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BUG: KCSAN: data-race in ktime_get_ts64 / timekeeping_advance

write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0:
 timekeeping_advance+0x88e/0xd80 include/linux/string.h:381
 update_wall_time+0x15/0x20 kernel/time/timekeeping.c:2136
 tick_do_update_jiffies64+0x1e5/0x2a0 kernel/time/tick-sched.c:101
 tick_sched_do_timer+0xc7/0xd0 kernel/time/tick-sched.c:147
 tick_sched_timer+0x3f/0xd0 kernel/time/tick-sched.c:1313
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 matching_access kernel/kcsan/encoding.h:90 [inline]
 find_watchpoint kernel/kcsan/core.c:127 [inline]
 check_access kernel/kcsan/core.c:566 [inline]
 __tsan_read8+0x27/0x110 kernel/kcsan/core.c:770
 vm_normal_page+0xbd/0x220 mm/memory.c:634
 queue_pages_pte_range+0x6a3/0xa60 mm/mempolicy.c:546
 walk_pmd_range mm/pagewalk.c:89 [inline]
 walk_pud_range mm/pagewalk.c:160 [inline]
 walk_p4d_range mm/pagewalk.c:193 [inline]
 walk_pgd_range mm/pagewalk.c:229 [inline]
 __walk_page_range+0xa6e/0x1550 mm/pagewalk.c:331
 walk_page_range+0x14c/0x280 mm/pagewalk.c:427
 queue_pages_range mm/mempolicy.c:756 [inline]
 migrate_to_node mm/mempolicy.c:1112 [inline]
 do_migrate_pages.part.0+0x2df/0x3f0 mm/mempolicy.c:1217
 do_migrate_pages mm/mempolicy.c:1139 [inline]
 kernel_migrate_pages+0x381/0x420 mm/mempolicy.c:1604
 __do_sys_migrate_pages mm/mempolicy.c:1623 [inline]
 __se_sys_migrate_pages mm/mempolicy.c:1619 [inline]
 __x64_sys_migrate_pages+0x5a/0x70 mm/mempolicy.c:1619
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff88ae90e8 of 8 bytes by task 21538 on cpu 1:
 timekeeping_delta_to_ns kernel/time/timekeeping.c:363 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:375 [inline]
 ktime_get_ts64+0x12c/0x2c0 kernel/time/timekeeping.c:892
 posix_get_monotonic_timespec+0x45/0x110 kernel/time/posix-timers.c:199
 __do_sys_clock_gettime kernel/time/posix-timers.c:1092 [inline]
 __se_sys_clock_gettime kernel/time/posix-timers.c:1082 [inline]
 __x64_sys_clock_gettime+0xae/0x160 kernel/time/posix-timers.c:1082
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 21538 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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