rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=50a/1/0x4000000000000004 softirq=13362/13365 fqs=5230 
	(t=10500 jiffies g=15613 q=2227)
NMI backtrace for cpu 0
CPU: 0 PID: 11277 Comm: syz-executor.2 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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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+0x183/0x1cf 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.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:__read_once_size include/linux/compiler.h:199 [inline]
RIP: 0010:list_empty include/linux/list.h:268 [inline]
RIP: 0010:hhf_dequeue+0x506/0xa20 net/sched/sch_hhf.c:429
Code: 00 0f 85 35 04 00 00 4c 89 f8 4c 89 7b 08 48 c1 e8 03 42 80 3c 20 00 0f 85 12 04 00 00 49 89 1f e9 4b fb ff ff e8 7a 05 ac fb <48> 8b 45 b8 4c 8b 75 c8 42 80 3c 20 00 0f 85 3a 04 00 00 49 8b 85
RSP: 0018:ffff8880ae809518 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffff88804f266380 RBX: ffff88809b5f62f8 RCX: ffffffff85c670f9
RDX: 0000000000000100 RSI: ffffffff85c66f86 RDI: ffff88809b5f6300
RBP: ffff8880ae809568 R08: ffff88804f266380 R09: 0000000000000000
R10: fffffbfff134afaf R11: ffff88804f266380 R12: dffffc0000000000
R13: ffff88809b5f6000 R14: ffff88809b5f6380 R15: ffff88809b5f6390
 dequeue_skb net/sched/sch_generic.c:258 [inline]
 qdisc_restart net/sched/sch_generic.c:361 [inline]
 __qdisc_run+0x1e7/0x19d0 net/sched/sch_generic.c:379
 __dev_xmit_skb net/core/dev.c:3533 [inline]
 __dev_queue_xmit+0x16f1/0x3650 net/core/dev.c:3838
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902
 neigh_hh_output include/net/neighbour.h:500 [inline]
 neigh_output include/net/neighbour.h:509 [inline]
 ip6_finish_output2+0xf58/0x2520 net/ipv6/ip6_output.c:116
 __ip6_finish_output+0x444/0xa50 net/ipv6/ip6_output.c:142
 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip6_output+0x235/0x7c0 net/ipv6/ip6_output.c:175
 dst_output include/net/dst.h:436 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ndisc_send_skb+0xf29/0x1450 net/ipv6/ndisc.c:504
 ndisc_send_rs+0x134/0x6d0 net/ipv6/ndisc.c:698
 addrconf_rs_timer+0x30f/0x680 net/ipv6/addrconf.c:3879
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
 expire_timers kernel/time/timer.c:1366 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 __run_timers kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x54/0x90 kernel/locking/spinlock.c:199
Code: c0 60 f4 d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 75 be 94 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 d2 8b 10 fa 65 8b 05 03 c8 c3 78 85 c0 74 06 41
RSP: 0018:ffff88804f26f720 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e8c RBX: 0000000000000000 RCX: 1ffffffff134b5ee
RDX: dffffc0000000000 RSI: ffffffff8177f15e RDI: ffffffff873e35c8
RBP: ffff88804f26f728 R08: ffff88804f266380 R09: ffffed1012e94fad
R10: ffffed1012e94fac R11: ffff8880974a7d63 R12: ffff8880974a7d60
R13: ffffea0001efa880 R14: 0000000000000001 R15: 0000000000000000
 spin_unlock_irq include/linux/spinlock.h:388 [inline]
 shmem_add_to_page_cache+0xd1a/0x14c0 mm/shmem.c:632
 shmem_getpage_gfp+0xeb0/0x2680 mm/shmem.c:1860
 shmem_getpage mm/shmem.c:139 [inline]
 shmem_write_begin+0x105/0x1e0 mm/shmem.c:2467
 generic_perform_write+0x23b/0x540 mm/filemap.c:3327
 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3456
 generic_file_write_iter+0x356/0x620 mm/filemap.c:3488
 call_write_iter include/linux/fs.h:1870 [inline]
 new_sync_write+0x4d3/0x770 fs/read_write.c:483
 __vfs_write+0xe1/0x110 fs/read_write.c:496
 vfs_write+0x268/0x5d0 fs/read_write.c:558
 ksys_pwrite64+0x183/0x1c0 fs/read_write.c:665
 __do_sys_pwrite64 fs/read_write.c:675 [inline]
 __se_sys_pwrite64 fs/read_write.c:672 [inline]
 __x64_sys_pwrite64+0x97/0xf0 fs/read_write.c:672
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x413837
Code: 12 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a1 18 00 00 c3 48 83 ec 08 e8 a7 f9 ff ff 48 89 04 24 49 89 ca b8 12 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 ed f9 ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fd75022aa80 EFLAGS: 00000293 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 0000000020001790 RCX: 0000000000413837
RDX: 0000000008100000 RSI: 0000000020000180 RDI: 0000000000000006
RBP: 0000000000000000 R08: fe03f80fe03f80ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000006
R13: 00000000004c89b9 R14: 00000000004df918 R15: 00000000ffffffff