a/0xa0
[76811.242826]  [<ffffffffa677df2f>] ? udp4_gro_receive+0xef/0x2d0
[76811.242839]  [<ffffffffa6786418>] ? inet_gro_receive+0x1f8/0x2a0
[76811.242851]  [<ffffffffa670a353>] ? dev_gro_receive+0x233/0x3c0
[76811.242864]  [<ffffffffa670a513>] ? napi_gro_receive+0x33/0xe0
[76811.242889]  [<ffffffffc0a18390>] ? gro_cell_poll+0x50/0x90 [vxlan]
[76811.242900]  [<ffffffffa6709fe6>] ? net_rx_action+0x246/0x380
[76811.242915]  [<ffffffffa6814dda>] ? __do_softirq+0x10a/0x29e
[76811.242930]  [<ffffffffa627d7fe>] ? irq_exit+0xae/0xb0
[76811.242940]  [<ffffffffa6813f0f>] ? do_IRQ+0x4f/0xd0
[76811.242952]  [<ffffffffa6811c96>] ? common_interrupt+0x96/0x96
[76811.242956]  <EOI> 
[76811.242975]  [<ffffffffa66d44a2>] ? cpuidle_enter_state+0xa2/0x2d0
[76811.242990]  [<ffffffffa62ba404>] ? cpu_startup_entry+0x154/0x240
[76811.243006]  [<ffffffffa6f3df62>] ? start_kernel+0x44b/0x46b
[76811.243017]  [<ffffffffa6f3d120>] ? early_idt_handler_array+0x120/0x120
[76811.243027]  [<ffffffffa6f3d408>] ? x86_64_start_kernel+0x14c/0x170
[76812.329058] br2: hw csum failure
[76812.330679] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.9.0-6-amd64 #1 Debian 4.9.82-1+deb9u3
[76812.330701] Hardware name: AAEON UP-CHT01/UP-CHT01, BIOS UPC1BM0S 06/04/2016
[76812.330729]  0000000000000000 ffffffffa652e074 ffff9b3b778c2400 ffff9b3b76561000
[76812.330751]  ffffffffa66fb712 000000003ca7c358 ffff9b3b778c2400 ffffffffa6781805
[76812.330769]  ffffffffa6a99c60 ffff9b3b778c2400 ffffffffa6edbb00 ffff9b3b78f44000
[76812.330787] Call Trace:
[76812.330796]  <IRQ> 
[76812.330819]  [<ffffffffa652e074>] ? dump_stack+0x5c/0x78
[76812.330836]  [<ffffffffa66fb712>] ? __skb_checksum_complete+0xb2/0xc0
[76812.330848]  [<ffffffffa6781805>] ? icmp_rcv+0xa5/0x3a0
[76812.330879]  [<ffffffffa674a853>] ? ip_local_deliver_finish+0x93/0x1c0
[76812.330913]  [<ffffffffa674ab1b>] ? ip_local_deliver+0x6b/0xf0
[76812.330952]  [<ffffffffa674a7c0>] ? ip_rcv_finish+0x400/0x400
[76812.330984]  [<ffffffffa674ae20>] ? ip_rcv+0x280/0x3a0
[76812.330997]  [<ffffffffa67fbbd1>] ? packet_rcv+0x41/0x430
[76812.331010]  [<ffffffffa67091fd>] ? __netif_receive_skb_core+0x51d/0xa40
[76812.331024]  [<ffffffffa62a2064>] ? try_to_wake_up+0x54/0x3c0
[76812.331037]  [<ffffffffa670979f>] ? netif_receive_skb_internal+0x2f/0xa0
[76812.331091]  [<ffffffffc03a5e9a>] ? xhci_queue_bulk_tx+0x26a/0x940 [xhci_hcd]
[76812.331148]  [<ffffffffc0a3b6c2>] ? br_pass_frame_up+0xc2/0x160 [bridge]
[76812.331206]  [<ffffffffc0a3b980>] ? br_handle_frame_finish+0x220/0x510 [bridge]
[76812.331235]  [<ffffffffa62afa82>] ? enqueue_task_fair+0x82/0x940
[76812.331270]  [<ffffffffc0a3bcb0>] ? br_handle_local_finish+0x40/0x40 [bridge]
[76812.331303]  [<ffffffffc0a3be1b>] ? br_handle_frame+0x16b/0x2f0 [bridge]
[76812.331390]  [<ffffffffc03325ad>] ? usb_hcd_submit_urb+0xad/0xaf0 [usbcore]
[76812.331420]  [<ffffffffa66f2d3e>] ? __kmalloc_reserve.isra.35+0x2e/0x80
[76812.331433]  [<ffffffffa6708fe8>] ? __netif_receive_skb_core+0x308/0xa40
[76812.331562]  [<ffffffffc056ca22>] ? ieee80211_rx_napi+0x2f2/0x9c0 [mac80211]
[76812.331599]  [<ffffffffa622e210>] ? recalibrate_cpu_khz+0x10/0x10
[76812.331620]  [<ffffffffa670979f>] ? netif_receive_skb_internal+0x2f/0xa0
[76812.331631]  [<ffffffffa670a598>] ? napi_gro_receive+0xb8/0xe0
[76812.331652]  [<ffffffffc0a18390>] ? gro_cell_poll+0x50/0x90 [vxlan]
[76812.331663]  [<ffffffffa6709fe6>] ? net_rx_action+0x246/0x380
[76812.331701]  [<ffffffffa6814dda>] ? __do_softirq+0x10a/0x29e
[76812.331726]  [<ffffffffa627d7fe>] ? irq_exit+0xae/0xb0
[76812.331736]  [<ffffffffa6813f0f>] ? do_IRQ+0x4f/0xd0
[76812.331746]  [<ffffffffa6811c96>] ? common_interrupt+0x96/0x96
[76812.331751]  <EOI> 
[76812.331770]  [<ffffffffa66d44a2>] ? cpuidle_enter_state+0xa2/0x2d0
[76812.331812]  [<ffffffffa62ba404>] ? cpu_startup_entry+0x154/0x240
[76812.331842]  [<ffffffffa6f3df62>] ? start_kernel+0x44b/0x46b
[76812.331854]  [<ffffffffa6f3d120>] ? early_idt_handler_array+0x120/0x120
[76812.331864]  [<ffffffffa6f3d408>] ? x86_64_start_kernel+0x14c/0x170