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BUG: KCSAN: data-race in virtnet_poll_tx / virtqueue_add

write to 0xffff88821ab3f86c of 4 bytes by interrupt on cpu 0:
 virtqueue_add_split drivers/virtio/virtio_ring.c:528 [inline]
 virtqueue_add+0x958/0x1a80 drivers/virtio/virtio_ring.c:1706
 virtqueue_add_outbuf+0x4b/0x70 drivers/virtio/virtio_ring.c:1763
 xmit_skb drivers/net/virtio_net.c:1548 [inline]
 start_xmit+0x5b3/0xbe0 drivers/net/virtio_net.c:1571
 __netdev_start_xmit include/linux/netdevice.h:4447 [inline]
 netdev_start_xmit include/linux/netdevice.h:4461 [inline]
 xmit_one net/core/dev.c:3420 [inline]
 dev_hard_start_xmit+0xef/0x430 net/core/dev.c:3436
 sch_direct_xmit+0x2b3/0x900 net/sched/sch_generic.c:313
 __dev_xmit_skb net/core/dev.c:3621 [inline]
 __dev_queue_xmit+0x13e2/0x1ba0 net/core/dev.c:3982
 dev_queue_xmit+0x21/0x30 net/core/dev.c:4046
 neigh_hh_output include/net/neighbour.h:500 [inline]
 neigh_output include/net/neighbour.h:509 [inline]
 ip_finish_output2+0x89b/0xea0 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:308 [inline]
 __ip_finish_output+0x23a/0x490 net/ipv4/ip_output.c:290
 ip_finish_output+0x41/0x160 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_output+0xfe/0x230 net/ipv4/ip_output.c:432
 dst_output include/net/dst.h:436 [inline]
 ip_local_out+0x74/0x90 net/ipv4/ip_output.c:125
 __ip_queue_xmit+0x3a8/0xa40 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x45/0x60 include/net/ip.h:237
 __tcp_transmit_skb+0xea3/0x1df0 net/ipv4/tcp_output.c:1170
 __tcp_send_ack+0x246/0x300 net/ipv4/tcp_output.c:3697
 tcp_send_ack+0x34/0x40 net/ipv4/tcp_output.c:3703
 __tcp_ack_snd_check+0xd9/0x580 net/ipv4/tcp_input.c:5243
 tcp_rcv_established+0xce9/0xf50 net/ipv4/tcp_input.c:5674
 tcp_v4_do_rcv+0x3b5/0x520 net/ipv4/tcp_ipv4.c:1562
 tcp_v4_rcv+0x1b2a/0x1d20 net/ipv4/tcp_ipv4.c:1943
 ip_protocol_deliver_rcu+0x4d/0x420 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231
 NF_HOOK include/linux/netfilter.h:307 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:442 [inline]
 ip_sublist_rcv_finish+0xf8/0x140 net/ipv4/ip_input.c:549
 ip_list_rcv_finish net/ipv4/ip_input.c:599 [inline]
 ip_sublist_rcv+0x418/0x550 net/ipv4/ip_input.c:607
 ip_list_rcv+0x2f5/0x322 net/ipv4/ip_input.c:642
 __netif_receive_skb_list_ptype net/core/dev.c:5193 [inline]
 __netif_receive_skb_list_ptype net/core/dev.c:5182 [inline]
 __netif_receive_skb_list_core+0x350/0x5c0 net/core/dev.c:5241
 __netif_receive_skb_list net/core/dev.c:5293 [inline]
 netif_receive_skb_list_internal+0x5d8/0x830 net/core/dev.c:5388
 gro_normal_list.part.0+0x3a/0xb0 net/core/dev.c:5810
 gro_normal_list net/core/dev.c:5823 [inline]
 gro_normal_one+0x162/0x170 net/core/dev.c:5822
 napi_skb_finish net/core/dev.c:5838 [inline]
 napi_gro_receive+0x288/0x300 net/core/dev.c:5870
 receive_buf+0x284/0x30b0 drivers/net/virtio_net.c:1061
 virtnet_receive drivers/net/virtio_net.c:1323 [inline]
 virtnet_poll+0x436/0x7d0 drivers/net/virtio_net.c:1428
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x3ae/0xa90 net/core/dev.c:6600
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 do_IRQ+0x81/0x130 arch/x86/kernel/irq.c:263
 ret_from_intr+0x0/0x21

read to 0xffff88821ab3f86c of 4 bytes by interrupt on cpu 1:
 virtnet_poll_tx+0x177/0x1d0 drivers/net/virtio_net.c:1498
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x3ae/0xa90 net/core/dev.c:6600
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 do_IRQ+0x81/0x130 arch/x86/kernel/irq.c:263
 ret_from_intr+0x0/0x21
 __sanitizer_cov_trace_const_cmp4+0x3/0x20 kernel/kcov.c:274
 __vfs_read+0xb1/0xc0 fs/read_write.c:427
 vfs_read fs/read_write.c:461 [inline]
 vfs_read+0x143/0x2c0 fs/read_write.c:446
 ksys_read+0x17b/0x1b0 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read fs/read_write.c:595 [inline]
 __x64_sys_read+0x4c/0x60 fs/read_write.c:595
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8103 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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