================================================================== 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 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/timer.c:1699 tick_nohz_restart_sched_tick syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/tick-sched.c:916 [inline] __tick_nohz_idle_restart_tick+0x20/0x180 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/tick-sched.c:1210 tick_nohz_idle_exit+0x104/0x220 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/tick-sched.c:1251 do_idle+0x1f6/0x230 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/sched/idle.c:312 cpu_startup_entry+0x15/0x20 syzkaller/managers/upstream-kcsan-gce/kernel/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 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/timer.c:568 [inline] enqueue_timer syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/timer.c:599 [inline] __mod_timer+0x8c5/0xc10 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/timer.c:1058 mod_timer+0x1b/0x20 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/time/timer.c:1106 sk_reset_timer+0x1f/0xa0 syzkaller/managers/upstream-kcsan-gce/kernel/net/core/sock.c:2946 tcp_send_delayed_ack+0x23e/0x250 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/tcp_output.c:3932 __tcp_ack_snd_check+0x2f9/0x510 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/tcp_input.c:5426 tcp_ack_snd_check syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/tcp_input.c:5466 [inline] tcp_rcv_established+0x9c8/0x1480 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/tcp_input.c:5891 tcp_v4_do_rcv+0x278/0x4a0 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/tcp_ipv4.c:1676 tcp_v4_rcv+0x219f/0x2420 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/tcp_ipv4.c:2059 ip_protocol_deliver_rcu+0x1f9/0x3e0 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/ip_input.c:204 ip_local_deliver_finish syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/ip_input.c:231 [inline] NF_HOOK syzkaller/managers/upstream-kcsan-gce/kernel/./include/linux/netfilter.h:301 [inline] ip_local_deliver+0x1d6/0x2a0 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/ip_input.c:252 dst_input syzkaller/managers/upstream-kcsan-gce/kernel/./include/net/dst.h:447 [inline] ip_sublist_rcv_finish syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/ip_input.c:550 [inline] ip_list_rcv_finish syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/ip_input.c:600 [inline] ip_sublist_rcv+0x4c4/0x590 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/ip_input.c:608 ip_list_rcv+0x262/0x290 syzkaller/managers/upstream-kcsan-gce/kernel/net/ipv4/ip_input.c:643 __netif_receive_skb_list_ptype syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:5366 [inline] __netif_receive_skb_list_core+0x34b/0x450 syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:5414 __netif_receive_skb_list+0x262/0x2e0 syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:5466 netif_receive_skb_list_internal+0xda/0x330 syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:5576 gro_normal_list syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:5730 [inline] gro_normal_one syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:5742 [inline] napi_skb_finish syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:6070 [inline] napi_gro_receive+0x361/0x580 syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:6102 receive_buf+0x7a7/0xd20 syzkaller/managers/upstream-kcsan-gce/kernel/drivers/net/virtio_net.c:1087 virtnet_receive syzkaller/managers/upstream-kcsan-gce/kernel/drivers/net/virtio_net.c:1351 [inline] virtnet_poll+0x30a/0x790 syzkaller/managers/upstream-kcsan-gce/kernel/drivers/net/virtio_net.c:1456 napi_poll+0x181/0x630 syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:6805 net_rx_action+0x17a/0x490 syzkaller/managers/upstream-kcsan-gce/kernel/net/core/dev.c:6888 __do_softirq+0x13c/0x2c3 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack syzkaller/managers/upstream-kcsan-gce/kernel/./arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond syzkaller/managers/upstream-kcsan-gce/kernel/./arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x32/0x40 syzkaller/managers/upstream-kcsan-gce/kernel/arch/x86/kernel/irq_64.c:77 invoke_softirq syzkaller/managers/upstream-kcsan-gce/kernel/kernel/softirq.c:226 [inline] __irq_exit_rcu+0xb4/0xc0 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/softirq.c:420 common_interrupt+0xb5/0x130 syzkaller/managers/upstream-kcsan-gce/kernel/arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 syzkaller/managers/upstream-kcsan-gce/kernel/./arch/x86/include/asm/idtentry.h:620 native_safe_halt syzkaller/managers/upstream-kcsan-gce/kernel/./arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt syzkaller/managers/upstream-kcsan-gce/kernel/./arch/x86/include/asm/irqflags.h:103 [inline] acpi_safe_halt syzkaller/managers/upstream-kcsan-gce/kernel/drivers/acpi/processor_idle.c:110 [inline] acpi_idle_do_entry syzkaller/managers/upstream-kcsan-gce/kernel/drivers/acpi/processor_idle.c:516 [inline] acpi_idle_enter+0x25b/0x2e0 syzkaller/managers/upstream-kcsan-gce/kernel/drivers/acpi/processor_idle.c:647 cpuidle_enter_state+0x2b6/0x7c0 syzkaller/managers/upstream-kcsan-gce/kernel/drivers/cpuidle/cpuidle.c:237 cpuidle_enter+0x3c/0x60 syzkaller/managers/upstream-kcsan-gce/kernel/drivers/cpuidle/cpuidle.c:351 call_cpuidle syzkaller/managers/upstream-kcsan-gce/kernel/kernel/sched/idle.c:158 [inline] cpuidle_idle_call syzkaller/managers/upstream-kcsan-gce/kernel/kernel/sched/idle.c:239 [inline] do_idle+0x193/0x230 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/sched/idle.c:299 cpu_startup_entry+0x15/0x20 syzkaller/managers/upstream-kcsan-gce/kernel/kernel/sched/idle.c:396 rest_init+0xd7/0xe0 syzkaller/managers/upstream-kcsan-gce/kernel/init/main.c:720 arch_call_rest_init+0xa/0xb start_kernel+0x5a1/0x626 syzkaller/managers/upstream-kcsan-gce/kernel/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-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================