INFO: rcu_sched self-detected stall on CPU
	0-....: (1 GPs behind) idle=a22/1/4611686018427387906 softirq=70196/70197 fqs=31224 
	 (t=125000 jiffies g=39489 c=39488 q=2304)
NMI backtrace for cpu 0
CPU: 0 PID: 19262 Comm: syz-executor0 Not tainted 4.17.0-rc3+ #40
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+0x1b9/0x294 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x151/0x192 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:156 [inline]
 rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1376
 print_cpu_stall kernel/rcu/tree.c:1525 [inline]
 check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_switch+0x53/0x90 kernel/kcov.c:224
RSP: 0018:ffff88019351e158 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000002 RBX: 0000000000000009 RCX: ffffffff868d9d58
RDX: 0000000000000000 RSI: 0000000000000084 RDI: 0000000000000001
RBP: ffff88019351e180 R08: ffff8801b6960000 R09: ffff88019351e318
R10: ffffed00326a3c6d R11: ffff88019351e36f R12: ffffffff88565ec0
R13: 0000000000000000 R14: 0000000000000001 R15: 000000000000000b
 _decode_session6+0x4c8/0x14f0 net/ipv6/xfrm6_policy.c:154
 __xfrm_decode_session+0x71/0x140 net/xfrm/xfrm_policy.c:2368
 xfrm_decode_session_reverse include/net/xfrm.h:1213 [inline]
 icmpv6_route_lookup+0x395/0x6e0 net/ipv6/icmp.c:372
 icmp6_send+0x1982/0x2da0 net/ipv6/icmp.c:551
 icmpv6_send+0x17a/0x300 net/ipv6/ip6_icmp.c:43
 ip6_input_finish+0x14e1/0x1a30 net/ipv6/ip6_input.c:305
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ip6_input+0xe1/0x5e0 net/ipv6/ip6_input.c:327
 dst_input include/net/dst.h:450 [inline]
 ip6_rcv_finish+0x29c/0xa10 net/ipv6/ip6_input.c:71
 NF_HOOK include/linux/netfilter.h:288 [inline]
 ipv6_rcv+0xeb8/0x2040 net/ipv6/ip6_input.c:208
 __netif_receive_skb_core+0x2468/0x3650 net/core/dev.c:4646
 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4711
 netif_receive_skb_internal+0x126/0x7b0 net/core/dev.c:4785
 netif_receive_skb+0xba/0x400 net/core/dev.c:4809
 tun_rx_batched.isra.53+0x4ba/0x8c0 drivers/net/tun.c:1560
 tun_get_user+0x2ac3/0x4290 drivers/net/tun.c:1968
 tun_chr_write_iter+0xb9/0x154 drivers/net/tun.c:1996
 call_write_iter include/linux/fs.h:1784 [inline]
 do_iter_readv_writev+0x859/0xa50 fs/read_write.c:680
 do_iter_write+0x185/0x5f0 fs/read_write.c:959
 vfs_writev+0x1c7/0x330 fs/read_write.c:1004
 do_writev+0x112/0x2f0 fs/read_write.c:1039
 __do_sys_writev fs/read_write.c:1112 [inline]
 __se_sys_writev fs/read_write.c:1109 [inline]
 __x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455831
RSP: 002b:00007fb77d004ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000000fdef RCX: 0000000000455831
RDX: 0000000000000001 RSI: 00007fb77d004bf0 RDI: 00000000000000fc
RBP: 00000000200001c0 R08: 00000000000000fc R09: 0000000000000000
R10: 000000000000fdef R11: 0000000000000293 R12: 00000000ffffffff
R13: 00000000000006ad R14: 00000000006fe0d8 R15: 0000000000000000