syzbot

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BUG: KCSAN: data-race in print_cpu / tick_nohz_idle_enter

read-write to 0xffff888237c1b7b8 of 8 bytes by task 0 on cpu 0:
 tick_sched_flag_set kernel/time/tick-sched.c:194 [inline]
 tick_nohz_idle_enter+0x59/0xe0 kernel/time/tick-sched.c:1263
 do_idle+0x3d/0x240 kernel/sched/idle.c:276
 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:428
 rest_init+0xee/0xf0 init/main.c:744
 start_kernel+0x4d7/0x510 init/main.c:1097
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307
 x86_64_start_kernel+0xfc/0x100 arch/x86/kernel/head64.c:288
 common_startup_64+0x13e/0x147

read to 0xffff888237c1b7b8 of 8 bytes by task 22355 on cpu 1:
 print_cpu+0x3f2/0x680 kernel/time/timer_list.c:155
 timer_list_show+0x107/0x170 kernel/time/timer_list.c:295
 seq_read_iter+0x319/0x940 fs/seq_file.c:230
 proc_reg_read_iter+0x10d/0x180 fs/proc/inode.c:299
 io_iter_do_read io_uring/rw.c:828 [inline]
 __io_read+0x435/0xc20 io_uring/rw.c:941
 io_read+0x1c/0x60 io_uring/rw.c:1020
 __io_issue_sqe+0xfe/0x2e0 io_uring/io_uring.c:1773
 io_issue_sqe+0x53/0x970 io_uring/io_uring.c:1796
 io_queue_sqe io_uring/io_uring.c:2025 [inline]
 io_submit_sqe io_uring/io_uring.c:2285 [inline]
 io_submit_sqes+0x675/0x1060 io_uring/io_uring.c:2398
 __do_sys_io_uring_enter io_uring/io_uring.c:3465 [inline]
 __se_sys_io_uring_enter+0x1c1/0x1b70 io_uring/io_uring.c:3399
 __x64_sys_io_uring_enter+0x78/0x90 io_uring/io_uring.c:3399
 x64_sys_call+0x2de1/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000030 -> 0x0000000000000035

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 22355 Comm: syz.5.3886 Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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