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BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer

write to 0xffffffff86fc1060 of 4 bytes by interrupt on cpu 1:
 tick_sched_do_timer kernel/time/tick-sched.c:191 [inline]
 tick_sched_timer+0x1f5/0x210 kernel/time/tick-sched.c:1362
 __run_hrtimer+0x163/0x460 kernel/time/hrtimer.c:1519
 __hrtimer_run_queues kernel/time/hrtimer.c:1583 [inline]
 hrtimer_interrupt+0x36e/0xa30 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1102
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x6f/0x90 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
 arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
 kcsan_setup_watchpoint+0x1fc/0x4d0 kernel/kcsan/core.c:591
 net_hash_mix include/net/netns/hash.h:9 [inline]
 inet_ehashfn+0x52/0x130 net/ipv4/inet_hashtables.c:40
 __inet_lookup_established+0x57/0x3d0 net/ipv4/inet_hashtables.c:403
 tcp_v4_early_demux+0x1ff/0x3b0 net/ipv4/tcp_ipv4.c:1740
 ip_rcv_finish_core+0x681/0x9f0 net/ipv4/ip_input.c:339
 ip_list_rcv_finish net/ipv4/ip_input.c:582 [inline]
 ip_sublist_rcv+0x1f5/0x590 net/ipv4/ip_input.c:608
 ip_list_rcv+0x262/0x290 net/ipv4/ip_input.c:643
 __netif_receive_skb_list_ptype net/core/dev.c:5366 [inline]
 __netif_receive_skb_list_core+0x34b/0x450 net/core/dev.c:5414
 __netif_receive_skb_list+0x262/0x2e0 net/core/dev.c:5466
 netif_receive_skb_list_internal+0xda/0x330 net/core/dev.c:5576
 gro_normal_list net/core/dev.c:5730 [inline]
 napi_complete_done+0x1b2/0x420 net/core/dev.c:6455
 virtqueue_napi_complete+0x28/0x80 drivers/net/virtio_net.c:334
 virtnet_poll+0x65f/0x790 drivers/net/virtio_net.c:1460
 napi_poll+0x181/0x630 net/core/dev.c:6805
 net_rx_action+0x17a/0x490 net/core/dev.c:6888
 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420
 common_interrupt+0xb5/0x130 arch/x86/kernel/irq.c:239
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:620

read to 0xffffffff86fc1060 of 4 bytes by task 0 on cpu 0:
 tick_nohz_next_event+0x217/0x300 kernel/time/tick-sched.c:802
 tick_nohz_get_sleep_length+0x121/0x280 kernel/time/tick-sched.c:1148
 menu_select+0x2f6/0x1000 drivers/cpuidle/governors/menu.c:283
 cpuidle_select+0x3d/0x50 drivers/cpuidle/cpuidle.c:322
 cpuidle_idle_call kernel/sched/idle.c:232 [inline]
 do_idle+0x15f/0x230 kernel/sched/idle.c:299
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:396
 rest_init+0xd7/0xe0 init/main.c:720
 arch_call_rest_init+0xa/0xb
 start_kernel+0x5a1/0x626 init/main.c:1061
 secondary_startup_64_no_verify+0xb0/0xbb

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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