================================================================== BUG: KCSAN: data-race in get_cpu_iowait_time_us / tick_irq_enter write to 0xffff88812c01f17c of 1 bytes by task 0 on cpu 0: tick_nohz_stop_idle kernel/time/tick-sched.c:565 [inline] tick_nohz_irq_enter kernel/time/tick-sched.c:1284 [inline] tick_irq_enter+0x16b/0x250 kernel/time/tick-sched.c:1303 irq_enter_rcu+0x2d/0x60 kernel/softirq.c:359 sysvec_apic_timer_interrupt+0x14/0xd0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 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+0x94/0x130 drivers/acpi/processor_idle.c:517 acpi_idle_enter+0x22e/0x260 drivers/acpi/processor_idle.c:648 cpuidle_enter_state+0x2b5/0x7b0 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:132 [inline] cpuidle_idle_call kernel/sched/idle.c:213 [inline] do_idle+0x1e7/0x2c0 kernel/sched/idle.c:273 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:369 rest_init+0xd8/0xe0 init/main.c:709 arch_call_rest_init+0xa/0xb start_kernel+0x602/0x6ca init/main.c:1049 secondary_startup_64_no_verify+0xa6/0xab read to 0xffff88812c01f17c of 1 bytes by task 15318 on cpu 1: get_cpu_iowait_time_us+0x6b/0x1f0 kernel/time/tick-sched.c:640 get_iowait_time fs/proc/stat.c:69 [inline] show_stat+0x2df/0xdc0 fs/proc/stat.c:132 seq_read+0x2de/0x890 fs/seq_file.c:208 pde_read fs/proc/inode.c:306 [inline] proc_reg_read+0xe1/0x1b0 fs/proc/inode.c:316 do_loop_readv_writev fs/read_write.c:742 [inline] do_iter_read+0x3b1/0x4b0 fs/read_write.c:784 vfs_readv fs/read_write.c:902 [inline] do_preadv+0x139/0x210 fs/read_write.c:994 __do_sys_preadv fs/read_write.c:1044 [inline] __se_sys_preadv fs/read_write.c:1039 [inline] __x64_sys_preadv+0x54/0x60 fs/read_write.c:1039 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15318 Comm: syz-executor.0 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================