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

write to 0xffffffff85d056d0 of 4 bytes by interrupt on cpu 1:
 tick_sched_do_timer+0xb4/0xd0 kernel/time/tick-sched.c:136
 tick_sched_timer+0x3f/0xd0 kernel/time/tick-sched.c:1307
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 arch_local_irq_enable arch/x86/include/asm/paravirt.h:762 [inline]
 internal_get_user_pages_fast mm/gup.c:2455 [inline]
 get_user_pages_fast+0x199/0x350 mm/gup.c:2505
 get_futex_key+0x189/0xa40 kernel/futex.c:568
 futex_wait_setup+0x6f/0x210 kernel/futex.c:2752
 futex_wait+0x14a/0x400 kernel/futex.c:2806
 do_futex+0xe2/0x1820 kernel/futex.c:3882
 __do_sys_futex kernel/futex.c:3943 [inline]
 __se_sys_futex kernel/futex.c:3911 [inline]
 __x64_sys_futex+0x2dc/0x410 kernel/futex.c:3911
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 0:
 tick_nohz_next_event+0x192/0x350 kernel/time/tick-sched.c:740
 __tick_nohz_idle_stop_tick kernel/time/tick-sched.c:958 [inline]
 tick_nohz_idle_stop_tick+0x3b9/0x680 kernel/time/tick-sched.c:988
 cpuidle_idle_call kernel/sched/idle.c:151 [inline]
 do_idle+0x1ad/0x290 kernel/sched/idle.c:269
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361
 rest_init+0xe4/0xeb init/main.c:632
 arch_call_rest_init+0x13/0x2b
 start_kernel+0xcc2/0xceb init/main.c:971
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242

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