syzbot

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BUG: KCSAN: data-race in print_cpu / tick_nohz_idle_enter

write to 0xffff888237c1f368 of 8 bytes by task 0 on cpu 0:
 tick_nohz_start_idle kernel/time/tick-sched.c:686 [inline]
 tick_nohz_idle_enter+0x85/0xd0 kernel/time/tick-sched.c:1172
 do_idle+0x3c/0x230 kernel/sched/idle.c:256
 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379
 rest_init+0xf3/0x100 init/main.c:726
 arch_call_rest_init+0x9/0x10 init/main.c:823
 start_kernel+0x57d/0x5d0 init/main.c:1068
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:556
 x86_64_start_kernel+0x94/0xa0 arch/x86/kernel/head64.c:537
 secondary_startup_64_no_verify+0x167/0x16b

read to 0xffff888237c1f368 of 8 bytes by task 4847 on cpu 1:
 print_cpu+0x4c4/0x640 kernel/time/timer_list.c:158
 timer_list_show+0x115/0x180 kernel/time/timer_list.c:291
 seq_read_iter+0x612/0x8f0 fs/seq_file.c:272
 proc_reg_read_iter+0x114/0x180 fs/proc/inode.c:305
 call_read_iter include/linux/fs.h:1979 [inline]
 copy_splice_read+0x26b/0x4b0 fs/splice.c:364
 vfs_splice_read fs/splice.c:993 [inline]
 splice_direct_to_actor+0x28c/0x690 fs/splice.c:1069
 do_splice_direct+0x10d/0x190 fs/splice.c:1194
 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 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: 0x0000001c1e119f04 -> 0x0000001c1e149543

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4847 Comm: syz-executor.4 Not tainted 6.5.0-syzkaller-08894-gb97d64c72259 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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