rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=80e/0/0x3 softirq=7835/7835 fqs=9 
	(t=10501 jiffies g=6513 q=219)
rcu: rcu_preempt kthread starved for 10484 jiffies! g6513 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29128    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x877/0xc50 kernel/sched/core.c:3880
 schedule+0x131/0x1e0 kernel/sched/core.c:3947
 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1807
 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline]
 rcu_gp_kthread+0xef8/0x1790 kernel/rcu/tree.c:1768
 kthread+0x332/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc8+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113
 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2736 [inline]
 rcu_sched_clock_irq+0xb95/0x16d0 kernel/rcu/tree.c:2183
 update_process_times+0x134/0x190 kernel/time/timer.c:1639
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x403/0x850 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:__list_add include/linux/list.h:60 [inline]
RIP: 0010:list_add_tail include/linux/list.h:93 [inline]
RIP: 0010:list_move_tail include/linux/list.h:214 [inline]
RIP: 0010:hhf_dequeue+0x529/0xaa0 net/sched/sch_hhf.c:439
Code: 2d 2c 67 fb 4c 8b 7d a0 48 8b 7d b0 48 89 fb 48 c1 eb 03 42 80 3c 23 00 74 09 e8 62 27 a0 fb 48 8b 7d b0 4c 8b 37 48 8b 7d c0 <4c> 89 f6 48 8b 55 a8 e8 eb 61 47 fd 84 c0 74 75 e8 f2 2b 67 fb 42
RSP: 0018:ffff8880aeb08f98 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11014351222 RBX: 1ffff11014351223 RCX: ffff8880a98bc340
RDX: 0000000000000302 RSI: 0000000000000000 RDI: ffff8880a1a89078
RBP: ffff8880aeb09040 R08: ffffffff860c5d6a R09: 0000000000000000
R10: fffffbfff117be8d R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8880a1a88d80 R14: ffff8880a1a89110 R15: ffff8880a1a89100
 dequeue_skb net/sched/sch_generic.c:258 [inline]
 qdisc_restart net/sched/sch_generic.c:361 [inline]
 __qdisc_run+0x217/0x1b30 net/sched/sch_generic.c:379
 __dev_xmit_skb net/core/dev.c:3533 [inline]
 __dev_queue_xmit+0x1161/0x3020 net/core/dev.c:3838
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3902
 br_dev_queue_push_xmit+0x551/0x650 net/bridge/br_forward.c:52
 br_nf_dev_queue_xmit+0x312/0x1590 include/linux/skbuff.h:4084
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_nf_post_routing+0xa5f/0xea0 net/bridge/br_netfilter_hooks.c:844
 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
 nf_hook_slow+0xc8/0x210 net/netfilter/core.c:512
 nf_hook+0x23a/0x310 include/linux/netfilter.h:260
 NF_HOOK include/linux/netfilter.h:303 [inline]
 br_forward_finish+0x7a/0xc0 net/bridge/br_forward.c:65
 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1014 [inline]
 br_nf_forward_finish+0x8f4/0xc80 net/bridge/br_netfilter_hooks.c:560
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_nf_forward_ip+0xed4/0x13f0 net/bridge/br_netfilter_hooks.c:630
 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
 nf_hook_slow+0xc8/0x210 net/netfilter/core.c:512
 nf_hook+0x23a/0x310 include/linux/netfilter.h:260
 NF_HOOK include/linux/netfilter.h:303 [inline]
 __br_forward+0x39e/0x720 net/bridge/br_forward.c:109
 br_flood+0x7af/0x840 net/bridge/br_forward.c:234
 br_handle_frame_finish+0xf37/0x1370 net/bridge/br_input.c:162
 br_nf_hook_thresh+0x306/0x390 net/bridge/br_netfilter_hooks.c:1014
 br_nf_pre_routing_finish_ipv6+0x8ac/0xb30 net/bridge/br_netfilter_ipv6.c:187
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_nf_pre_routing_ipv6+0x2ab/0x350 net/bridge/br_netfilter_ipv6.c:236
 br_nf_pre_routing+0x6ca/0x1380 net/bridge/br_netfilter_hooks.c:501
 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline]
 nf_hook_bridge_pre net/bridge/br_input.c:223 [inline]
 br_handle_frame+0x7d9/0xeb0 net/bridge/br_input.c:348
 __netif_receive_skb_core+0x1a7d/0x3470 net/core/dev.c:4905
 __netif_receive_skb_one_core net/core/dev.c:5002 [inline]
 __netif_receive_skb+0xc5/0x370 net/core/dev.c:5118
 process_backlog+0x4d8/0x910 net/core/dev.c:5929
 napi_poll net/core/dev.c:6352 [inline]
 net_rx_action+0x5ef/0xfd0 net/core/dev.c:6418
 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x227/0x230 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 30 fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 74 a1 30 fa eb b0 90 90 e9 07 00 00 00 0f 00 2d 96 a0 46 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 86 a0 46 00 f4 c3 90 90 55 48 89 e5
RSP: 0018:ffff8880a98c7e10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11150f3 RBX: ffff8880a98bc340 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff812b7a1a RDI: ffffffff877be46a
RBP: ffff8880a98c7e18 R08: ffffffff81790e74 R09: ffffed1015317869
R10: ffffed1015317869 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff11015317868 R14: dffffc0000000000 R15: 0000000000000001
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
 default_idle_call+0x59/0xa0 kernel/sched/idle.c:94
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x140/0x6d0 kernel/sched/idle.c:263
 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:354
 start_secondary+0x3a5/0x430 arch/x86/kernel/smpboot.c:264
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241