syzbot

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BUG: KCSAN: data-race in get_cpu_iowait_time_us / tick_nohz_idle_enter

write to 0xffff888237d19d34 of 1 bytes by task 0 on cpu 1:
 tick_nohz_idle_enter+0x5e/0xb0 kernel/time/tick-sched.c:1113
 do_idle+0x3d/0x240 kernel/sched/idle.c:280
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403
 secondary_startup_64_no_verify+0xb0/0xbb

read to 0xffff888237d19d34 of 1 bytes by task 26955 on cpu 0:
 get_cpu_iowait_time_us+0x6b/0x1f0 kernel/time/tick-sched.c:724
 get_iowait_time fs/proc/stat.c:70 [inline]
 show_stat+0x354/0xdb0 fs/proc/stat.c:135
 seq_read_iter+0x2e1/0x930 fs/seq_file.c:230
 proc_reg_read_iter+0xd6/0x170 fs/proc/inode.c:296
 call_read_iter include/linux/fs.h:2157 [inline]
 aio_read+0x1c1/0x280 fs/aio.c:1538
 __io_submit_one fs/aio.c:1835 [inline]
 io_submit_one+0x7fb/0x1350 fs/aio.c:1880
 __do_sys_io_submit fs/aio.c:1939 [inline]
 __se_sys_io_submit+0xf5/0x260 fs/aio.c:1909
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1909
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x05

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26955 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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