================================================================== BUG: KCSAN: data-race in hrtimer_interrupt / print_cpu write to 0xffff88813bd1de94 of 4 bytes by interrupt on cpu 1: hrtimer_interrupt+0x7a/0xa30 kernel/time/hrtimer.c:1623 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x6f/0x200 arch/x86/kernel/apic/apic.c:1106 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x32/0x50 kernel/locking/spinlock.c:191 percpu_counter_add_batch+0xc8/0x110 lib/percpu_counter.c:93 percpu_counter_add include/linux/percpu_counter.h:56 [inline] percpu_counter_inc include/linux/percpu_counter.h:183 [inline] ext4_es_lookup_extent+0x32c/0x500 fs/ext4/extents_status.c:969 ext4_map_blocks+0x105/0xff0 fs/ext4/inode.c:529 ext4_mpage_readpages+0x6f3/0x15c0 fs/ext4/readpage.c:304 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3261 read_pages+0x9c/0x6e0 mm/readahead.c:130 page_cache_ra_unbounded+0x46c/0x4c0 mm/readahead.c:238 ondemand_readahead+0x560/0x780 mm/readahead.c:267 page_cache_async_ra+0x1aa/0x1d0 mm/readahead.c:607 page_cache_async_readahead include/linux/pagemap.h:862 [inline] generic_file_buffered_read_get_pages+0x42e/0xaf0 mm/filemap.c:2391 generic_file_buffered_read+0x26e/0x9c0 mm/filemap.c:2485 generic_file_read_iter+0x82/0x3e0 mm/filemap.c:2637 ext4_file_read_iter+0x2e0/0x430 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88813bd1de94 of 4 bytes by task 16707 on cpu 0: print_cpu+0x37f/0x690 kernel/time/timer_list.c:135 timer_list_show+0x114/0x180 kernel/time/timer_list.c:283 seq_read_iter+0x60b/0x910 fs/seq_file.c:269 proc_reg_read_iter+0xfc/0x170 fs/proc/inode.c:310 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 16707 Comm: syz-executor.3 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================