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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

read to 0xffff88812c01fd38 of 8 bytes by task 11125 on cpu 1:
 print_base kernel/time/timer_list.c:124 [inline]
 print_cpu+0x10f/0x650 kernel/time/timer_list.c:138
 timer_list_show+0xbb/0x140 kernel/time/timer_list.c:311
 seq_read+0x350/0x9d0 fs/seq_file.c:229
 proc_reg_read+0xe9/0x140 fs/proc/inode.c:223
 __vfs_read+0x67/0xc0 fs/read_write.c:425
 vfs_read fs/read_write.c:461 [inline]
 vfs_read+0x143/0x2c0 fs/read_write.c:446
 ksys_pread64+0xee/0x120 fs/read_write.c:639
 __do_sys_pread64 fs/read_write.c:649 [inline]
 __se_sys_pread64 fs/read_write.c:646 [inline]
 __x64_sys_pread64+0x5e/0x80 fs/read_write.c:646
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff88812c01fd38 of 8 bytes by interrupt on cpu 0:
 hrtimer_update_base kernel/time/hrtimer.c:601 [inline]
 hrtimer_interrupt+0x116/0x480 kernel/time/hrtimer.c:1623
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0xdc/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 __read_once_size include/linux/compiler.h:232 [inline]
 arch_atomic64_read arch/x86/include/asm/atomic64_64.h:22 [inline]
 atomic64_read include/asm-generic/atomic-instrumented.h:851 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:29 [inline]
 find_watchpoint kernel/kcsan/core.c:96 [inline]
 check_access kernel/kcsan/core.c:446 [inline]
 __tsan_read8+0x34/0x100 kernel/kcsan/core.c:589
 inet_twsk_purge+0xa2/0x390 net/ipv4/inet_timewait_sock.c:270
 dccp_v4_exit_batch+0x23/0x30 net/dccp/ipv4.c:1030
 ops_exit_list.isra.0+0xa2/0xc0 net/core/net_namespace.c:175
 cleanup_net+0x405/0x6b0 net/core/net_namespace.c:597
 process_one_work+0x3d4/0x890 kernel/workqueue.c:2264
 worker_thread+0xa0/0x800 kernel/workqueue.c:2410
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 590 Comm: kworker/u4:4 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
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