syzbot

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BUG: KCSAN: data-race in get_cpu_iowait_time_us / tick_irq_enter

write to 0xffff888237c1e07c of 1 bytes by interrupt on cpu 0:
 tick_nohz_stop_idle kernel/time/tick-sched.c:666 [inline]
 tick_nohz_irq_enter kernel/time/tick-sched.c:1430 [inline]
 tick_irq_enter+0x152/0x210 kernel/time/tick-sched.c:1456
 sysvec_apic_timer_interrupt+0x80/0xb0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x1b/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:111 [inline]
 acpi_idle_do_entry drivers/acpi/processor_idle.c:554 [inline]
 acpi_idle_enter+0x283/0x310 drivers/acpi/processor_idle.c:691
 cpuidle_enter_state+0x2ee/0x7a0 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x1b2/0x250 kernel/sched/idle.c:303
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400
 rest_init+0xe8/0xf0 init/main.c:726
 start_kernel+0x0/0x656 init/main.c:882
 start_kernel+0x5d1/0x656 init/main.c:1137
 secondary_startup_64_no_verify+0xcf/0xdb

read to 0xffff888237c1e07c of 1 bytes by task 30365 on cpu 1:
 get_cpu_iowait_time_us+0x68/0x1d0
 get_iowait_time fs/proc/stat.c:70 [inline]
 show_stat+0x37f/0xe60 fs/proc/stat.c:135
 seq_read_iter+0x2c3/0x8e0 fs/seq_file.c:230
 proc_reg_read_iter+0xd4/0x170 fs/proc/inode.c:296
 call_read_iter include/linux/fs.h:2052 [inline]
 io_iter_do_read fs/io_uring.c:4307 [inline]
 io_read fs/io_uring.c:4426 [inline]
 io_issue_sqe+0x22f3/0xa9b0 fs/io_uring.c:8408
 io_queue_sqe fs/io_uring.c:8791 [inline]
 io_submit_sqe+0x2cfa/0x3ad0 fs/io_uring.c:9055
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9166
 __do_sys_io_uring_enter fs/io_uring.c:12098 [inline]
 __se_sys_io_uring_enter+0x24b/0xd60 fs/io_uring.c:12024
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:12024
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

value changed: 0x0d -> 0x19

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 30365 Comm: syz-executor.5 Not tainted 5.19.0-rc1-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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