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BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event

write to 0xffffffff85f05590 of 4 bytes by task 0 on cpu 1:
 tick_nohz_stop_tick kernel/time/tick-sched.c:775 [inline]
 __tick_nohz_idle_stop_tick kernel/time/tick-sched.c:967 [inline]
 tick_nohz_idle_stop_tick+0x525/0x670 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

read to 0xffffffff85f05590 of 4 bytes by task 0 on cpu 0:
 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
 rest_init+0xec/0xf6 init/main.c:632
 arch_call_rest_init+0x17/0x37
 start_kernel+0xcd4/0xcfc init/main.c:971
 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:490
 x86_64_start_kernel+0x72/0x76 arch/x86/kernel/head64.c:471
 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
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