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BUG: KCSAN: data-race in ktime_get_ts64 / timekeeping_advance

write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0:
 timekeeping_advance+0x893/0xd80 include/linux/string.h:378
 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
 rep_nop arch/x86/include/asm/processor.h:650 [inline]
 delay_tsc+0x33/0xc0 arch/x86/lib/delay.c:67
 __delay arch/x86/lib/delay.c:161 [inline]
 __const_udelay+0x36/0x40 arch/x86/lib/delay.c:175
 try_check_zero+0x18d/0x1d0 kernel/rcu/srcutree.c:705
 srcu_advance_state kernel/rcu/srcutree.c:1142 [inline]
 process_srcu+0x19a/0x780 kernel/rcu/srcutree.c:1237
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269

read to 0xffffffff86040b88 of 16 bytes by task 22576 on cpu 1:
 ktime_get_ts64+0x15a/0x2c0 kernel/time/timekeeping.c:893
 posix_ktime_get_ts+0x1f/0x30 kernel/time/posix-timers.c:192
 __do_sys_clock_gettime kernel/time/posix-timers.c:1070 [inline]
 __se_sys_clock_gettime kernel/time/posix-timers.c:1060 [inline]
 __x64_sys_clock_gettime+0xb3/0x170 kernel/time/posix-timers.c:1060
 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22576 Comm: syz-executor.5 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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