rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (10500 ticks this GP) idle=cbe/1/0x4000000000000002 softirq=17774/17774 fqs=5249 
rcu: 	 (t=10502 jiffies g=16353 q=3022)
NMI backtrace for cpu 1
CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.19.72 #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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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:164 [inline]
 rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682
 update_process_times+0x32/0x80 kernel/time/timer.c:1636
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:164
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0010:__list_del include/linux/list.h:105 [inline]
RIP: 0010:__list_del_entry include/linux/list.h:120 [inline]
RIP: 0010:__list_del_entry include/linux/list.h:115 [inline]
RIP: 0010:list_move_tail include/linux/list.h:182 [inline]
RIP: 0010:hhf_dequeue+0x5f6/0xa00 net/sched/sch_hhf.c:438
Code: 0f 85 e6 03 00 00 48 8d 7b 08 4c 8b 3b 48 89 fa 48 c1 ea 03 42 80 3c 22 00 0f 85 c3 03 00 00 49 8d 7f 08 4c 8b 73 08 48 89 fa <48> c1 ea 03 42 80 3c 22 00 0f 85 9f 03 00 00 4c 89 f2 4d 89 77 08
RSP: 0018:ffff8880aa2a6998 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11010f0f85f RBX: ffff88808787c2f8 RCX: ffffffff858e7de6
RDX: ffff88808787c398 RSI: ffffffff858e7df0 RDI: ffff88808787c398
RBP: ffff8880aa2a69e8 R08: ffff8880aa2944c0 R09: 0000000000000006
R10: ffff8880aa294e30 R11: 000000004fa8078c R12: dffffc0000000000
R13: ffff88808787c040 R14: ffff88808787c390 R15: ffff88808787c390
 dequeue_skb net/sched/sch_generic.c:277 [inline]
 qdisc_restart net/sched/sch_generic.c:380 [inline]
 __qdisc_run+0x1e7/0x1960 net/sched/sch_generic.c:398
 __dev_xmit_skb net/core/dev.c:3501 [inline]
 __dev_queue_xmit+0x165c/0x2fe0 net/core/dev.c:3811
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3876
 br_dev_queue_push_xmit+0x405/0x5d0 net/bridge/br_forward.c:56
 br_nf_dev_queue_xmit+0x365/0x1610 net/bridge/br_netfilter_hooks.c:779
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 br_nf_post_routing+0x76f/0x12f0 net/bridge/br_netfilter_hooks.c:825
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 br_forward_finish+0x215/0x400 net/bridge/br_forward.c:69
 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1008
 br_nf_forward_finish+0x356/0x700 net/bridge/br_netfilter_hooks.c:553
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 br_nf_forward_ip net/bridge/br_netfilter_hooks.c:620 [inline]
 br_nf_forward_ip+0x6b4/0x17c0 net/bridge/br_netfilter_hooks.c:564
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 __br_forward+0x393/0xb30 net/bridge/br_forward.c:113
 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:129
 br_flood+0x5fa/0x710 net/bridge/br_forward.c:238
 br_handle_frame_finish+0xf72/0x1510 net/bridge/br_input.c:167
 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1008
 br_nf_pre_routing_finish_ipv6+0x6ed/0xd70 net/bridge/br_netfilter_ipv6.c:210
 NF_HOOK include/linux/netfilter.h:289 [inline]
 br_nf_pre_routing_ipv6+0x4a5/0x8ca net/bridge/br_netfilter_ipv6.c:240
 br_nf_pre_routing+0x1016/0x159c net/bridge/br_netfilter_hooks.c:494
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 br_handle_frame+0x985/0x1480 net/bridge/br_input.c:306
 __netif_receive_skb_core+0xac1/0x3570 net/core/dev.c:4861
 __netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:4930
 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5044
 process_backlog+0x23a/0x7a0 net/core/dev.c:5855
 napi_poll net/core/dev.c:6278 [inline]
 net_rx_action+0x4f5/0x1070 net/core/dev.c:6344
 __do_softirq+0x25c/0x921 kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:653 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:645
 smpboot_thread_fn+0x6a3/0xa30 kernel/smpboot.c:164
