================================================================== BUG: KCSAN: data-race in acct_account_cputime / mmap_region write to 0xffff88809666d2c0 of 8 bytes by task 10958 on cpu 0: vm_stat_account mm/mmap.c:3347 [inline] mmap_region+0x5ef/0x1490 mm/mmap.c:1828 do_mmap+0x77d/0xc90 mm/mmap.c:1545 vm_mmap_pgoff+0xe5/0x170 mm/util.c:506 ksys_mmap_pgoff+0xe1/0x380 mm/mmap.c:1596 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88809666d2c0 of 8 bytes by interrupt on cpu 1: __acct_update_integrals kernel/tsacct.c:140 [inline] acct_account_cputime+0x15a/0x1a0 kernel/tsacct.c:164 update_process_times+0x1f/0x140 kernel/time/timer.c:1708 tick_sched_handle kernel/time/tick-sched.c:176 [inline] tick_sched_timer+0x1a2/0x230 kernel/time/tick-sched.c:1328 __run_hrtimer+0x154/0x4b0 kernel/time/hrtimer.c:1524 __hrtimer_run_queues kernel/time/hrtimer.c:1588 [inline] hrtimer_interrupt+0x37c/0xa40 kernel/time/hrtimer.c:1650 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0xa3/0x280 arch/x86/kernel/apic/apic.c:1097 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] sysvec_apic_timer_interrupt+0x80/0xd0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 console_unlock+0x8ed/0xab0 arch/x86/include/asm/paravirt.h:770 vprintk_emit+0x37f/0x4f0 kernel/printk/printk.c:2029 vprintk_default+0x24/0x30 kernel/printk/printk.c:2047 vprintk_func+0x13d/0x140 kernel/printk/printk_safe.c:393 printk+0x62/0x82 kernel/printk/printk.c:2078 fat_msg+0x80/0xaf fs/fat/misc.c:56 fat_fill_super+0x2898/0x2a90 fs/fat/inode.c:1891 msdos_fill_super+0x29/0x30 fs/fat/namei_msdos.c:653 mount_bdev+0x1e8/0x290 fs/super.c:1417 msdos_mount+0x2d/0x40 fs/fat/namei_msdos.c:660 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592 vfs_get_tree+0x4d/0x1a0 fs/super.c:1547 do_new_mount fs/namespace.c:2875 [inline] path_mount+0x118d/0x1c70 fs/namespace.c:3192 do_mount fs/namespace.c:3205 [inline] __do_sys_mount fs/namespace.c:3413 [inline] __se_sys_mount+0x126/0x180 fs/namespace.c:3390 __x64_sys_mount+0x63/0x70 fs/namespace.c:3390 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: 1 PID: 10969 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================