hi everyone,

With 4.4 I get:

...
tun: unexpected GSO type
...

It happens to a "third-party" kernel, namely:
5.6.15-1.el8.elrepo.x86_64 on Centos 8.

I wonder if anybody sees the same or similar and I also
wonder if I should report it somewhere in Bugzilla as
"heads-up" towards new kernels?


[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
[Fri May 29 08:00:02 2020] CPU: 2 PID: 3605 Comm: vhost-3578
Not tainted 5.6.15-1.el8.elrepo.x86_64 #1
[Fri May 29 08:00:02 2020] Hardware name: System
manufacturer System Product Name/PRIME B450M-A, BIOS 2006
11/13/2019
[Fri May 29 08:00:02 2020] RIP: 0010:tun_do_read+0x524/0x6c0
[tun]
[Fri May 29 08:00:02 2020] Code: 00 6a 01 0f b7 44 24 22 b9
10 00 00 00 48 c7 c6 cb 33 09 c1 48 c7 c7 d1 33 09 c1 83 f8
40 48 0f 4f c2 31 d2 50 e8 4c 14 df c5 <0f> 0b 58 5a 48 c7
c5 ea ff ff ff e9 d2 fc ff ff 4c 89 e2 be 04 00
[Fri May 29 08:00:02 2020] RSP: 0018:ffffaaf301dfbcb8
EFLAGS: 00010292
[Fri May 29 08:00:02 2020] RAX: 0000000000000000 RBX:
ffff88ceae6b4800 RCX: 0000000000000007
[Fri May 29 08:00:02 2020] RDX: 0000000000000000 RSI:
0000000000000096 RDI: ffff88d14e8996b0
[Fri May 29 08:00:02 2020] RBP: 000000000000004e R08:
0000000000000516 R09: 0000000000000055
[Fri May 29 08:00:02 2020] R10: 000000000000072e R11:
ffffaaf301dfba88 R12: ffffaaf301dfbe50
[Fri May 29 08:00:02 2020] R13: ffff88d0e98b8900 R14:
0000000000000000 R15: 0000000000000000
[Fri May 29 08:00:02 2020] FS:  0000000000000000(0000)
GS:ffff88d14e880000(0000) knlGS:0000000000000000
[Fri May 29 08:00:02 2020] CS:  0010 DS: 0000 ES: 0000 CR0:
0000000080050033
[Fri May 29 08:00:02 2020] CR2: 000055f6b3af2bd8 CR3:
00000003c6c84000 CR4: 0000000000340ee0
[Fri May 29 08:00:02 2020] Call Trace:
[Fri May 29 08:00:02 2020]  ? __wake_up_common+0x77/0x140
[Fri May 29 08:00:02 2020]  tun_recvmsg+0x6b/0xf0 [tun]
[Fri May 29 08:00:02 2020]  handle_rx+0x573/0x940 [vhost_net]
[Fri May 29 08:00:02 2020]  ? log_used.part.45+0x20/0x20 [vhost]
[Fri May 29 08:00:02 2020]  vhost_worker+0xcc/0x140 [vhost]
[Fri May 29 08:00:02 2020]  kthread+0x10c/0x130
[Fri May 29 08:00:02 2020]  ? kthread_park+0x80/0x80
[Fri May 29 08:00:02 2020]  ret_from_fork+0x22/0x40
[Fri May 29 08:00:02 2020] ---[ end trace 9df20668f2e81977 ]---


many thanks, L.
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