================================================================== BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: tick_sched_do_timer+0xb4/0xd0 kernel/time/tick-sched.c:141 tick_sched_timer+0x3f/0xd0 kernel/time/tick-sched.c:1313 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 __write_once_size include/linux/compiler.h:250 [inline] write_comp_data+0x68/0x70 kernel/kcov.c:230 __sanitizer_cov_trace_switch+0x45/0x70 kernel/kcov.c:310 __read_once_size+0x20/0xd0 include/linux/compiler.h:232 tk_clock_read kernel/time/timekeeping.c:171 [inline] timekeeping_get_delta kernel/time/timekeeping.c:267 [inline] timekeeping_get_ns kernel/time/timekeeping.c:374 [inline] ktime_get+0x91/0x210 kernel/time/timekeeping.c:759 ktime_get_ns include/linux/timekeeping.h:154 [inline] tcp_clock_ns include/net/tcp.h:762 [inline] tcp_mstamp_refresh+0x19/0x70 net/ipv4/tcp_output.c:55 tcp_rcv_established+0x81/0xee0 net/ipv4/tcp_input.c:5573 tcp_v4_do_rcv+0x396/0x4f0 net/ipv4/tcp_ipv4.c:1621 tcp_v4_rcv+0x1c55/0x1e10 net/ipv4/tcp_ipv4.c:2003 ip_protocol_deliver_rcu+0x4b/0x410 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0xf3/0x120 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_local_deliver+0x135/0x220 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:441 [inline] ip_sublist_rcv_finish+0xf0/0x140 net/ipv4/ip_input.c:550 ip_list_rcv_finish net/ipv4/ip_input.c:600 [inline] ip_sublist_rcv+0x3f8/0x530 net/ipv4/ip_input.c:608 ip_list_rcv+0x2f3/0x321 net/ipv4/ip_input.c:643 __netif_receive_skb_list_ptype net/core/dev.c:5230 [inline] __netif_receive_skb_list_ptype net/core/dev.c:5219 [inline] __netif_receive_skb_list_core+0x368/0x5c0 net/core/dev.c:5278 __netif_receive_skb_list net/core/dev.c:5330 [inline] netif_receive_skb_list_internal+0x5c7/0x810 net/core/dev.c:5425 gro_normal_list.part.0+0x37/0xa0 net/core/dev.c:5536 gro_normal_list net/core/dev.c:5549 [inline] gro_normal_one+0x14c/0x160 net/core/dev.c:5548 napi_skb_finish net/core/dev.c:5876 [inline] napi_gro_receive+0x27d/0x2f0 net/core/dev.c:5908 receive_buf+0x24c/0x3420 drivers/net/virtio_net.c:1073 virtnet_receive drivers/net/virtio_net.c:1335 [inline] virtnet_poll+0x343/0x790 drivers/net/virtio_net.c:1440 napi_poll net/core/dev.c:6571 [inline] net_rx_action+0x3ad/0xac0 net/core/dev.c:6639 __do_softirq+0x118/0x34a kernel/softirq.c:292 run_ksoftirqd+0x41/0x60 kernel/softirq.c:604 smpboot_thread_fn+0x374/0x4a0 kernel/smpboot.c:165 kthread+0x203/0x230 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: tick_sched_do_timer+0x2e/0xd0 kernel/time/tick-sched.c:137 tick_sched_timer+0x3f/0xd0 kernel/time/tick-sched.c:1313 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x271/0x600 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x226/0x490 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0xd8/0x270 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 should_fail+0x1cf/0x2fd lib/fault-inject.c:149 should_fail_futex kernel/futex.c:296 [inline] get_futex_key+0x5e1/0xbe0 kernel/futex.c:520 futex_wait_setup+0x6f/0x1c0 kernel/futex.c:2678 futex_wait+0x14a/0x3a0 kernel/futex.c:2732 do_futex+0xe2/0x15b0 kernel/futex.c:3808 __do_sys_futex kernel/futex.c:3869 [inline] __se_sys_futex kernel/futex.c:3837 [inline] __x64_sys_futex+0x2dc/0x410 kernel/futex.c:3837 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8892 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================