kernel: TCP: mptcp_fallback_infinite

[pseu_asus]

Hi,Guys,
I have setup dual WAN on my router for over two years. Today I found in the syslog it displayed the following error msg. (The total threads was over 1200 since yesterday). So far no impact to my home network.

maven@PSU-AX56U-CM:/jffs# grep "kernel: TCP: mptcp_fallback_infinite" /tmp/syslog.log | more
Sep 11 20:16:00 kernel: TCP: mptcp_fallback_infinite 0xeabb8f9a will fallback - pi 1, src 103.84.217.83 dst 207.117.162.5 from tcp_rcv_state_process+0x1d8/0x8d8
Sep 11 20:17:00 kernel: TCP: mptcp_fallback_infinite 0xaca797fb will fallback - pi 1, src 103.84.217.83 dst 194.119.104.189 from tcp_rcv_state_process+0x1d8/0x8d8
Sep 11 20:18:00 kernel: TCP: mptcp_fallback_infinite 0xdc72aab1 will fallback - pi 1, src 103.167.135.74 dst 207.117.162.5 from tcp_rcv_state_process+0x1d8/0x8d8
Sep 11 20:19:00 kernel: TCP: mptcp_fallback_infinite 0xd0986f04 will fallback - pi 1, src 103.167.135.74 dst 194.119.104.189 from tcp_rcv_state_process+0x1d8/0x8d8
Sep 11 20:20:00 kernel: TCP: mptcp_fallback_infinite 0xdc4368e6 will fallback - pi 1, src 103.167.135.74 dst 207.117.162.5 from tcp_rcv_state_process+0x1d8/0x8d8
Sep 11 20:21:00 kernel: TCP: mptcp_fallback_infinite 0xf6b1425f will fallback - pi 1, src 103.84.217.83 dst 194.119.104.189 from tcp_rcv_state_process+0x1d8/0x8d8
Sep 11 20:22:01 kernel: TCP: mptcp_fallback_infinite 0xffc0738d will fallback - pi 1, src 103.167.135.74 dst 220.181.38.149 from tcp_rcv_state_process+0x1d8/0x8d8
Sep 11 20:23:01 kernel: TCP: mptcp_fallback_infinite 0xd63dbc2b will fallback - pi 1, src 103.84.217.83 dst 220.181.38.149 from tcp_rcv_state_process+0x1d8/0x8d8

I had a look in the search engine, the results indicated something related to the Linux kernel. I don't have any clue on it.
Any thoughts on this?

Here is my router WAN setup:

WAN connection type: PPPoE
Enable NAT: Yes, Symmetric
Enable UPnP: No
Get the WAN IP automatically: Yes
Dual WAN Mode: NLB
Load Balance Configuration: 1:1
Enable Port Trigger: No
Enable Port Forwarding: OFF
Enable DMZ: No
Enable the DDNS Client: No
PPTP Passthrough,L2TP Passthrough,IPSec Passthrough: No
RTSP Passthrough,H.323 Passthrough,SIP Passthrough: Yes
PPPoE Relay: No
Enable Firewall: Yes
Enable DoS Protection: Yes
Log packets type: none
Respond ICMP echo from WAN: No
Enable IPv6 Firewall: Yes
Enable URL Filter: No
Enable Keyword Filter: No
Enable Network Services Filter: No

maven@PSU-AX56U-CM:/jffs# free
             total       used       free     shared    buffers     cached
Mem:        510384     224632     285752       9964       3964      26984
-/+ buffers/cache:     193684     316700
Swap:            0          0          0

maven@PSU-AX56U-CM:/jffs# uname -r
4.1.52

 

[pseu_asus]

Now the

mptcp_fallback_infinite

keeps increasing in syslog.
Run

service restart_wan

did not clear it.
Should I reboot the router to have a try?