================================================================== BUG: KCSAN: data-race in get_cpu_idle_time_us / tick_nohz_idle_enter write to 0xffff88812c02030c of 1 bytes by task 0 on cpu 0: tick_nohz_idle_enter+0x8f/0x100 kernel/time/tick-sched.c:1024 do_idle+0x38/0x290 kernel/sched/idle.c:244 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 rest_init+0xe4/0xeb init/main.c:667 arch_call_rest_init+0x13/0x2b start_kernel+0x7fe/0x823 init/main.c:1005 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 read to 0xffff88812c02030c of 1 bytes by task 17332 on cpu 1: get_cpu_idle_time_us+0xe5/0x170 kernel/time/tick-sched.c:596 get_idle_time.isra.0+0x65/0x90 fs/proc/stat.c:53 show_stat+0x261/0xa50 fs/proc/stat.c:131 seq_read+0x2ef/0x940 fs/seq_file.c:206 pde_read fs/proc/inode.c:292 [inline] proc_reg_read+0xb3/0x1b0 fs/proc/inode.c:302 do_loop_readv_writev fs/read_write.c:715 [inline] do_loop_readv_writev fs/read_write.c:702 [inline] do_iter_read+0x33f/0x3a0 fs/read_write.c:936 vfs_readv+0x9c/0xf0 fs/read_write.c:1054 do_preadv+0x129/0x1c0 fs/read_write.c:1146 __do_sys_preadv fs/read_write.c:1196 [inline] __se_sys_preadv fs/read_write.c:1191 [inline] __x64_sys_preadv+0x5e/0x80 fs/read_write.c:1191 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17332 Comm: syz-executor.0 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================