================================================================== BUG: KCSAN: data-race in add_timer_on / timer_clear_idle write to 0xffff88812c11cb24 of 1 bytes by task 0 on cpu 1: timer_clear_idle+0x2e/0x40 kernel/time/timer.c:1686 tick_nohz_idle_retain_tick+0x3e/0x40 kernel/time/tick-sched.c:1004 cpuidle_idle_call kernel/sched/idle.c:210 [inline] do_idle+0x287/0x310 kernel/sched/idle.c:276 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:372 start_secondary+0xe3/0x110 arch/x86/kernel/smpboot.c:268 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 read to 0xffff88812c11cb24 of 1 bytes by interrupt on cpu 0: trigger_dyntick_cpu kernel/time/timer.c:576 [inline] internal_add_timer kernel/time/timer.c:603 [inline] add_timer_on+0x2f9/0x3b0 kernel/time/timer.c:1185 clocksource_watchdog+0x729/0x760 kernel/time/clocksource.c:303 call_timer_fn+0x30/0x2a0 kernel/time/timer.c:1415 expire_timers+0x116/0x290 kernel/time/timer.c:1460 __run_timers+0x443/0x500 kernel/time/timer.c:1784 run_timer_softirq+0x2e/0x60 kernel/time/timer.c:1797 __do_softirq+0x198/0x360 kernel/softirq.c:292 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x5d/0x80 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:387 [inline] __irq_exit_rcu+0x115/0x120 kernel/softirq.c:417 sysvec_apic_timer_interrupt+0xba/0xd0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585 native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:525 [inline] acpi_idle_enter+0x2ff/0x680 drivers/acpi/processor_idle.c:651 cpuidle_enter_state+0x245/0x5d0 drivers/cpuidle/cpuidle.c:235 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:346 call_cpuidle kernel/sched/idle.c:126 [inline] cpuidle_idle_call kernel/sched/idle.c:214 [inline] do_idle+0x229/0x310 kernel/sched/idle.c:276 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:372 rest_init+0xd8/0xe0 init/main.c:705 arch_call_rest_init+0xa/0xb start_kernel+0x608/0x6d0 init/main.c:1043 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================