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Subjectsoft lockup in __inet_lookup_established() function

I've encountered one big issue which causes infinite loop in
__inet_lookup_established() function until I reboot manually. it's
happening randomly among thousands of machines with the 4.19 kernel
running. Once the soft lockup issue is triggered, whatever I try I
still cannot ping or ssh to the machine anymore until reboot.

Does anyone have any clue on how to dig into this part of code? I
highly suspect that it has something to do with the corruption of
nulls_list, so the lookup of sk could never break the infinite loop of

These call traces are totally identical attached below:
[1048271.465028] watchdog: BUG: soft lockup - CPU#20 stuck for 22s!
[1048271.473669] Modules linked in: vxlan ip6_udp_tunnel udp_tunnel
udp_diag tcp_diag inet_diag nf_conntrack_netlink nfnetlink
br_netfilter bridge stp llc xt_statistic xt_nat ipt_MASQUERADE
ipt_REJECT nf_reject_ipv4 xt_mark xt_addrtype xt_comment xt_conntrack
[1048271.553597] RIP: 0010:__inet_lookup_established+0x5a/0x190
[1048271.660309] Call Trace:
[1048271.663135] <IRQ>
[1048271.665432] tcp_v4_early_demux+0xaa/0x150
[1048271.669812] ip_rcv_finish+0x171/0x410
[1048271.673941] ip_rcv+0x273/0x362
[1048271.677360] ? inet_add_protocol.cold.1+0x1e/0x1e
[1048271.682354] __netif_receive_skb_core+0xac2/0xbb0
[1048271.687351] ? inet_gro_receive+0x22a/0x2d0
[1048271.692001] ? ktime_get_with_offset+0x4d/0xc0
[1048271.696725] netif_receive_skb_internal+0x42/0xf0
[1048271.701717] napi_gro_receive+0xba/0xe0
[1048271.705839] receive_buf+0x165/0xa50 [virtio_net]
[1048271.710839] ? receive_buf+0x165/0xa50 [virtio_net]
[1048271.716053] ? vring_unmap_one+0x16/0x80
[1048271.720308] ? detach_buf+0x69/0x110
[1048271.724218] virtnet_poll+0xc0/0x2ea [virtio_net]
[1048271.729202] net_rx_action+0x149/0x3b0
[1048271.733234] __do_softirq+0xe3/0x30a
[1048271.737095] irq_exit+0x100/0x110
[1048271.740882] do_IRQ+0x85/0xd0
[1048271.744143] common_interrupt+0xf/0xf
[1048271.748104] </IRQ>


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