syzbot

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BUG: KCSAN: data-race in get_cpu_iowait_time_us / tick_irq_enter

read-write to 0xffff888237d1f248 of 8 bytes by interrupt on cpu 1:
 tick_nohz_stop_idle kernel/time/tick-sched.c:664 [inline]
 tick_nohz_irq_enter kernel/time/tick-sched.c:1429 [inline]
 tick_irq_enter+0x12b/0x220 kernel/time/tick-sched.c:1455
 common_interrupt+0x93/0xc0 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:640
 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:112 [inline]
 acpi_idle_do_entry drivers/acpi/processor_idle.c:570 [inline]
 acpi_idle_enter+0x282/0x360 drivers/acpi/processor_idle.c:707
 cpuidle_enter_state+0x2de/0x9c0 drivers/cpuidle/cpuidle.c:239
 cpuidle_enter+0x40/0x60 drivers/cpuidle/cpuidle.c:356
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x19a/0x240 kernel/sched/idle.c:303
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:400
 start_secondary+0x7c/0x80 arch/x86/kernel/smpboot.c:264
 secondary_startup_64_no_verify+0xcf/0xdb

read to 0xffff888237d1f248 of 8 bytes by task 6569 on cpu 0:
 get_cpu_iowait_time_us+0x1b5/0x1d0 kernel/time/tick-sched.c:748
 get_iowait_time fs/proc/stat.c:70 [inline]
 show_stat+0x1c6/0xcf0 fs/proc/stat.c:135
 seq_read_iter+0x2bc/0x8f0 fs/seq_file.c:230
 proc_reg_read_iter+0xe8/0x180 fs/proc/inode.c:301
 call_read_iter include/linux/fs.h:2183 [inline]
 io_iter_do_read io_uring/rw.c:643 [inline]
 io_read+0x2e6/0xcb0 io_uring/rw.c:766
 io_issue_sqe+0x142/0x660 io_uring/io_uring.c:1851
 io_queue_sqe io_uring/io_uring.c:2023 [inline]
 io_submit_sqe io_uring/io_uring.c:2284 [inline]
 io_submit_sqes+0x694/0x1030 io_uring/io_uring.c:2395
 __do_sys_io_uring_enter io_uring/io_uring.c:3343 [inline]
 __se_sys_io_uring_enter+0x1e7/0x1680 io_uring/io_uring.c:3275
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3275
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000fd1c1aca -> 0x00000000fd23dd5a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6569 Comm: syz-executor.4 Not tainted 6.2.0-rc7-syzkaller-00199-g420b2d431d18-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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