BUG: KCSAN: data-race in hrtimer_interrupt / print_tickdevice

write to 0xffff888237d1af18 of 8 bytes by interrupt on cpu 1:
 hrtimer_interrupt+0xb3/0xac0 kernel/time/hrtimer.c:1790
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xa3/0x240 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x88/0xb0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 kcsan_setup_watchpoint+0x43d/0x460 kernel/kcsan/core.c:694
 kernfs_name_hash fs/kernfs/dir.c:303 [inline]
 kernfs_find_ns+0x158/0x320 fs/kernfs/dir.c:800
 kernfs_remove_by_name_ns+0x57/0xb0 fs/kernfs/dir.c:1563
 kernfs_remove_by_name include/linux/kernfs.h:574 [inline]
 sysfs_unmerge_group+0x79/0xc0 fs/sysfs/group.c:368
 dpm_sysfs_remove+0x65/0x80 drivers/base/power/sysfs.c:836
 device_del+0x179/0x8c0 drivers/base/core.c:3569
 netdev_unregister_kobject+0x11c/0x130 net/core/net-sysfs.c:1974
 unregister_netdevice_many+0xbc0/0xfb0 net/core/dev.c:10442
 ip_tunnel_delete_nets+0x25a/0x290 net/ipv4/ip_tunnel.c:1123
 erspan_exit_batch_net+0x2a/0x30 net/ipv4/ip_gre.c:1709
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x4dc/0x8d0 net/core/net_namespace.c:597
 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307
 worker_thread+0x616/0xa70 kernel/workqueue.c:2454
 kthread+0x1bf/0x1e0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

read to 0xffff888237d1af18 of 8 bytes by task 6753 on cpu 0:
 print_tickdevice+0x158/0x370 kernel/time/timer_list.c:204
 timer_list_show+0x74/0x180 kernel/time/timer_list.c:296
 seq_read_iter+0x2e1/0x930 fs/seq_file.c:230
 proc_reg_read_iter+0xfc/0x170 fs/proc/inode.c:300
 call_read_iter include/linux/fs.h:2068 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000001ce2a59806 -> 0x0000001ce2aa2e0c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6753 Comm: syz-executor.4 Not tainted 5.17.0-rc4-syzkaller-00241-g7f25f0412c9e-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================