INFO: rcu_sched self-detected stall on CPU
	0-...!: (1 GPs behind) idle=b06/140000000000001/0 softirq=79550/79551 fqs=49 
	 (t=125000 jiffies g=46182 c=46181 q=345)
rcu_sched kthread starved for 124787 jiffies! g46182 c46181 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1
rcu_sched       I23456     8      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2799 [inline]
 __schedule+0x8eb/0x2060 kernel/sched/core.c:3375
 schedule+0xf5/0x430 kernel/sched/core.c:3434
 schedule_timeout+0x118/0x230 kernel/time/timer.c:1795
 rcu_gp_kthread+0x9e5/0x1930 kernel/rcu/tree.c:2314
 kthread+0x33c/0x400 kernel/kthread.c:238
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515
NMI backtrace for cpu 0
CPU: 0 PID: 5820 Comm: syz-executor7 Not tainted 4.15.0-rc5+ #174
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x122/0x180 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+0x186/0x1d9 kernel/rcu/tree.c:1459
 print_cpu_stall kernel/rcu/tree.c:1608 [inline]
 check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1676
 __rcu_pending kernel/rcu/tree.c:3440 [inline]
 rcu_pending kernel/rcu/tree.c:3502 [inline]
 rcu_check_callbacks+0x256/0xd00 kernel/rcu/tree.c:2842
 update_process_times+0x30/0x60 kernel/time/timer.c:1630
 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162
 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1166
 __run_hrtimer kernel/time/hrtimer.c:1211 [inline]
 __hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1275
 hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1309
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:904
RIP: 0010:_decode_session6+0x550/0x1380 net/ipv6/xfrm6_policy.c:148
RSP: 0018:ffff8801db2069a8 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff11
RAX: 1ffff10038278c40 RBX: ffff8801c13c6140 RCX: ffff8801c13c6204
RDX: 0000000000000100 RSI: 000000000000edf9 RDI: ffff8801c13c61c4
RBP: ffff8801db206a30 R08: ffffed0035da2031 R09: ffffed0035da2031
R10: 000000000000000b R11: ffffed0035da2030 R12: 000000000000f8b9
R13: ffff8801db206d08 R14: 000000000000f268 R15: dffffc0000000000
 __xfrm_decode_session+0x68/0x110 net/xfrm/xfrm_policy.c:2358
 __xfrm_policy_check+0x18c/0x2350 net/xfrm/xfrm_policy.c:2393
 __xfrm_policy_check2 include/net/xfrm.h:1170 [inline]
 xfrm_policy_check include/net/xfrm.h:1175 [inline]
 xfrm6_policy_check include/net/xfrm.h:1185 [inline]
 ip6_input_finish+0x127b/0x17a0 net/ipv6/ip6_input.c:302
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327
 dst_input include/net/dst.h:449 [inline]
 ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71
 NF_HOOK include/linux/netfilter.h:250 [inline]
 ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208
 __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4499
 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4564
 process_backlog+0x203/0x740 net/core/dev.c:5244
 napi_poll net/core/dev.c:5642 [inline]
 net_rx_action+0x792/0x1910 net/core/dev.c:5708
 __do_softirq+0x2d7/0xb85 kernel/softirq.c:285
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1115
 </IRQ>
 do_softirq.part.21+0x14d/0x190 kernel/softirq.c:329
 do_softirq kernel/softirq.c:177 [inline]
 __local_bh_enable_ip+0x1ee/0x230 kernel/softirq.c:182
 local_bh_enable include/linux/bottom_half.h:32 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:727 [inline]
 ip6_finish_output2+0xba0/0x23a0 net/ipv6/ip6_output.c:121
 ip6_finish_output+0x698/0xaf0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:239 [inline]
 ip6_output+0x1eb/0x840 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:443 [inline]
 ip6_local_out+0x95/0x160 net/ipv6/output_core.c:176
 ip6_send_skb+0xa1/0x330 net/ipv6/ip6_output.c:1674
 ip6_push_pending_frames+0xb3/0xe0 net/ipv6/ip6_output.c:1694
 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline]
 rawv6_sendmsg+0x2ee9/0x3e70 net/ipv6/raw.c:935
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
 sock_sendmsg_nosec net/socket.c:628 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:638
 SYSC_sendto+0x361/0x5c0 net/socket.c:1719
 SyS_sendto+0x40/0x50 net/socket.c:1687
 entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007f22dc4f5c58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 000000000000ff49 RSI: 000000002081effb RDI: 0000000000000013
RBP: 0000000000000477 R08: 00000000201e0000 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f4bc8
R13: 00000000ffffffff R14: 00007f22dc4f66d4 R15: 0000000000000000