INFO: rcu_preempt self-detected stall on CPU 1-...: (10500 ticks this GP) idle=2c2/140000000000001/0 softirq=11168/11168 fqs=0 (t=10500 jiffies g=1510 c=1509 q=136) rcu_preempt kthread starved for 10500 jiffies! g1510 c1509 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1 rcu_preempt I29776 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2807 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 NMI backtrace for cpu 1 CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 4.14.143 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x197 lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x186/0x1d2 kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x43d/0xd0a kernel/rcu/tree.c:2792 update_process_times+0x31/0x70 kernel/time/timer.c:1588 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:161 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1219 __run_hrtimer kernel/time/hrtimer.c:1220 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1284 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1318 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:hhf_dequeue+0x64/0xa60 include/linux/list.h:203 RSP: 0018:ffff8880a9d66c10 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: ffff8880a56cd4c0 RBX: ffff8880a56cd438 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffff8880a56cd4d0 RDI: ffff8880a56cd440 RBP: ffff8880a9d66c60 R08: 0000000000000000 R09: ffff8880a9d5ce10 R10: ffff8880a9d5cdf0 R11: ffff8880a9d5c480 R12: dffffc0000000000 R13: ffff8880a56cd240 R14: ffff8880a56cd4d0 R15: ffff8880a56cd4c0 dequeue_skb net/sched/sch_generic.c:148 [inline] qdisc_restart net/sched/sch_generic.c:241 [inline] __qdisc_run+0x2b8/0xe00 net/sched/sch_generic.c:257 __dev_xmit_skb net/core/dev.c:3235 [inline] __dev_queue_xmit+0x1571/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55 br_nf_dev_queue_xmit+0x307/0x1440 net/bridge/br_netfilter_hooks.c:776 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_nf_post_routing+0xb80/0xf00 net/bridge/br_netfilter_hooks.c:822 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline] nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467 nf_hook include/linux/netfilter.h:205 [inline] NF_HOOK include/linux/netfilter.h:248 [inline] br_forward_finish+0x1b7/0x320 net/bridge/br_forward.c:67 br_nf_hook_thresh+0x25b/0x2e0 net/bridge/br_netfilter_hooks.c:1005 br_nf_forward_finish+0x264/0x640 net/bridge/br_netfilter_hooks.c:550 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_nf_forward_ip net/bridge/br_netfilter_hooks.c:617 [inline] br_nf_forward_ip+0x5fc/0x11d0 net/bridge/br_netfilter_hooks.c:561 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline] nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467 nf_hook include/linux/netfilter.h:205 [inline] NF_HOOK include/linux/netfilter.h:248 [inline] __br_forward+0x312/0x9c0 net/bridge/br_forward.c:111 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127 br_flood+0x43c/0x530 net/bridge/br_forward.c:222 br_handle_frame_finish+0xaf0/0x1830 net/bridge/br_input.c:210 br_nf_hook_thresh+0x25b/0x2e0 net/bridge/br_netfilter_hooks.c:1005 br_nf_pre_routing_finish_ipv6+0x621/0xc50 net/bridge/br_netfilter_ipv6.c:210 NF_HOOK include/linux/netfilter.h:250 [inline] br_nf_pre_routing_ipv6+0x417/0x790 net/bridge/br_netfilter_ipv6.c:240 br_nf_pre_routing+0xdce/0x12c7 net/bridge/br_netfilter_hooks.c:491 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline] nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467 nf_hook include/linux/netfilter.h:205 [inline] NF_HOOK include/linux/netfilter.h:248 [inline] br_handle_frame+0x80c/0x1110 net/bridge/br_input.c:348 __netif_receive_skb_core+0x789/0x2ca0 net/core/dev.c:4431 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515 process_backlog+0x21f/0x730 net/core/dev.c:5197 napi_poll net/core/dev.c:5598 [inline] net_rx_action+0x490/0xf80 net/core/dev.c:5664 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 run_ksoftirqd kernel/softirq.c:670 [inline] run_ksoftirqd+0x8c/0x1b0 kernel/softirq.c:662 smpboot_thread_fn+0x5f4/0x960 kernel/smpboot.c:164 