rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (1 GPs behind) idle=2da/1/0x4000000000000002 softirq=237635/237638 fqs=5249 rcu: (t=10502 jiffies g=335849 q=585) NMI backtrace for cpu 1 CPU: 1 PID: 26129 Comm: syz-executor3 Not tainted 4.20.0-rc7+ #358 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+0x1d3/0x2c6 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1c2/0x22c 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+0x16f/0x1bc kernel/rcu/tree.c:1195 print_cpu_stall.cold.65+0x1f3/0x3c6 kernel/rcu/tree.c:1334 check_cpu_stall kernel/rcu/tree.c:1408 [inline] rcu_pending kernel/rcu/tree.c:2961 [inline] rcu_check_callbacks+0xac1/0x1410 kernel/rcu/tree.c:2506 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+0x41c/0x10d0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:write_comp_data+0x22/0x70 kernel/kcov.c:122 Code: 90 90 90 90 90 90 90 90 55 48 89 e5 65 4c 8b 04 25 40 ee 01 00 65 8b 05 6c 35 83 7e a9 00 01 1f 00 75 51 41 8b 80 d8 12 00 00 <83> f8 03 75 45 49 8b 80 e0 12 00 00 45 8b 80 dc 12 00 00 4c 8b 08 RSP: 0018:ffff88819b716310 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff86ccdb98 RDX: 00000000ffffffff RSI: 0000000000000000 RDI: 0000000000000004 RBP: ffff88819b716310 R08: ffff8881929d66c0 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8881929d66c0 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888180f16940 R15: 00000000ffffffff __sanitizer_cov_trace_cmp4+0x16/0x20 kernel/kcov.c:162 __xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2019 [inline] xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2053 [inline] xfrm_policy_lookup_bytype+0xc48/0xe70 net/xfrm/xfrm_policy.c:2113 xfrm_policy_lookup+0x7e/0x80 net/xfrm/xfrm_policy.c:2145 __xfrm_policy_check+0x14f0/0x2c40 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+0x517/0x16b0 net/ipv6/udp.c:615 udpv6_queue_rcv_skb+0x594/0x8f0 net/ipv6/udp.c:699 __udp6_lib_mcast_deliver net/ipv6/udp.c:812 [inline] __udp6_lib_rcv+0x1ecf/0x3190 net/ipv6/udp.c:916 udplitev6_rcv+0x21/0x30 net/ipv6/udplite.c:20 ip6_protocol_deliver_rcu+0x372/0x1940 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] ip6_input+0xe9/0x600 net/ipv6/ip6_input.c:443 ip6_mc_input+0x514/0x11c0 net/ipv6/ip6_input.c:537 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x17a/0x330 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0x115/0x640 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5083 netif_receive_skb_internal+0x12c/0x6b0 net/core/dev.c:5186 napi_frags_finish net/core/dev.c:5753 [inline] napi_gro_frags+0xd82/0x1050 net/core/dev.c:5827 tun_get_user+0x3111/0x4200 drivers/net/tun.c:1972 tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:2017 call_write_iter include/linux/fs.h:1857 [inline] do_iter_readv_writev+0x8b0/0xa80 fs/read_write.c:680 do_iter_write+0x185/0x5f0 fs/read_write.c:959 vfs_writev+0x1f1/0x360 fs/read_write.c:1004 do_writev+0x11a/0x310 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+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457521 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 b5 fb ff c3 48 83 ec 08 e8 1a 2d 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 63 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fb96d441ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000083 RCX: 0000000000457521 RDX: 0000000000000001 RSI: 00007fb96d441bf0 RDI: 00000000000000f0 RBP: 0000000020000500 R08: 00000000000000f0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fb96d4426d4 R13: 00000000004c53b4 R14: 00000000004d9900 R15: 00000000ffffffff