================================================================== BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: 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 arch_local_irq_enable arch/x86/include/asm/paravirt.h:769 [inline] tick_nohz_idle_exit+0x128/0x1d0 kernel/time/tick-sched.c:1204 do_idle+0xac/0x290 kernel/sched/idle.c:282 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 start_secondary+0x169/0x1b0 arch/x86/kernel/smpboot.c:268 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: 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 get_current arch/x86/include/asm/current.h:15 [inline] __sanitizer_cov_trace_pc+0x9/0x50 kernel/kcov.c:186 inet_sdif include/net/ip.h:104 [inline] tcp_v4_rcv+0x4a/0x1e10 net/ipv4/tcp_ipv4.c:1869 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 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================