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BUG: KCSAN: data-race in get_cpu_idle_time_us / tick_irq_enter

write to 0xffff888237c1e0f8 of 8 bytes by interrupt on cpu 0:
 tick_nohz_stop_idle kernel/time/tick-sched.c:648 [inline]
 tick_nohz_irq_enter kernel/time/tick-sched.c:1377 [inline]
 tick_irq_enter+0x14a/0x240 kernel/time/tick-sched.c:1403
 sysvec_apic_timer_interrupt+0x80/0xb0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 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:115 [inline]
 acpi_idle_do_entry drivers/acpi/processor_idle.c:556 [inline]
 acpi_idle_enter+0x282/0x300 drivers/acpi/processor_idle.c:692
 cpuidle_enter_state+0x2b4/0x7d0 drivers/cpuidle/cpuidle.c:237
 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351
 call_cpuidle kernel/sched/idle.c:158 [inline]
 cpuidle_idle_call kernel/sched/idle.c:239 [inline]
 do_idle+0x1b2/0x250 kernel/sched/idle.c:306
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403
 rest_init+0xfa/0x100 init/main.c:725
 arch_call_rest_init+0xa/0xb init/main.c:881
 start_kernel+0x5e4/0x669 init/main.c:1138
 secondary_startup_64_no_verify+0xc4/0xcb

read to 0xffff888237c1e0f8 of 8 bytes by task 13390 on cpu 1:
 get_cpu_idle_time_us+0x1dd/0x1f0 kernel/time/tick-sched.c:691
 get_idle_time fs/proc/stat.c:54 [inline]
 show_stat+0x2ef/0xdd0 fs/proc/stat.c:134
 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:2068 [inline]
 io_iter_do_read fs/io_uring.c:3611 [inline]
 io_read fs/io_uring.c:3668 [inline]
 io_issue_sqe+0xb34/0x9610 fs/io_uring.c:6750
 __io_queue_sqe+0x20/0x6a0 fs/io_uring.c:7097
 io_req_task_submit+0x8b/0xf0 fs/io_uring.c:2441
 handle_tw_list fs/io_uring.c:2328 [inline]
 tctx_task_work+0x8b2/0xc90 fs/io_uring.c:2362
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:213 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x102/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000012b8b6e5a4 -> 0x00000012b8c6e2ed

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 13390 Comm: syz-executor.4 Not tainted 5.17.0-rc5-syzkaller-00004-g038101e6b2cd-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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