==================================================================
BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer

write to 0xffffffff85f05590 of 4 bytes by interrupt on cpu 0:
 tick_sched_do_timer+0xc0/0xe0 kernel/time/tick-sched.c:136
 tick_sched_timer+0x43/0xe0 kernel/time/tick-sched.c:1307
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x274/0x5f0 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x22a/0x480 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 get_ctx kernel/kcsan/core.c:186 [inline]
 is_atomic kernel/kcsan/core.c:210 [inline]
 should_watch kernel/kcsan/core.c:241 [inline]
 check_access kernel/kcsan/core.c:563 [inline]
 __tsan_read8+0xd7/0x100 kernel/kcsan/core.c:700
 is_zero_pfn include/asm-generic/pgtable.h:883 [inline]
 wp_page_copy+0x118/0xf20 mm/memory.c:2491
 do_wp_page+0x192/0xd20 mm/memory.c:2812
 handle_pte_fault mm/memory.c:4049 [inline]
 __handle_mm_fault+0x1d16/0x2e00 mm/memory.c:4163
 handle_mm_fault+0x21b/0x530 mm/memory.c:4200
 do_user_addr_fault arch/x86/mm/fault.c:1442 [inline]
 do_page_fault+0x496/0xa3d arch/x86/mm/fault.c:1517
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

read to 0xffffffff85f05590 of 4 bytes by task 0 on cpu 1:
 tick_nohz_next_event+0x19d/0x370 kernel/time/tick-sched.c:740
 __tick_nohz_idle_stop_tick kernel/time/tick-sched.c:958 [inline]
 tick_nohz_idle_stop_tick+0x3c2/0x670 kernel/time/tick-sched.c:988
 cpuidle_idle_call kernel/sched/idle.c:151 [inline]
 do_idle+0x1b8/0x290 kernel/sched/idle.c:269
 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:361
 start_secondary+0x168/0x1b0 arch/x86/kernel/smpboot.c:264
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242

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