This stack trace - where to look for problem?

Hi guys,
I have this stack trace, any hint what could be the issue here?
H/W is Qotom Q555G6 6-port x86 board with i5-7200U CPU.
Thanks in advance,
shpokas

82998.294284] ------------[ cut here ]------------
[82998.299242] WARNING: CPU: 2 PID: 0 at 0xffffffff814ce8df
[82998.304966] Modules linked in: pppoe ppp_async ath10k_pci ath10k_core ath pppox ppp_generic nf_conntrack_ipv6 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_FLOWOFFLOAD xt_DSCP xt_CT xt_CLASSIFY slhc r8169 nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache nf_conntrack_netlink iptable_mangle iptable_filter ipt_ECN ip_tables e1000e crc_ccitt compat sch_cake nf_conntrack act_skbedit act_mirred em_u32 cls_u32 cls_tcindex
[82998.378090]  cls_flow cls_route cls_fw sch_tbf sch_htb sch_hfsc sch_ingress i2c_dev xt_set ip_set_list_set ip_set_hash_netiface ip_set_hash_netport ip_set_hash_netnet ip_set_hash_net ip_set_hash_netportnet ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables igb i2c_algo_bit e1000 ifb sit tunnel4 ip_tunnel tun button_hotplug ptp pps_core mii
[82998.430588] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.14.131 #0
[82998.436950] Hardware name: Default string Default string/Default string, BIOS 5.12 05/26/2019
[82998.445914] task: ffff88816a158c00 task.stack: ffffc900000ac000
[82998.452151] RIP: 0010:0xffffffff814ce8df
[82998.456298] RSP: 0018:ffff88816ed03ef8 EFLAGS: 00010297
[82998.461830] RAX: 0000000000000041 RBX: ffff888168bf97e0 RCX: 000000008aa567bf
[82998.469190] RDX: ffff888087063000 RSI: 00000000fffffe01 RDI: ffffffffa03e5475
[82998.476584] RBP: ffff88816ed03f48 R08: 0000000000000000 R09: 00000000000064bb
[82998.483976] R10: ffff888168bf6000 R11: ffff88816eff8000 R12: ffff88816ed201c0
[82998.491431] R13: 0000000000000040 R14: 00000000000000eb R15: ffff88816ed03f00
[82998.498816] FS:  0000000000000000(0000) GS:ffff88816ed00000(0000) knlGS:0000000000000000
[82998.507287] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[82998.513352] CR2: 0000000000435bce CR3: 0000000001c08004 CR4: 00000000001606e0
[82998.520803] Call Trace:
[82998.523443]  <IRQ>
[82998.525696]  0xffffffff818000ba
[82998.529070]  0xffffffff810845f2
[82998.532458]  0xffffffff816020d4
[82998.535826]  0xffffffff81600941
[82998.539209]  </IRQ>
[82998.541537] RIP: 0010:0xffffffff814710b6
[82998.545694] RSP: 0018:ffffc900000afe98 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff3c
[82998.553592] RAX: ffff88816ed1f340 RBX: 0000000000000002 RCX: 000000000000001f
[82998.560982] RDX: 00004b7c8bd7d0df RSI: 000000002f32988b RDI: 0000000000000000
[82998.568415] RBP: ffffc900000afec8 R08: 0000000000000002 R09: 000000000001eb80
[82998.575879] R10: ffffc900000afe68 R11: 00004b7c88b0abf5 R12: ffff88816ed26e40
[82998.583287] R13: 00004b7c8bd7d0df R14: ffffffff81c42f78 R15: 0000000000000000
[82998.590674]  ? 0xffffffff8147108e
[82998.594234]  0xffffffff81471162
[82998.597577]  0xffffffff810ac793
[82998.600976]  0xffffffff810ac930
[82998.604313]  0xffffffff810acb0f
[82998.607682]  0xffffffff8103eb50
[82998.611064]  0xffffffff810000d5
[82998.614399] Code: 48 8b 43 10 48 89 5b 08 44 8b 6b 18 a8 01 74 14 48 8b 43 20 44 89 ee 48 89 df e8 2d 37 33 00 41 29 c6 eb 02 31 c0 41 39 c5 7d 02 <0f> 0b 41 39 c5 7f 73 48 8b 43 10 a8 04 74 0c 31 f6 48 89 df e8 
[82998.633957] ---[ end trace 0889159e37ff6a37 ]---

Not a lot to go on there! At least it’s “only a warning”.

Any hints of issues with your swap drive?

Oh, indeed, I have a SSD disk, and 4 GB of RAM, but it never occurred to me that I may need swap partition set.
Now I created and mounted one, let's see if this "warning" will go away.
Thanks for the hint!

# free
             total       used       free     shared    buffers     cached
Mem:       3955488     156764    3798724      22408       4884      45532
-/+ buffers/cache:     106348    3849140
Swap:       524284          0     524284