syzbot

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BUG: KCSAN: data-race in print_cpu / tick_nohz_idle_enter

write to 0xffff888237c1bf28 of 8 bytes by task 0 on cpu 0:
 tick_nohz_start_idle kernel/time/tick-sched.c:779 [inline]
 tick_nohz_idle_enter+0x92/0xf0 kernel/time/tick-sched.c:1307
 do_idle+0x3b/0x2b0 kernel/sched/idle.c:298
 cpu_startup_entry+0x24/0x30 kernel/sched/idle.c:451
 rest_init+0xee/0xf0 init/main.c:762
 start_kernel+0x49f/0x4d0 init/main.c:1220
 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
 x86_64_start_kernel+0xfc/0x100 arch/x86/kernel/head64.c:291
 common_startup_64+0x13e/0x147

read to 0xffff888237c1bf28 of 8 bytes by task 9982 on cpu 1:
 print_cpu+0x4ef/0x670 kernel/time/timer_list.c:158
 timer_list_show+0x107/0x170 kernel/time/timer_list.c:291
 seq_read_iter+0x636/0x940 fs/seq_file.c:273
 proc_reg_read_iter+0x110/0x180 fs/proc/inode.c:299
 copy_splice_read+0x471/0x6c0 fs/splice.c:362
 do_splice_read fs/splice.c:980 [inline]
 splice_direct_to_actor+0x26e/0x670 fs/splice.c:1084
 do_splice_direct_actor fs/splice.c:1202 [inline]
 do_splice_direct+0x119/0x1a0 fs/splice.c:1228
 do_sendfile+0x382/0x650 fs/read_write.c:1372
 __do_sys_sendfile64 fs/read_write.c:1433 [inline]
 __se_sys_sendfile64 fs/read_write.c:1419 [inline]
 __x64_sys_sendfile64+0x105/0x150 fs/read_write.c:1419
 x64_sys_call+0x2dc4/0x3020 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000006517af19da -> 0x0000006517b10e84

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 9982 Comm: syz.0.1858 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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