mtk_soc_eth 1e100000.ethernet eth0: port 4 link down
mtk_soc_eth 1e100000.ethernet eth0: port 4 link up
------------[ cut here ]------------
WARNING: CPU: 2 PID: 0 at /home/seg/DEV/mt7621/src/router/private/compat-wireless-2017-09-03/net/mac80211/sta_info.c:1909 _598+0x110/0x214 [mac80211]
STA 38:78:62:7d:a4:65 AC 0 txq pending airtime underflow: 4294966992, 304
Modules linked in: nf_nat_pptp nf_conntrack_pptp nf_nat_proto_gre nf_conntrack_proto_gre fast_classifier mt7615e mt76 mac80211 compat [last unloaded: nf_conntrack_proto_gre]
CPU: 2 PID: 0 Comm: swapper/2 Tainted: G        W       4.14.170 #184
Stack : 00000000 00000200 872dd630 8007e0a4 80490000 8048ac0c 80610000 805ace24
        80586c9c 87c0dc74 87c3541c 805ee787 805809e4 00000001 87c0dc18 805f4018
        00000000 00000000 80650000 00000000 81147bb8 00000135 00000007 00000000
        00000000 80660000 80660000 20202020 00000000 80610000 00000000 872078ac
        87297244 00000775 00000000 00000200 00000008 8022f688 00000008 80650008
        ...
Call Trace:
[<800153a0>] show_stack+0x58/0x100
[<804376b4>] dump_stack+0xa4/0xe0
[<80034f90>] __warn+0xe4/0x144
[<80034bcc>] warn_slowpath_fmt+0x30/0x3c
[<872078ac>] _598+0x110/0x214 [mac80211]
[<87203180>] _634+0xb00/0xdc4 [mac80211]
---[ end trace 618b4e1e1832c2e0 ]---