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BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu

write to 0xffff888237d197e0 of 8 bytes by interrupt on cpu 1:
 hrtimer_interrupt+0x1fb/0xaf0 kernel/time/hrtimer.c:1803
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x6f/0x1c0 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x64/0x80 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 __sanitizer_cov_trace_const_cmp8+0x0/0x90 kernel/kcov.c:286
 _compound_head include/linux/page-flags.h:187 [inline]
 PageSwapBacked include/linux/page-flags.h:360 [inline]
 mm_counter_file include/linux/mm.h:1951 [inline]
 mm_counter include/linux/mm.h:1960 [inline]
 zap_pte_range+0x65d/0xe00 mm/memory.c:1361
 zap_pmd_range mm/memory.c:1481 [inline]
 zap_pud_range mm/memory.c:1510 [inline]
 zap_p4d_range mm/memory.c:1531 [inline]
 unmap_page_range+0x2dc/0x3d0 mm/memory.c:1552
 unmap_single_vma+0x157/0x210 mm/memory.c:1597
 unmap_vmas+0xc0/0x170 mm/memory.c:1629
 exit_mmap+0x22d/0x460 mm/mmap.c:3171
 __mmput+0x27/0x1d0 kernel/fork.c:1114
 mmput+0x3d/0x50 kernel/fork.c:1135
 exit_mm+0x2f7/0x3f0 kernel/exit.c:501
 do_exit+0x3ef/0x14a0 kernel/exit.c:812
 do_group_exit+0xce/0x1a0 kernel/exit.c:922
 get_signal+0xfa3/0x15e0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888237d197e0 of 8 bytes by task 14320 on cpu 0:
 print_cpu+0x32e/0x690 kernel/time/timer_list.c:133
 timer_list_show+0x114/0x180 kernel/time/timer_list.c:291
 seq_read_iter+0x60b/0x930 fs/seq_file.c:272
 proc_reg_read_iter+0xfc/0x170 fs/proc/inode.c:300
 call_read_iter include/linux/fs.h:2157 [inline]
 do_iter_readv_writev+0x2ea/0x370 fs/read_write.c:727
 do_iter_read+0x192/0x5d0 fs/read_write.c:790
 vfs_readv fs/read_write.c:910 [inline]
 do_preadv+0x13b/0x230 fs/read_write.c:1002
 __do_sys_preadv fs/read_write.c:1052 [inline]
 __se_sys_preadv fs/read_write.c:1047 [inline]
 __x64_sys_preadv+0x54/0x60 fs/read_write.c:1047
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000001db2a49669c -> 0x000001db2a4c945e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 14320 Comm: syz-executor.1 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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