================================================================== BUG: KCSAN: data-race in __mod_timer / timer_clear_idle write to 0xffff88813bd1bda5 of 1 bytes by task 0 on cpu 1: timer_clear_idle+0x1e/0x30 kernel/time/timer.c:1699 tick_nohz_restart_sched_tick kernel/time/tick-sched.c:916 [inline] __tick_nohz_idle_restart_tick+0x20/0x180 kernel/time/tick-sched.c:1210 tick_nohz_idle_exit+0x104/0x220 kernel/time/tick-sched.c:1251 do_idle+0x1f6/0x230 kernel/sched/idle.c:312 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:396 secondary_startup_64_no_verify+0xb0/0xbb read to 0xffff88813bd1bda5 of 1 bytes by interrupt on cpu 0: trigger_dyntick_cpu kernel/time/timer.c:568 [inline] enqueue_timer kernel/time/timer.c:599 [inline] __mod_timer+0x8c5/0xc10 kernel/time/timer.c:1058 mod_timer+0x1b/0x20 kernel/time/timer.c:1106 sk_reset_timer+0x1f/0xa0 net/core/sock.c:2946 tcp_send_delayed_ack+0x23e/0x250 net/ipv4/tcp_output.c:3932 __tcp_ack_snd_check+0x2f9/0x510 net/ipv4/tcp_input.c:5426 tcp_rcv_established+0x11f4/0x1480 net/ipv4/tcp_input.c:5855 tcp_v4_do_rcv+0x278/0x4a0 net/ipv4/tcp_ipv4.c:1676 tcp_v4_rcv+0x219f/0x2420 net/ipv4/tcp_ipv4.c:2059 ip_protocol_deliver_rcu+0x1f9/0x3e0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_local_deliver+0x1d6/0x2a0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:447 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:550 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:600 [inline] ip_sublist_rcv+0x4c4/0x590 net/ipv4/ip_input.c:608 ip_list_rcv+0x262/0x290 net/ipv4/ip_input.c:643 __netif_receive_skb_list_ptype net/core/dev.c:5366 [inline] __netif_receive_skb_list_core+0x34b/0x450 net/core/dev.c:5414 __netif_receive_skb_list+0x262/0x2e0 net/core/dev.c:5466 netif_receive_skb_list_internal+0xda/0x330 net/core/dev.c:5576 gro_normal_list net/core/dev.c:5730 [inline] napi_complete_done+0x1b2/0x420 net/core/dev.c:6456 virtqueue_napi_complete+0x28/0x80 drivers/net/virtio_net.c:334 virtnet_poll+0x65f/0x790 drivers/net/virtio_net.c:1460 napi_poll+0x181/0x630 net/core/dev.c:6806 net_rx_action+0x17a/0x490 net/core/dev.c:6889 __do_softirq+0x13c/0x2c3 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x32/0x40 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:226 [inline] __irq_exit_rcu+0xb4/0xc0 kernel/softirq.c:420 common_interrupt+0xb5/0x130 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:620 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:516 [inline] acpi_idle_enter+0x25b/0x2e0 drivers/acpi/processor_idle.c:647 cpuidle_enter_state+0x2b6/0x7c0 drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:351 call_cpuidle kernel/sched/idle.c:158 [inline] cpuidle_idle_call kernel/sched/idle.c:239 [inline] do_idle+0x193/0x230 kernel/sched/idle.c:299 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:396 rest_init+0xd7/0xe0 init/main.c:720 arch_call_rest_init+0xa/0xb start_kernel+0x5a1/0x626 init/main.c:1061 secondary_startup_64_no_verify+0xb0/0xbb Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================