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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

read-write to 0xffff888237c1f0d4 of 4 bytes by interrupt on cpu 0:
 hrtimer_interrupt+0x6f/0x7b0 kernel/time/hrtimer.c:1793
 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+0x6a/0x80 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
 kcsan_setup_watchpoint+0x3fe/0x410 kernel/kcsan/core.c:705
 skb_is_nonlinear include/linux/skbuff.h:2410 [inline]
 skb_tailroom include/linux/skbuff.h:2724 [inline]
 nla_reserve+0x24/0xe0 lib/nlattr.c:965
 inet6_fill_ifla6_attrs+0x196/0xdc0 net/ipv6/addrconf.c:5751
 inet6_fill_link_af+0x41/0x70 net/ipv6/addrconf.c:5808
 rtnl_fill_link_af+0x144/0x280 net/core/rtnetlink.c:1677
 rtnl_fill_ifinfo+0xf87/0x1140 net/core/rtnetlink.c:1929
 rtmsg_ifinfo_build_skb+0x129/0x1b0 net/core/rtnetlink.c:4081
 rtmsg_ifinfo_event net/core/rtnetlink.c:4115 [inline]
 rtnetlink_event+0x180/0x1f0 net/core/rtnetlink.c:6669
 notifier_call_chain kernel/notifier.c:93 [inline]
 raw_notifier_call_chain+0x6b/0x1c0 kernel/notifier.c:461
 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:1966
 __netdev_upper_dev_unlink+0x194/0x7f0 net/core/dev.c:7855
 netdev_upper_dev_unlink+0x32/0x50 net/core/dev.c:7882
 unregister_vlan_dev+0x1fe/0x2b0 net/8021q/vlan.c:113
 rtnl_newlink_create net/core/rtnetlink.c:3548 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3738 [inline]
 rtnl_newlink+0x13e8/0x1670 net/core/rtnetlink.c:3751
 rtnetlink_rcv_msg+0x80a/0x8c0 net/core/rtnetlink.c:6618
 netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2543
 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6636
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x589/0x660 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x37c/0x4d0 net/socket.c:2584
 ___sys_sendmsg net/socket.c:2638 [inline]
 __sys_sendmsg+0x1e9/0x270 net/socket.c:2667
 __do_sys_sendmsg net/socket.c:2676 [inline]
 __se_sys_sendmsg net/socket.c:2674 [inline]
 __x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888237c1f0d4 of 4 bytes by task 19423 on cpu 1:
 print_cpu+0x348/0x640 kernel/time/timer_list.c:135
 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:299
 call_read_iter include/linux/fs.h:2081 [inline]
 copy_splice_read+0x39f/0x5d0 fs/splice.c:365
 do_splice_read fs/splice.c:985 [inline]
 splice_direct_to_actor+0x268/0x660 fs/splice.c:1089
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0xd7/0x150 fs/splice.c:1233
 do_sendfile+0x3b9/0x960 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x000e2253 -> 0x000e2254

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19423 Comm: syz-executor.2 Not tainted 6.8.0-rc6-syzkaller-00021-gcf1182944c7c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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