==================================================================
BUG: KCSAN: data-race in kvm_arch_vcpu_load / pvclock_gtod_notify

write to 0xffffffff85fdd628 of 4 bytes by interrupt on cpu 1:
 update_pvclock_gtod arch/x86/kvm/x86.c:1552 [inline]
 pvclock_gtod_notify+0xa4/0x260 arch/x86/kvm/x86.c:7126
 notifier_call_chain+0xd7/0x160 kernel/notifier.c:95
 __raw_notifier_call_chain kernel/notifier.c:396 [inline]
 raw_notifier_call_chain+0x37/0x50 kernel/notifier.c:403
 update_pvclock_gtod kernel/time/timekeeping.c:578 [inline]
 timekeeping_update+0x1b5/0x2d0 kernel/time/timekeeping.c:672
 timekeeping_advance+0x882/0xd80 kernel/time/timekeeping.c:2120
 update_wall_time+0x19/0x20 kernel/time/timekeeping.c:2137
 tick_do_update_jiffies64+0x1ae/0x260 kernel/time/tick-sched.c:94
 tick_sched_do_timer+0xd4/0xe0 kernel/time/tick-sched.c:138
 tick_sched_timer+0x43/0xe0 kernel/time/tick-sched.c:1292
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x288/0x600 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 find_watchpoint kernel/kcsan/core.c:63 [inline]
 __kcsan_check_watchpoint+0x87/0x180 kernel/kcsan/core.c:266

read to 0xffffffff85fdd628 of 4 bytes by task 19505 on cpu 0:
 kvm_check_tsc_unstable arch/x86/kvm/x86.c:1838 [inline]
 kvm_arch_vcpu_load+0x1e5/0x620 arch/x86/kvm/x86.c:3421
 kvm_sched_in+0x8e/0xc0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4227
 __fire_sched_in_preempt_notifiers kernel/sched/core.c:3029 [inline]
 fire_sched_in_preempt_notifiers kernel/sched/core.c:3035 [inline]
 finish_task_switch+0xee/0x260 kernel/sched/core.c:3227
 context_switch kernel/sched/core.c:3387 [inline]
 __schedule+0x319/0x640 kernel/sched/core.c:4069
 preempt_schedule_irq+0x57/0x90 kernel/sched/core.c:4319
 restore_regs_and_return_to_kernel+0x0/0x25
 kvm_page_track_write+0xc4/0x180 arch/x86/kvm/page_track.c:237
 emulator_write_phys+0x63/0x90 arch/x86/kvm/x86.c:5517
 write_emulate+0x37/0x50 arch/x86/kvm/x86.c:5554
 emulator_read_write_onepage+0x2d7/0x750 arch/x86/kvm/x86.c:5623
 emulator_read_write+0x178/0x330 arch/x86/kvm/x86.c:5678
 emulator_write_emulated+0x45/0x60 arch/x86/kvm/x86.c:5715
 segmented_write+0xa2/0xe0 arch/x86/kvm/emulate.c:1462

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19505 Comm: syz-executor.3 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================