==================================================================
BUG: KCSAN: data-race in print_cpu / tick_nohz_idle_enter

write to 0xffff888237c1b830 of 8 bytes by task 0 on cpu 0:
 tick_nohz_start_idle kernel/time/tick-sched.c:748 [inline]
 tick_nohz_idle_enter+0x89/0xe0 kernel/time/tick-sched.c:1264
 do_idle+0x3d/0x240 kernel/sched/idle.c:271
 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:423
 rest_init+0xee/0xf0 init/main.c:745
 start_kernel+0x592/0x600 init/main.c:1102
 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 0xffff888237c1b830 of 8 bytes by task 7960 on cpu 1:
 print_cpu+0x502/0x680 kernel/time/timer_list.c:162
 timer_list_show+0x107/0x170 kernel/time/timer_list.c:295
 seq_read_iter+0x62a/0x940 fs/seq_file.c:272
 proc_reg_read_iter+0x110/0x180 fs/proc/inode.c:299
 copy_splice_read+0x3c4/0x5f0 fs/splice.c:363
 do_splice_read fs/splice.c:979 [inline]
 splice_direct_to_actor+0x26f/0x680 fs/splice.c:1083
 do_splice_direct_actor fs/splice.c:1201 [inline]
 do_splice_direct+0xda/0x150 fs/splice.c:1227
 do_sendfile+0x380/0x650 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64 fs/read_write.c:1417 [inline]
 __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1417
 x64_sys_call+0xb39/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:41
 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: 0x00000016750281ff -> 0x00000016750427fd

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7960 Comm: syz.0.1687 Not tainted 6.16.0-syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
==================================================================