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BUG: KCSAN: data-race in ktime_get_ts64 / timekeeping_advance

write to 0xffffffff86d962c8 of 280 bytes by interrupt on cpu 1:
 timekeeping_advance+0x88e/0xd80 include/linux/string.h:381
 update_wall_time+0x15/0x20 kernel/time/timekeeping.c:2137
 tick_do_update_jiffies64+0x1e5/0x2a0 kernel/time/tick-sched.c:98
 tick_sched_do_timer+0xc7/0xd0 kernel/time/tick-sched.c:142
 tick_sched_timer+0x3f/0xd0 kernel/time/tick-sched.c:1307
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829

read to 0xffffffff86d96348 of 16 bytes by task 18201 on cpu 0:
 ktime_get_ts64+0x15a/0x2c0 kernel/time/timekeeping.c:893
 posix_get_monotonic_timespec+0x45/0x110 kernel/time/posix-timers.c:198
 __do_sys_clock_gettime kernel/time/posix-timers.c:1091 [inline]
 __se_sys_clock_gettime kernel/time/posix-timers.c:1081 [inline]
 __x64_sys_clock_gettime+0xae/0x160 kernel/time/posix-timers.c:1081
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 18201 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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