rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=5c6/1/0x4000000000000004 softirq=84505/84507 fqs=5166 
rcu: 	 (t=10502 jiffies g=77153 q=2474)
NMI backtrace for cpu 1
CPU: 1 PID: 22611 Comm: syz-executor.5 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
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:100
Code: 66 ea ff 48 c7 05 44 22 cd 08 00 00 00 00 e9 ca e9 ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 48 8b 75 08 <65> 48 8b 04 25 40 ee 01 00 65 8b 15 28 97 96 7e 81 e2 00 01 1f 00
RSP: 0000:ffff8880ae9074c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff88805f8e82f8 RCX: ffffffff858e78e9
RDX: 0000000000000000 RSI: ffffffff858e7d9b RDI: ffff88805f8e83ac
RBP: ffff8880ae9074c8 R08: ffff8880883ba0c0 R09: 0000000000000005
R10: ffff8880883baa08 R11: 00000000a2c00dff R12: dffffc0000000000
R13: ffff88805f8e8040 R14: 0000000000000000 R15: 0000000000000000
 hhf_dequeue+0x56b/0xa00 net/sched/sch_hhf.c:437
 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: 0033:0x40e8af
Code: 0f 1f 00 48 83 e8 08 48 8b 10 48 39 ca 77 f4 48 39 e8 76 18 48 89 57 f8 4c 89 00 48 8b 50 f8 49 8b 0c 24 4c 8b 07 48 83 c7 08 <eb> bf 4c 89 ea 48 89 ef e8 34 ff ff ff 48 89 e8 4c 29 e0 48 3d 87
RSP: 002b:00007ffcd2c57840 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13
RAX: 00007f0ff820bf38 RBX: 00007f0ff820be50 RCX: ffffffff83226573
RDX: ffffffff83226573 RSI: 00007f0ff820c098 RDI: 00007f0ff820bf40
RBP: 00007f0ff820bf30 R08: ffffffff83226573 R09: 000000005027f4c0
R10: 00007ffcd2c57bc0 R11: 0000000000000246 R12: 00007f0ff820be40
R13: 000000000000000d R14: 00007f0ff820bf30 R15: 000000000000ad6f