rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=d8a/1/0x4000000000000004 softirq=27781/27781 fqs=5212 
rcu: 	 (t=10500 jiffies g=28081 q=5002)
NMI backtrace for cpu 0
CPU: 0 PID: 7517 Comm: syz-fuzzer Not tainted 4.19.71 #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
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:183 [inline]
RIP: 0010:hhf_dequeue+0x662/0xa00 net/sched/sch_hhf.c:438
Code: 4e 03 00 00 4d 8b bd 58 03 00 00 48 89 df 48 8b 55 c8 4c 89 fe e8 2e 47 97 fd 31 ff 89 c6 88 45 b0 e8 a2 dd dc fb 0f b6 75 b0 <40> 84 f6 0f 84 e1 f9 ff ff e8 50 dc dc fb 4c 89 f0 48 c1 e8 03 42
RSP: 0000:ffff8880ae8074d8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000501 RBX: ffff88808b1f2bb8 RCX: ffffffff858e8a2e
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8880ae807528 R08: ffff888085fec140 R09: 0000000000000005
R10: ffff888085feca88 R11: 00000000a8d3cea4 R12: dffffc0000000000
R13: ffff88808b1f2900 R14: ffff88808b1f2c58 R15: ffff88808b1f2c50
 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
 neigh_resolve_output net/core/neighbour.c:1369 [inline]
 neigh_resolve_output+0x5b7/0x980 net/core/neighbour.c:1349
 neigh_output include/net/neighbour.h:501 [inline]
 ip6_finish_output2+0xb7f/0x2550 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x574/0xbe0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:447 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ndisc_send_skb+0xf3b/0x1460 net/ipv6/ndisc.c:491
 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:685
 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3821
 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers kernel/time/timer.c:1682 [inline]
 __run_timers kernel/time/timer.c:1650 [inline]
 run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1695
 __do_softirq+0x25c/0x921 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0033:0x412197
Code: 78 48 c1 ef 03 48 83 e7 03 89 bc 24 80 00 00 00 48 89 b4 24 88 00 00 00 48 89 94 24 90 00 00 00 48 8b 6c 24 48 48 83 c4 50 c3 <48> 29 fb 48 8b 56 68 48 39 d3 72 3b 0f b6 4e 66 48 d3 eb 80 f9 40
RSP: 002b:000000c42026fe28 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 000000c420000000 RBX: 000000c421409d70 RCX: 000000c420001b00
RDX: 0000000000000000 RSI: 00007f2cd157d3a8 RDI: 000000c421408000
RBP: 000000c42026fe70 R08: 0000000000000001 R09: fffffffffd3b2e70
R10: 0000000000000040 R11: 000000c421409d70 R12: 0000000000000000
R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000100
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 	0-....: (10648 ticks this GP) idle=d8a/1/0x4000000000000002 softirq=27641/27781 fqs=5199 
rcu: 	(detected by 1, t=10503 jiffies, g=1333, q=8)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7517 Comm: syz-fuzzer Not tainted 4.19.71 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0xb1/0xf5 lib/list_debug.c:54
Code: 02 00 75 53 49 8b 14 24 4c 39 f2 0f 85 99 00 00 00 49 8d 7d 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <75> 24 49 8b 55 08 4c 39 f2 0f 85 aa 00 00 00 41 5c b8 01 00 00 00
RSP: 0000:ffff8880ae8074b0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff88808b1f2bb8 RCX: ffffffff858e8489
RDX: 1ffff1101163e58b RSI: ffffffff858e893b RDI: ffff88808b1f2c58
RBP: ffff8880ae8074c8 R08: ffff888085fec140 R09: 0000000000000005
R10: ffff888085feca88 R11: 00000000a8d3cea4 R12: ffff88808b1f2c50
R13: ffff88808b1f2c50 R14: ffff88808b1f2bb8 R15: 0000000000000000
FS:  000000c4200cc490(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000010 CR3: 00000000a0a5c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __list_del_entry include/linux/list.h:117 [inline]
 list_move_tail include/linux/list.h:182 [inline]
 hhf_dequeue+0x5aa/0xa00 net/sched/sch_hhf.c:438
 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
 neigh_resolve_output net/core/neighbour.c:1369 [inline]
 neigh_resolve_output+0x5b7/0x980 net/core/neighbour.c:1349
 neigh_output include/net/neighbour.h:501 [inline]
 ip6_finish_output2+0xb7f/0x2550 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x574/0xbe0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:447 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 ndisc_send_skb+0xf3b/0x1460 net/ipv6/ndisc.c:491
 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:685
 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3821
 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers kernel/time/timer.c:1682 [inline]
 __run_timers kernel/time/timer.c:1650 [inline]
 run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1695
 __do_softirq+0x25c/0x921 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0033:0x412197
Code: 78 48 c1 ef 03 48 83 e7 03 89 bc 24 80 00 00 00 48 89 b4 24 88 00 00 00 48 89 94 24 90 00 00 00 48 8b 6c 24 48 48 83 c4 50 c3 <48> 29 fb 48 8b 56 68 48 39 d3 72 3b 0f b6 4e 66 48 d3 eb 80 f9 40
RSP: 002b:000000c42026fe28 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 000000c420000000 RBX: 000000c421409d70 RCX: 000000c420001b00
RDX: 0000000000000000 RSI: 00007f2cd157d3a8 RDI: 000000c421408000
RBP: 000000c42026fe70 R08: 0000000000000001 R09: fffffffffd3b2e70
R10: 0000000000000040 R11: 000000c421409d70 R12: 0000000000000000
R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000100