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

read-write to 0xffff888237c1f3d4 of 4 bytes by interrupt on cpu 0:
 hrtimer_interrupt+0x6f/0x7b0 kernel/time/hrtimer.c:1792
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
 __sysvec_apic_timer_interrupt+0x52/0x190 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x68/0x80 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
 check_kcov_mode kernel/kcov.c:173 [inline]
 __sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:207
 get_next_corpse net/netfilter/nf_conntrack_core.c:2355 [inline]
 nf_ct_iterate_cleanup+0x1e3/0x3e0 net/netfilter/nf_conntrack_core.c:2406
 nf_ct_iterate_cleanup_net+0x8a/0xa0 net/netfilter/nf_conntrack_core.c:2427
 iterate_cleanup_work+0x66/0x120 net/netfilter/nf_nat_masquerade.c:87
 process_one_work kernel/workqueue.c:2633 [inline]
 process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706
 worker_thread+0x525/0x730 kernel/workqueue.c:2787
 kthread+0x1d7/0x210 kernel/kthread.c:388
 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

read to 0xffff888237c1f3d4 of 4 bytes by task 3628 on cpu 1:
 print_cpu+0x348/0x640 kernel/time/timer_list.c:135
 timer_list_show+0x115/0x180 kernel/time/timer_list.c:291
 traverse+0x142/0x3a0 fs/seq_file.c:111
 seq_read_iter+0x804/0x8f0 fs/seq_file.c:195
 proc_reg_read_iter+0x114/0x180 fs/proc/inode.c:302
 vfs_readv+0x450/0x6a0 fs/read_write.c:932
 do_preadv fs/read_write.c:1049 [inline]
 __do_sys_preadv fs/read_write.c:1099 [inline]
 __se_sys_preadv fs/read_write.c:1094 [inline]
 __x64_sys_preadv+0x100/0x1c0 fs/read_write.c:1094
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x0017b6f3 -> 0x0017b6f4

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3628 Comm: syz-executor.3 Not tainted 6.7.0-syzkaller-01727-gab27740f7665 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
==================================================================