rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10501 ticks this GP) idle=856/1/0x4000000000000004 softirq=39625/39625 fqs=0 
	(t=10502 jiffies g=55269 q=1257)
rcu: rcu_preempt kthread starved for 10503 jiffies! g55269 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29392    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 0
CPU: 0 PID: 9870 Comm: syz-executor.0 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:__sanitizer_cov_trace_const_cmp1+0x9/0x20 kernel/kcov.c:175
Code: 00 55 48 89 f2 48 89 fe bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 40 0f b6 d6 40 0f b6 f7 <bf> 01 00 00 00 48 89 e5 48 8b 4d 08 e8 f6 fe ff ff 5d c3 0f 1f 40
RSP: 0018:ffff8880ae809178 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: ffff888066ebde38 RCX: ffffffff85c65e49
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880ae8091d8 R08: ffff8880a1fa85c0 R09: 0000000000000000
R10: fffffbfff134af9f R11: ffff8880a1fa85c0 R12: dffffc0000000000
R13: ffff888066ebdb40 R14: 0000000000000001 R15: 0000000000000000
 dequeue_skb net/sched/sch_generic.c:263 [inline]
 qdisc_restart net/sched/sch_generic.c:366 [inline]
 __qdisc_run+0x1e5/0x1a00 net/sched/sch_generic.c:384
 __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
 arp_xmit_finish net/ipv4/arp.c:630 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 arp_xmit+0xdf/0x3f0 net/ipv4/arp.c:639
 arp_send_dst.part.0+0x202/0x280 net/ipv4/arp.c:317
 arp_send_dst net/ipv4/arp.c:390 [inline]
 arp_solicit+0x752/0x1380 net/ipv4/arp.c:389
 neigh_probe+0xc6/0x110 net/core/neighbour.c:1012
 __neigh_event_send+0x3e3/0x1760 net/core/neighbour.c:1172
 neigh_event_send include/net/neighbour.h:445 [inline]
 neigh_resolve_output+0x5cf/0x970 net/core/neighbour.c:1474
 neigh_output include/net/neighbour.h:511 [inline]
 ip_finish_output2+0x8a5/0x2570 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:308 [inline]
 __ip_finish_output+0x5fc/0xb90 net/ipv4/ip_output.c:290
 ip_finish_output+0x38/0x1f0 net/ipv4/ip_output.c:318
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip_output+0x21f/0x640 net/ipv4/ip_output.c:432
 dst_output include/net/dst.h:436 [inline]
 ip_local_out+0xbb/0x190 net/ipv4/ip_output.c:125
 __ip_queue_xmit+0x86f/0x1bd0 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x5a/0x70 include/net/ip.h:236
 dccp_transmit_skb+0x966/0x1290 net/dccp/output.c:138
 dccp_retransmit_skb+0x118/0x170 net/dccp/output.c:387
 dccp_retransmit_timer net/dccp/timer.c:101 [inline]
 dccp_write_timer+0x43f/0x1420 net/dccp/timer.c:153
 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:kfree+0x239/0x2c0 mm/slab.c:3757
Code: 55 7e 0f 85 20 fe ff ff e8 14 2f 54 ff e9 16 fe ff ff e8 ca b8 cb ff 48 83 3d c2 bb 26 07 00 0f 84 85 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 41 5c 41 5d 41 5e 5d c3 e8 a4 b8 cb ff 48 83 3d
RSP: 0018:ffff88809825fa30 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffffffff134b5de
RDX: 0000000000000000 RSI: ffffffff8177f1ae RDI: 0000000000000286
RBP: ffff88809825fa50 R08: ffff8880a1fa85c0 R09: fffffbfff134afa0
R10: fffffbfff134af9f R11: ffffffff89a57cff R12: ffff88809a1e06c0
R13: ffff8880aa4001c0 R14: ffffffff8197cdb1 R15: ffff88809a1e0ec8
 kvfree+0x61/0x70 mm/util.c:488
 xt_free_table_info+0xba/0x180 net/netfilter/x_tables.c:1192
 __do_replace+0x6ec/0x910 net/ipv4/netfilter/ip_tables.c:1087
 do_replace net/ipv4/netfilter/ip_tables.c:1140 [inline]
 do_ipt_set_ctl+0x327/0x492 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:3146 [inline]
 tcp_setsockopt+0x8f/0xe0 net/ipv4/tcp.c:3140
 sock_common_setsockopt+0x94/0xd0 net/core/sock.c:3139
 __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:00007ffd1f7a2888 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ffd1f7a28b0 RCX: 000000000045c41a
RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000714e80 R08: 0000000000000370 R09: 0000000000004000
R10: 00000000007133e0 R11: 0000000000000206 R12: 0000000000000003
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000713380