==================================================================
BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64

write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0:
 tick_do_update_jiffies64+0x105/0x260 kernel/time/tick-sched.c:73
 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

read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1:
 tick_do_update_jiffies64+0x2b/0x260 kernel/time/tick-sched.c:62
 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
 should_watch kernel/kcsan/core.c:188 [inline]
 __kcsan_setup_watchpoint+0xa8/0x510 kernel/kcsan/core.c:348
 __tsan_read1 kernel/kcsan/kcsan.c:28 [inline]
 __tsan_read1+0x2c/0x30 kernel/kcsan/kcsan.c:28
 __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:54 [inline]
 nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:59 [inline]
 __nf_ct_ext_find include/net/netfilter/nf_conntrack_extend.h:64 [inline]
 nfct_seqadj include/net/netfilter/nf_conntrack_seqadj.h:26 [inline]
 nf_ct_seq_offset+0x48/0xd0 net/netfilter/nf_conntrack_seqadj.c:224
 tcp_in_window net/netfilter/nf_conntrack_proto_tcp.c:492 [inline]
 nf_conntrack_tcp_packet+0x5d9/0x3390 net/netfilter/nf_conntrack_proto_tcp.c:1091
 nf_conntrack_handle_packet net/netfilter/nf_conntrack_core.c:1632 [inline]
 nf_conntrack_in+0x410/0xa80 net/netfilter/nf_conntrack_core.c:1726
 ipv4_conntrack_in+0x27/0x40 net/netfilter/nf_conntrack_proto.c:178

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================