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BUG: KCSAN: data-race in getboottime64 / timekeeping_advance

write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1:
 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
 arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline]
 __kcsan_setup_watchpoint+0x268/0x4a0 kernel/kcsan/core.c:424
 __tsan_read4 kernel/kcsan/kcsan.c:35 [inline]
 __tsan_read4+0x2c/0x30 kernel/kcsan/kcsan.c:35
 __rcu_read_lock+0x2a/0x50 kernel/rcu/tree_plugin.h:358
 rcu_read_lock include/linux/rcupdate.h:597 [inline]
 inet_twsk_purge+0x6e/0x2d0 net/ipv4/inet_timewait_sock.c:268
 dccp_v6_exit_batch+0x23/0x30 net/dccp/ipv6.c:1114

read to 0xffffffff86040b98 of 8 bytes by task 7507 on cpu 0:
 getboottime64+0x24/0x60 kernel/time/timekeeping.c:2154
 getboottime include/linux/timekeeping32.h:42 [inline]
 seconds_since_boot include/linux/sunrpc/cache.h:154 [inline]
 cache_clean+0x219/0x730 net/sunrpc/cache.c:434
 do_cache_clean+0x2d/0x130 net/sunrpc/cache.c:491
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269
 worker_thread+0xa0/0x800 kernel/workqueue.c:2415
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7507 Comm: kworker/0:4 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient do_cache_clean
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