================================================================== BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0 write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: timer_clear_idle+0x3d/0x50 kernel/time/timer.c:1676 tick_nohz_restart_sched_tick kernel/time/tick-sched.c:860 [inline] __tick_nohz_idle_restart_tick+0x32/0x1a0 kernel/time/tick-sched.c:1161 tick_nohz_idle_exit+0x19c/0x1d0 kernel/time/tick-sched.c:1202 do_idle+0xac/0x290 kernel/sched/idle.c:282 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 rest_init+0xe4/0xeb init/main.c:667 arch_call_rest_init+0x13/0x2b start_kernel+0x7fe/0x823 init/main.c:1005 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 read to 0xffff88812c01dca4 of 1 bytes by interrupt on cpu 1: trigger_dyntick_cpu.isra.0+0x6d/0xf0 kernel/time/timer.c:577 internal_add_timer kernel/time/timer.c:596 [inline] __mod_timer kernel/time/timer.c:1054 [inline] mod_timer+0x3d7/0x830 kernel/time/timer.c:1101 sk_reset_timer+0x29/0xc0 net/core/sock.c:2863 tcp_send_delayed_ack+0x1fd/0x280 net/ipv4/tcp_output.c:3742 __tcp_ack_snd_check+0x3bb/0x550 net/ipv4/tcp_input.c:5268 tcp_ack_snd_check net/ipv4/tcp_input.c:5309 [inline] tcp_rcv_established+0x72b/0xee0 net/ipv4/tcp_input.c:5730 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:6269 [inline] napi_complete_done+0x1d3/0x3a0 net/core/dev.c:6257 virtqueue_napi_complete+0x36/0xa0 drivers/net/virtio_net.c:329 virtnet_poll+0x771/0x790 drivers/net/virtio_net.c:1444 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 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0xb5/0xd0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] do_IRQ+0x7b/0x120 arch/x86/kernel/irq.c:263 ret_from_intr+0x0/0x21 native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60 arch_safe_halt arch/x86/include/asm/paravirt.h:144 [inline] default_idle+0x21/0x170 arch/x86/kernel/process.c:697 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1b7/0x290 kernel/sched/idle.c:269 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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================