【标题描述】
虚拟机内使用欧拉内核，netfilter模块ipt_do_table出现Oops
【环境信息】
硬件信息：
1） 鲲鹏920
软件信息：
1） host OS内核：commit 0a3bc9281e6c2a79fc72b8ac37ed8cec3b19f426 (HEAD -> kernel-4.19, tag: 4.19.208-2111.1.0
2） qemu-kvm、libvirt
【问题复现步骤】
概率出现，复现概率无规律，概率较小。
【预期结果】
不出现Oops
【实际结果】
概率出现
【附件信息】
[144485.655250] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[144485.655762] Mem abort info:
[144485.655937] ESR = 0x96000007
[144485.656136] Exception class = DABT (current EL), IL = 32 bits
[144485.656448] SET = 0, FnV = 0
[144485.656627] EA = 0, S1PTW = 0
[144485.656809] Data abort info:
[144485.656981] ISV = 0, ISS = 0x00000007
[144485.657195] CM = 0, WnR = 0
[144485.657371] user pgtable: 64k pages, 48-bit VAs, pgdp = 000000009b92e640
[144485.657726] [0000000000000000] pgd=0000000782980003, pud=0000000782980003, pmd=0000000782990003, pte=0000000000000000
[144485.658272] Internal error: Oops: 96000007 [#1] SMP
[144485.658530] Modules linked in: veth xt_TCPMSS ip_set_hash_ip ip_set_hash_net xt_set ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_bitmap_port ip_set_hash_ipport dummy ip_set nf_tables nfnetlink_cttimeout openvswitch nsh nf_nat_ipv6 nf_conncount iptable_mangle xt_comment xt_mark xt_conntrack ipt_MASQUERADE nf_conntrack_netlink nfnetlink xt_addrtype iptable_filter overlay rfkill vfat fat aes_ce_blk crypto_simd cryptd aes_ce_cipher crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce sch_fq_codel br_netfilter bridge stp llc ip_vs_sh ip_vs_wrr ip_vs_rr ip_vs geneve ip6_udp_tunnel udp_tunnel iptable_nat nf_nat_ipv4 nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_tables virtio_console virtio_net net_failover failover virtio_gpu virtio_rng
[144485.661984] Process swapper/11 (pid: 0, stack limit = 0x000000006d49ea1a)
[144485.662370] CPU: 11 PID: 0 Comm: swapper/11 Kdump: loaded Not tainted 4.19.90-24.4.v2101.ky10.aarch64 #1
[144485.662891] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[144485.663272] pstate: 60400005 (nZCv daif +PAN -UAO)
[144485.663555] pc : hash_net4_test+0x44/0x398 [ip_set_hash_net]
[144485.663876] lr : hash_net4_kadt+0xd0/0x148 [ip_set_hash_net]
[144485.664194] sp : ffffecad7f36f840
[144485.664394] x29: ffffecad7f36f840 x28: ffffecad4f2adb00
[144485.664698] x27: ffffecad7f36f908 x26: 0000000000000000
[144485.664998] x25: ffff2e67c4c00600 x24: ffffecad572e3000
[144485.665301] x23: ffff2e67c65c0fcc x22: 0000000000000000
[144485.665602] x21: ffffecad7f36f9d0 x20: ffffecad7f36f910
[144485.665912] x19: ffffecad7f36f9c8 x18: 0000000000000000
[144485.666213] x17: 0000000000000000 x16: ffff2e68225f0a90
[144485.666513] x15: 0000000000000000 x14: 160000009afb1d00
[144485.666815] x13: 0000000000000030 x12: 0f67fc1936b920fb
[144485.667116] x11: ffff2e67c4c00600 x10: ffffecad44e69000
[144485.667417] x9 : 0000000000000001 x8 : 0000000000000000
[144485.667729] x7 : 000000000a0010ac x6 : ffff2e67c45f2218
[144485.668029] x5 : 000000000a0010ac x4 : 0000000000000000
[144485.668330] x3 : ffffecad7f36f9d0 x2 : ffffecad7f36f910
[144485.668631] x1 : ffffecad7f36f908 x0 : 0000000000000020
[144485.668932] Call trace:
[144485.669090] hash_net4_test+0x44/0x398 [ip_set_hash_net]
[144485.669393] hash_net4_kadt+0xd0/0x148 [ip_set_hash_net]
[144485.669705] ip_set_test+0xbc/0x230 [ip_set]
[144485.669965] set_match_v4+0xac/0xd0 [xt_set]
[144485.670217] ipt_do_table+0x32c/0x678 [ip_tables]
[144485.670490] iptable_filter_hook+0x30/0x40 [iptable_filter]
[144485.670831] nf_hook_slow+0x50/0x100
[144485.671087] ip_local_deliver+0xd4/0xe8
[144485.671373] ip_rcv_finish+0x90/0xb0
[144485.671629] ip_rcv+0x50/0xb0
[144485.671850] __netif_receive_skb_one_core+0x58/0x68
[144485.672181] __netif_receive_skb+0x28/0x80
[144485.672465] netif_receive_skb_internal+0x3c/0xa8
[144485.672785] napi_gro_receive+0xf8/0x170
[144485.673062] receive_buf+0xec/0xa08 [virtio_net]
[144485.673378] virtnet_poll+0x144/0x310 [virtio_net]
[144485.673705] net_rx_action+0x158/0x3a0
[144485.673980] __do_softirq+0x114/0x32c
[144485.674239] irq_exit+0x108/0x120
[144485.674477] __handle_domain_irq+0x6c/0xc0
[144485.674760] gic_handle_irq+0x6c/0x170
[144485.675030] el1_irq+0xb8/0x140
[144485.675258] arch_cpu_idle+0x38/0x1c0
[144485.675518] default_idle_call+0x24/0x58
[144485.675794] do_idle+0x1a4/0x268
[144485.676025] cpu_startup_entry+0x28/0x78
[144485.676301] secondary_start_kernel+0x17c/0x1c8
[144485.676611] Code: d503201f f940439a 39401f60 7100801f (f9400343)
[144485.677029] SMP: stopping secondary CPUs
[144485.680150] Starting crashdump kernel...