================================================================== BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu write to 0xffff88812c01fca0 of 8 bytes by interrupt on cpu 0: hrtimer_interrupt+0x1bc/0x480 kernel/time/hrtimer.c:1633 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] check_kcov_mode kernel/kcov.c:155 [inline] write_comp_data+0x1e/0x70 kernel/kcov.c:208 __read_once_size+0x25/0xe0 include/linux/compiler.h:232 compound_head include/linux/page-flags.h:174 [inline] PageSwapBacked include/linux/page-flags.h:340 [inline] mm_counter_file include/linux/mm.h:1657 [inline] mm_counter include/linux/mm.h:1666 [inline] zap_pte_range mm/memory.c:1079 [inline] zap_pmd_range mm/memory.c:1184 [inline] zap_pud_range mm/memory.c:1213 [inline] zap_p4d_range mm/memory.c:1234 [inline] unmap_page_range+0xba7/0x1b20 mm/memory.c:1255 unmap_single_vma+0x144/0x200 mm/memory.c:1300 unmap_vmas+0xda/0x1a0 mm/memory.c:1332 exit_mmap+0x13e/0x300 mm/mmap.c:3140 __mmput kernel/fork.c:1082 [inline] mmput+0xea/0x280 kernel/fork.c:1103 exit_mm kernel/exit.c:485 [inline] do_exit+0x4ac/0x18c0 kernel/exit.c:784 do_group_exit+0xb4/0x1c0 kernel/exit.c:895 get_signal+0x2a2/0x1320 kernel/signal.c:2734 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:815 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812c01fca0 of 8 bytes by task 32253 on cpu 1: print_cpu+0x221/0x650 kernel/time/timer_list.c:148 timer_list_show+0xbb/0x140 kernel/time/timer_list.c:311 seq_read+0x7bb/0x9d0 fs/seq_file.c:268 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_read+0xd5/0x1b0 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x4c/0x60 fs/read_write.c:595 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 32253 Comm: syz-executor.5 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================