================================================================== BUG: KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer write to 0xffffffff838c5ee0 of 4 bytes by task 0 on cpu 0: tick_nohz_stop_tick+0x99/0x3e0 kernel/time/tick-sched.c:873 __tick_nohz_idle_stop_tick kernel/time/tick-sched.c:1062 [inline] tick_nohz_idle_stop_tick+0x15d/0x310 kernel/time/tick-sched.c:1083 cpuidle_idle_call kernel/sched/idle.c:235 [inline] do_idle+0x186/0x240 kernel/sched/idle.c:306 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403 rest_init+0xee/0x100 init/main.c:719 arch_call_rest_init+0xa/0xb start_kernel+0x5ae/0x633 init/main.c:1125 secondary_startup_64_no_verify+0xb1/0xbb read to 0xffffffff838c5ee0 of 4 bytes by interrupt on cpu 1: tick_sched_do_timer kernel/time/tick-sched.c:187 [inline] tick_sched_timer+0x35/0x210 kernel/time/tick-sched.c:1414 __run_hrtimer+0x160/0x480 kernel/time/hrtimer.c:1685 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline] hrtimer_interrupt+0x380/0xaf0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x6f/0x1c0 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x64/0x80 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:553 [inline] acpi_idle_enter+0x258/0x2e0 drivers/acpi/processor_idle.c:688 cpuidle_enter_state+0x2b6/0x750 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x1a3/0x240 kernel/sched/idle.c:306 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403 secondary_startup_64_no_verify+0xb1/0xbb value changed: 0x00000000 -> 0xffffffff Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 0 Comm: swapper/1 Tainted: G W 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================