rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10500 ticks this GP) idle=4be/1/0x4000000000000002 softirq=394643/394643 fqs=5242 rcu: (t=10500 jiffies g=521901 q=226) NMI backtrace for cpu 1 CPU: 1 PID: 26740 Comm: syz-executor0 Not tainted 5.0.0-rc3+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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.c:1211 print_cpu_stall.cold+0x227/0x40c kernel/rcu/tree.c:1348 check_cpu_stall kernel/rcu/tree.c:1422 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks+0xb32/0x1380 kernel/rcu/tree.c:2521 update_process_times+0x32/0x80 kernel/time/timer.c:1635 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x3a7/0x1050 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2016 [inline] RIP: 0010:xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2053 [inline] RIP: 0010:xfrm_policy_lookup_bytype+0xb58/0xdb0 net/xfrm/xfrm_policy.c:2113 Code: 8b c1 fa 49 c1 ed 03 b9 f8 f8 ff ff 66 43 89 4c 25 00 e9 d8 fe ff ff e8 56 8b c1 fa 0f 0b e8 4f 8b c1 fa 0f 0b e8 48 8b c1 fa <48> 8b 85 18 fe ff ff 48 8d 7b 08 c6 00 00 48 89 f8 48 c1 e8 03 42 RSP: 0018:ffff8880ae706d10 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 RAX: ffff8880688684c0 RBX: ffff888046a42940 RCX: ffffffff86c071d6 RDX: 0000000000000100 RSI: ffffffff86c073a8 RDI: 0000000000000005 RBP: ffff8880ae706f18 R08: ffff8880688684c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 00000000fffffffd R14: ffff888046a429f4 R15: 00000000ffffffff xfrm_policy_lookup+0x7e/0x90 net/xfrm/xfrm_policy.c:2145 __xfrm_policy_check+0x1426/0x2b00 net/xfrm/xfrm_policy.c:3354 __xfrm_policy_check2 include/net/xfrm.h:1166 [inline] xfrm_policy_check include/net/xfrm.h:1175 [inline] xfrm6_policy_check include/net/xfrm.h:1185 [inline] udpv6_queue_rcv_one_skb+0x532/0x1750 net/ipv6/udp.c:615 udpv6_queue_rcv_skb+0x128/0x730 net/ipv6/udp.c:699 __udp6_lib_mcast_deliver net/ipv6/udp.c:812 [inline] __udp6_lib_rcv+0x1e8d/0x30d0 net/ipv6/udp.c:916 udpv6_rcv+0x22/0x30 net/ipv6/udp.c:1026 ip6_protocol_deliver_rcu+0x3aa/0x1940 net/ipv6/ip6_input.c:394 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_input+0xf9/0x600 net/ipv6/ip6_input.c:443 ip6_mc_input+0x4f9/0x10d0 net/ipv6/ip6_input.c:537 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x177/0x330 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ipv6_rcv+0x113/0x650 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core+0x160/0x210 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083 process_backlog+0x206/0x750 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x76d/0x1930 net/core/dev.c:6412 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337 do_softirq+0x18/0x20 kernel/softirq.c:325 netif_rx_ni+0x4fd/0x860 net/core/dev.c:4569 dev_loopback_xmit+0x29b/0x8c0 net/core/dev.c:3576 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_finish_output2+0x1a03/0x28e0 net/ipv6/ip6_output.c:84 ip6_fragment+0x2a70/0x3780 net/ipv6/ip6_output.c:727 ip6_finish_output+0x6aa/0xc30 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x23c/0xa00 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] ip6_local_out+0xc4/0x1b0 net/ipv6/output_core.c:176 ip6_send_skb+0xbb/0x350 net/ipv6/ip6_output.c:1727 udp_v6_send_skb.isra.0+0x839/0x14f0 net/ipv6/udp.c:1177 udpv6_sendmsg+0x2ba8/0x3570 net/ipv6/udp.c:1474 inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 __sys_sendto+0x387/0x5f0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5b834e1c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000458099 RDX: 000000000000fc43 RSI: 0000000020000300 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000020000100 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5b834e26d4 R13: 00000000004c568c R14: 00000000004d9358 R15: 00000000ffffffff