rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=5d2/1/0x4000000000000002 softirq=100287/100287 fqs=5237 (t=10500 jiffies g=157117 q=50430) NMI backtrace for cpu 0 CPU: 0 PID: 27379 Comm: syz-executor.1 Not tainted 5.2.0+ #67 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+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:1068 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1093 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:preempt_count_sub+0x35/0x150 kernel/sched/core.c:3639 Code: 00 00 00 00 fc ff df 48 89 c1 48 89 e5 53 83 e0 07 48 c1 e9 03 83 c0 03 89 fb 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 e8 00 00 00 <8b> 0d d5 e3 3b 09 85 c9 75 1b 65 8b 05 d2 4f b3 7e 89 c2 81 e2 ff RSP: 0018:ffff8880613f7448 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000003 RBX: 0000000000000001 RCX: 1ffffffff1515230 RDX: 0000000000000004 RSI: ffffffff833de7bc RDI: 0000000000000001 RBP: ffff8880613f7450 R08: ffff88809248e340 R09: ffffed1015d06c7c R10: ffffed1015d06c7b R11: ffff8880ae8363db R12: ffffffff88dae800 R13: 000000000000000a R14: ffff8880613f7840 R15: 0000000000000000 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:946 [inline] rcu_lockdep_current_cpu_online+0xe3/0x130 kernel/rcu/tree.c:933 rcu_read_lock_held+0x8a/0xd0 kernel/rcu/update.c:268 xfrm_sk_policy_lookup+0x329/0x510 net/xfrm/xfrm_policy.c:2161 xfrm_lookup_with_ifid+0x1de/0x1fb0 net/xfrm/xfrm_policy.c:3035 xfrm_lookup net/xfrm/xfrm_policy.c:3172 [inline] xfrm_lookup_route+0x3b/0x1f0 net/xfrm/xfrm_policy.c:3183 ip6_dst_lookup_flow+0x189/0x220 net/ipv6/ip6_output.c:1156 inet6_csk_route_socket+0x85d/0xe80 net/ipv6/inet6_connection_sock.c:106 inet6_csk_xmit+0x110/0x5ba net/ipv6/inet6_connection_sock.c:121 l2tp_xmit_core net/l2tp/l2tp_core.c:1030 [inline] l2tp_xmit_skb+0x1112/0x13e0 net/l2tp/l2tp_core.c:1132 pppol2tp_sendmsg+0x4af/0x6c0 net/l2tp/l2tp_ppp.c:325 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:657 ___sys_sendmsg+0x3e2/0x920 net/socket.c:2311 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg net/socket.c:2439 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2439 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459829 Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7ae4c70c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459829 RDX: 04000000000000ec RSI: 0000000020000000 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7ae4c716d4 R13: 00000000004c6fe8 R14: 00000000004dc518 R15: 00000000ffffffff