 kthread+0x354/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 	1-....: (10542 ticks this GP) idle=cbe/1/0x4000000000000000 softirq=17769/17774 fqs=5218 
rcu: 	(detected by 0, t=10502 jiffies, g=-247, q=1)
Sending NMI from CPU 0 to CPUs 1:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.143 msecs
NMI backtrace for cpu 1
CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.19.72 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data+0x0/0x70 kernel/kcov.c:121
Code: 83 fa 02 75 20 48 8b 88 d8 12 00 00 8b 80 d4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 <65> 4c 8b 04 25 40 ee 01 00 65 8b 05 e0 96 96 7e a9 00 01 1f 00 75
RSP: 0018:ffff8880aa2a6980 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88808787c2f8 RCX: ffffffff858e78e9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff8880aa2a6988 R08: ffff8880aa2944c0 R09: 0000000000000006
R10: ffff8880aa294e30 R11: 000000004fa8078c R12: dffffc0000000000
R13: ffff88808787c040 R14: ffff88808787c390 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ec22000 CR3: 000000000866d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 hhf_dequeue+0xb9/0xa00 net/sched/sch_hhf.c:433
 dequeue_skb net/sched/sch_generic.c:277 [inline]
 qdisc_restart net/sched/sch_generic.c:380 [inline]
 __qdisc_run+0x1e7/0x1960 net/sched/sch_generic.c:398
 __dev_xmit_skb net/core/dev.c:3501 [inline]
 __dev_queue_xmit+0x165c/0x2fe0 net/core/dev.c:3811
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3876
 br_dev_queue_push_xmit+0x405/0x5d0 net/bridge/br_forward.c:56
 br_nf_dev_queue_xmit+0x365/0x1610 net/bridge/br_netfilter_hooks.c:779
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 br_nf_post_routing+0x76f/0x12f0 net/bridge/br_netfilter_hooks.c:825
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 br_forward_finish+0x215/0x400 net/bridge/br_forward.c:69
 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1008
 br_nf_forward_finish+0x356/0x700 net/bridge/br_netfilter_hooks.c:553
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 br_nf_forward_ip net/bridge/br_netfilter_hooks.c:620 [inline]
 br_nf_forward_ip+0x6b4/0x17c0 net/bridge/br_netfilter_hooks.c:564
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 __br_forward+0x393/0xb30 net/bridge/br_forward.c:113
 deliver_clone+0x61/0xc0 net/bridge/br_forward.c:129
 br_flood+0x5fa/0x710 net/bridge/br_forward.c:238
 br_handle_frame_finish+0xf72/0x1510 net/bridge/br_input.c:167
 br_nf_hook_thresh+0x2e9/0x370 net/bridge/br_netfilter_hooks.c:1008
 br_nf_pre_routing_finish_ipv6+0x6ed/0xd70 net/bridge/br_netfilter_ipv6.c:210
 NF_HOOK include/linux/netfilter.h:289 [inline]
 br_nf_pre_routing_ipv6+0x4a5/0x8ca net/bridge/br_netfilter_ipv6.c:240
 br_nf_pre_routing+0x1016/0x159c net/bridge/br_netfilter_hooks.c:494
 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline]
 nf_hook_slow+0xbc/0x1e0 net/netfilter/core.c:511
 nf_hook include/linux/netfilter.h:244 [inline]
 NF_HOOK include/linux/netfilter.h:287 [inline]
 br_handle_frame+0x985/0x1480 net/bridge/br_input.c:306
 __netif_receive_skb_core+0xac1/0x3570 net/core/dev.c:4861
 __netif_receive_skb_one_core+0xa8/0x1a0 net/core/dev.c:4930
 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5044
 process_backlog+0x23a/0x7a0 net/core/dev.c:5855
 napi_poll net/core/dev.c:6278 [inline]
 net_rx_action+0x4f5/0x1070 net/core/dev.c:6344
 __do_softirq+0x25c/0x921 kernel/softirq.c:292
 run_ksoftirqd kernel/softirq.c:653 [inline]
 run_ksoftirqd+0x8e/0x110 kernel/softirq.c:645
 smpboot_thread_fn+0x6a3/0xa30 kernel/smpboot.c:164
 kthread+0x354/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415