tun: unexpected GSO type

[lejeczek]

Hi everybody.

I wonder if somebody would know bit more what to do or think
about this:
...
[Fri May 29 08:00:02 2020] tun: unexpected GSO type: 0x0,
gso_size 1368, hdr_len 66
[Fri May 29 08:00:02 2020] tun: 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00  ................
[Fri May 29 08:00:02 2020] tun: 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00  ................
[Fri May 29 08:00:02 2020] tun: 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00  ................
[Fri May 29 08:00:02 2020] tun: 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00  ................
[Fri May 29 08:00:02 2020] ------------[ cut here ]------------
[Fri May 29 08:00:02 2020] WARNING: CPU: 2 PID: 3605 at
drivers/net/tun.c:2123 tun_do_read+0x524/0x6c0 [tun]
[Fri May 29 08:00:02 2020] Modules linked in: sd_mod sg
vhost_net vhost tap xt_CHECKSUM xt_MASQUERADE xt_conntrack
nf_nat_tftp nf_conntrack_tftp tun nft_nat ipt_REJECT bridge
nft_counter nft_objref nf_conntrack_netbios_ns
nf_conntrack_broadcast nft_masq nft_fib_inet nft_fib_ipv4
nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4
nf_reject_ipv6 nft_reject nft_ct nf_tables_set nft_chain_nat
nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 qedf qed
ip6_tables crc8 nft_compat bnx2fc ip_set cnic uio libfcoe
8021q garp mrp stp llc libfc scsi_transport_fc nf_tables
nfnetlink sunrpc vfat fat ext4 mbcache jbd2
snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg
snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device
edac_mce_amd snd_pcm kvm_amd kvm eeepc_wmi asus_wmi
sp5100_tco sparse_keymap irqbypass rfkill wmi_bmof pcspkr
joydev i2c_piix4 k10temp snd_timer snd soundcore gpio_amdpt
gpio_generic acpi_cpufreq ip_tables xfs libcrc32c dm_crypt
ax88179_178a usbnet mii hid_lenovo nouveau video mxm_wmi
i2c_algo_bit
[Fri May 29 08:00:02 2020]  drm_kms_helper syscopyarea
sysfillrect sysimgblt fb_sys_fops crct10dif_pclmul ttm
crc32_pclmul crc32c_intel ahci libahci drm
ghash_clmulni_intel libata nvme ccp r8169 nvme_core realtek
wmi t10_pi pinctrl_amd dm_mirror dm_region_hash dm_log dm_mod
...

I am using:
qemu-img version 4.2.0 (qemu-kvm-4.2.0-19.el8)
on Centos 8 with kernel 5.6.15-1.el8.elrepo.x86_64

many thanks, L.