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: rcu_sched detected stalls on CPUs/tasks: 1-...: (1 GPs behind) idle=2c2/140000000000000/0 softirq=11167/11168 fqs=2 (detected by 0, t=10569 jiffies, g=946, c=945, q=8) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 17 Comm: ksoftirqd/1 Not tainted 4.14.143 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a9d5c480 task.stack: ffff8880a9d60000 RIP: 0010:__sanitizer_cov_trace_pc+0x15/0x60 kernel/kcov.c:65 RSP: 0018:ffff8880a9d66c08 EFLAGS: 00000282 RAX: ffff8880a9d5c480 RBX: ffff8880a56cd438 RCX: 0000000000000000 RDX: 0000000000000301 RSI: ffff8880a56cd4d0 RDI: ffff8880a56cd4ec RBP: ffff8880a9d66c60 R08: 0000000000000000 R09: ffff8880a9d5ce10 R10: ffff8880a9d5cdf0 R11: ffff8880a9d5c480 R12: dffffc0000000000 R13: ffff8880a56cd240 R14: 0000000000000002 R15: ffff8880a56cd4c0 FS: 0000000000000000(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c42e75b740 CR3: 000000000766a000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dequeue_skb net/sched/sch_generic.c:148 [inline] qdisc_restart net/sched/sch_generic.c:241 [inline] __qdisc_run+0x2b8/0xe00 net/sched/sch_generic.c:257 __dev_xmit_skb net/core/dev.c:3235 [inline] __dev_queue_xmit+0x1571/0x25e0 net/core/dev.c:3493 dev_queue_xmit+0x18/0x20 net/core/dev.c:3558 br_dev_queue_push_xmit+0x367/0x530 net/bridge/br_forward.c:55 br_nf_dev_queue_xmit+0x307/0x1440 net/bridge/br_netfilter_hooks.c:776 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_nf_post_routing+0xb80/0xf00 net/bridge/br_netfilter_hooks.c:822 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline] nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467 nf_hook include/linux/netfilter.h:205 [inline] NF_HOOK include/linux/netfilter.h:248 [inline] br_forward_finish+0x1b7/0x320 net/bridge/br_forward.c:67 br_nf_hook_thresh+0x25b/0x2e0 net/bridge/br_netfilter_hooks.c:1005 br_nf_forward_finish+0x264/0x640 net/bridge/br_netfilter_hooks.c:550 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] br_nf_forward_ip net/bridge/br_netfilter_hooks.c:617 [inline] br_nf_forward_ip+0x5fc/0x11d0 net/bridge/br_netfilter_hooks.c:561 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline] nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467 nf_hook include/linux/netfilter.h:205 [inline] NF_HOOK include/linux/netfilter.h:248 [inline] __br_forward+0x312/0x9c0 net/bridge/br_forward.c:111 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:127 br_flood+0x43c/0x530 net/bridge/br_forward.c:222 br_handle_frame_finish+0xaf0/0x1830 net/bridge/br_input.c:210 br_nf_hook_thresh+0x25b/0x2e0 net/bridge/br_netfilter_hooks.c:1005 br_nf_pre_routing_finish_ipv6+0x621/0xc50 net/bridge/br_netfilter_ipv6.c:210 NF_HOOK include/linux/netfilter.h:250 [inline] br_nf_pre_routing_ipv6+0x417/0x790 net/bridge/br_netfilter_ipv6.c:240 br_nf_pre_routing+0xdce/0x12c7 net/bridge/br_netfilter_hooks.c:491 nf_hook_entry_hookfn include/linux/netfilter.h:108 [inline] nf_hook_slow+0xaf/0x1b0 net/netfilter/core.c:467 nf_hook include/linux/netfilter.h:205 [inline] NF_HOOK include/linux/netfilter.h:248 [inline] br_handle_frame+0x80c/0x1110 net/bridge/br_input.c:348 __netif_receive_skb_core+0x789/0x2ca0 net/core/dev.c:4431 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515 process_backlog+0x21f/0x730 net/core/dev.c:5197 napi_poll net/core/dev.c:5598 [inline] net_rx_action+0x490/0xf80 net/core/dev.c:5664 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 run_ksoftirqd kernel/softirq.c:670 [inline] run_ksoftirqd+0x8c/0x1b0 kernel/softirq.c:662 smpboot_thread_fn+0x5f4/0x960 kernel/smpboot.c:164 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: ff e8 13 3c ee ff 48 c7 05 d5 4f be 07 00 00 00 00 e9 2f ec ff ff 65 48 8b 04 25 40 ee 01 00 48 85 c0 74 1a 65 8b 15 4b 0b a5 7e <81> e2 00 01 1f 00 75 0b 8b 90 c8 12 00 00 83 fa 01 74 01 c3 55 rcu_sched kthread starved for 10565 jiffies! g946 c945 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_sched R running task 29824 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2807 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404