rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=62e/1/0x4000000000000004 softirq=27414/27416 fqs=4000 
	(t=10500 jiffies g=38093 q=1135)
rcu: rcu_preempt kthread starved for 2476 jiffies! g38093 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I28840    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xd9/0x260 kernel/sched/core.c:3947
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807
 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline]
 rcu_gp_kthread+0x9b2/0x18c0 kernel/rcu/tree.c:1768
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 8213 Comm: syz-executor.4 Not tainted 5.3.0-rc7+ #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:1106 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1131
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
RIP: 0010:hhf_dequeue+0x586/0xa20 net/sched/sch_hhf.c:438
Code: 48 c1 e8 03 42 0f b6 14 20 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 b5 03 00 00 45 8b b5 ac 03 00 00 e8 6a 91 aa fb <49> 8d bd 14 03 00 00 48 89 f8 48 c1 e8 03 42 0f b6 14 20 48 89 f8
RSP: 0018:ffff8880ae9096f8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffff88806ce04640 RBX: ffff888094e8c2f8 RCX: ffffffff85c7df19
RDX: 0000000000000100 RSI: ffffffff85c7e3e6 RDI: ffff888094e8c3ac
RBP: ffff8880ae909748 R08: ffff88806ce04640 R09: fffffbfff14e9755
R10: ffff88806ce04f98 R11: ffff88806ce04640 R12: dffffc0000000000
R13: ffff888094e8c000 R14: 0000000000000000 R15: 0000000000000000
 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
 br_send_bpdu_finish net/bridge/br_stp_bpdu.c:32 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 br_send_bpdu.isra.0.constprop.0+0x5ce/0xa70 net/bridge/br_stp_bpdu.c:59
 br_send_config_bpdu+0x68c/0x7a0 net/bridge/br_stp_bpdu.c:120
 br_transmit_config.part.0+0x517/0x780 net/bridge/br_stp.c:203
 br_transmit_config net/bridge/br_stp.c:364 [inline]
 br_config_bpdu_generation+0x1d2/0x230 net/bridge/br_stp.c:362
 br_hello_timer_expired+0xab/0x190 net/bridge/br_stp_timer.c:37
 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:1133
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:191
Code: 48 c7 c0 50 f4 f2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d 42 e4 b1 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 8c b1 0d fa 65 8b 05 dd ed c0 78
RSP: 0018:ffff88806ce0f780 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e5e8a RBX: 0000000000000286 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: ffff88806ce0f790 R08: 1ffffffff14e9740 R09: fffffbfff14e9741
R10: fffffbfff14e9740 R11: ffffffff8a74ba07 R12: ffffffff890352e0
R13: 0000000000000400 R14: 0000000000028400 R15: 0000000000000400
 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline]
 pcpu_alloc+0x49d/0x1350 mm/percpu.c:1701
 __alloc_percpu+0x25/0x30 mm/percpu.c:1796
 xt_percpu_counter_alloc+0x13c/0x1b0 net/netfilter/x_tables.c:1842
 find_check_entry.isra.0+0xb3/0x920 net/ipv4/netfilter/ip_tables.c:527
 translate_table+0xcb4/0x17d0 net/ipv4/netfilter/ip_tables.c:717
 do_replace net/ipv4/netfilter/ip_tables.c:1136 [inline]
 do_ipt_set_ctl+0x2ef/0x492 net/ipv4/netfilter/ip_tables.c:1672
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x77/0xd0 net/netfilter/nf_sockopt.c:115
 ip_setsockopt net/ipv4/ip_sockglue.c:1260 [inline]
 ip_setsockopt+0xdf/0x100 net/ipv4/ip_sockglue.c:1240
 tcp_setsockopt net/ipv4/tcp.c:3149 [inline]
 tcp_setsockopt+0x8f/0xe0 net/ipv4/tcp.c:3143
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3142
 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c41a
Code: 49 89 ca b8 37 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ba 8c fb ff c3 66 0f 1f 84 00 00 00 00 00 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffc538f8ab8 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffc538f8ae0 RCX: 000000000045c41a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000714e80 R08: 00000000000002d8 R09: 0000000000004000
R10: 0000000000712d20 R11: 0000000000000206 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000712cc0