================================================================== BUG: KCSAN: data-race in internal_add_timer / timer_clear_idle write to 0xffff888237c1ba65 of 1 bytes by task 0 on cpu 0: timer_clear_idle+0x2e/0x40 kernel/time/timer.c:1755 tick_nohz_restart_sched_tick+0x20/0x110 kernel/time/tick-sched.c:968 tick_nohz_idle_update_tick kernel/time/tick-sched.c:1315 [inline] tick_nohz_idle_exit+0x119/0x280 kernel/time/tick-sched.c:1349 do_idle+0x215/0x250 kernel/sched/idle.c:316 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400 rest_init+0xe8/0xf0 init/main.c:727 start_kernel+0x0/0x656 init/main.c:883 start_kernel+0x5d1/0x656 init/main.c:1138 secondary_startup_64_no_verify+0xcf/0xdb read to 0xffff888237c1ba65 of 1 bytes by interrupt on cpu 1: trigger_dyntick_cpu kernel/time/timer.c:592 [inline] enqueue_timer kernel/time/timer.c:624 [inline] internal_add_timer+0x22e/0x2b0 kernel/time/timer.c:634 __mod_timer+0x7b8/0xc40 kernel/time/timer.c:1115 mod_timer+0x1b/0x20 kernel/time/timer.c:1161 sk_reset_timer+0x1f/0xa0 net/core/sock.c:3287 tcp_send_delayed_ack+0x239/0x250 net/ipv4/tcp_output.c:3939 __tcp_ack_snd_check+0x2f6/0x500 net/ipv4/tcp_input.c:5528 tcp_ack_snd_check net/ipv4/tcp_input.c:5569 [inline] tcp_rcv_established+0x719/0xea0 net/ipv4/tcp_input.c:6007 tcp_v4_do_rcv+0x2a8/0x5a0 net/ipv4/tcp_ipv4.c:1661 tcp_v4_rcv+0x17c8/0x1a30 net/ipv4/tcp_ipv4.c:2078 ip_protocol_deliver_rcu+0x23f/0x490 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x126/0x160 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x100/0x1b0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:575 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:625 [inline] ip_sublist_rcv+0x524/0x5f0 net/ipv4/ip_input.c:633 ip_list_rcv+0x277/0x2b0 net/ipv4/ip_input.c:668 __netif_receive_skb_list_ptype net/core/dev.c:5528 [inline] __netif_receive_skb_list_core+0x37d/0x490 net/core/dev.c:5576 __netif_receive_skb_list+0x2a2/0x320 net/core/dev.c:5628 netif_receive_skb_list_internal+0x254/0x390 net/core/dev.c:5719 gro_normal_list include/net/gro.h:430 [inline] napi_complete_done+0x1b2/0x3c0 net/core/dev.c:6060 virtqueue_napi_complete drivers/net/virtio_net.c:398 [inline] virtnet_poll+0x6e4/0x990 drivers/net/virtio_net.c:1675 __napi_poll+0x65/0x390 net/core/dev.c:6511 napi_poll net/core/dev.c:6578 [inline] net_rx_action+0x37e/0x730 net/core/dev.c:6689 __do_softirq+0x158/0x2e3 kernel/softirq.c:571 __irq_exit_rcu kernel/softirq.c:650 [inline] irq_exit_rcu+0x41/0x70 kernel/softirq.c:662 common_interrupt+0x9f/0xc0 arch/x86/kernel/irq.c:240 asm_common_interrupt+0x22/0x40 arch/x86/include/asm/idtentry.h:640 native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] acpi_safe_halt drivers/acpi/processor_idle.c:112 [inline] acpi_idle_do_entry drivers/acpi/processor_idle.c:572 [inline] acpi_idle_enter+0x283/0x340 drivers/acpi/processor_idle.c:709 cpuidle_enter_state+0x2de/0x960 drivers/cpuidle/cpuidle.c:239 cpuidle_enter+0x3c/0x60 drivers/cpuidle/cpuidle.c:356 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:236 [inline] do_idle+0x1a7/0x250 kernel/sched/idle.c:303 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:400 start_secondary+0x78/0x80 arch/x86/kernel/smpboot.c:262 secondary_startup_64_no_verify+0xcf/0xdb value changed: 0x01 -> 0x00 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.0.0-rc7-syzkaller-00081-gc3e0e1e23c70-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 ==================================================================