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BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer

write to 0xffffffff87f59910 of 4 bytes by interrupt on cpu 1:
 tick_sched_do_timer kernel/time/tick-sched.c:141 [inline]
 tick_sched_timer+0x214/0x230 kernel/time/tick-sched.c:1321
 __run_hrtimer+0x154/0x4b0 kernel/time/hrtimer.c:1520
 __hrtimer_run_queues kernel/time/hrtimer.c:1584 [inline]
 hrtimer_interrupt+0x37c/0xa40 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0xa3/0x280 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0x80/0xd0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:592
 __tsan_read8+0x0/0x180 kernel/kcsan/core.c:604
 do_wait_thread kernel/exit.c:1380 [inline]
 do_wait+0x1ce/0x4d0 kernel/exit.c:1449
 kernel_wait4+0x13c/0x1a0 kernel/exit.c:1621
 __do_sys_wait4 kernel/exit.c:1633 [inline]
 __se_sys_wait4 kernel/exit.c:1629 [inline]
 __x64_sys_wait4+0x7a/0x100 kernel/exit.c:1629
 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff87f59910 of 4 bytes by task 0 on cpu 0:
 tick_nohz_next_event+0x21d/0x310 kernel/time/tick-sched.c:754
 tick_nohz_get_sleep_length+0xca/0x140 kernel/time/tick-sched.c:1107
 menu_select+0x328/0x1030 drivers/cpuidle/governors/menu.c:283
 cpuidle_select+0x3d/0x50 drivers/cpuidle/cpuidle.c:317
 cpuidle_idle_call kernel/sched/idle.c:205 [inline]
 do_idle+0x1eb/0x310 kernel/sched/idle.c:276
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:372
 rest_init+0xd8/0xe0 init/main.c:705
 arch_call_rest_init+0xa/0xb
 start_kernel+0x608/0x6d0 init/main.c:1043
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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