rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=50a/1/0x4000000000000002 softirq=136325/136326 fqs=5239 rcu: (t=10500 jiffies g=217329 q=154) NMI backtrace for cpu 0 CPU: 0 PID: 23597 Comm: syz-executor3 Not tainted 4.19.0-rc4+ #249 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+0x1c4/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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:162 [inline] rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1340 print_cpu_stall.cold.78+0x2d3/0x524 kernel/rcu/tree.c:1478 check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3276 [inline] rcu_pending kernel/rcu/tree.c:3319 [inline] rcu_check_callbacks+0xfd9/0x1990 kernel/rcu/tree.c:2665 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:1029 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1054 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864 </IRQ> RIP: 0010:__sanitizer_cov_trace_cmp4+0x3/0x20 kernel/kcov.c:162 Code: 0f 1f 80 00 00 00 00 55 0f b7 d6 0f b7 f7 bf 02 00 00 00 48 89 e5 48 8b 4d 08 e8 08 ff ff ff 5d c3 66 0f 1f 44 00 00 55 89 f2 <89> fe bf 04 00 00 00 48 89 e5 48 8b 4d 08 e8 ea fe ff ff 5d c3 0f RSP: 0018:ffff880172f36f10 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff880196c6a000 RCX: ffffc9000311f000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff880172f36fe8 R08: ffff8801d8ea6000 R09: 1ffffffff12b43d5 R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: dffffc0000000000 R13: ffffed002e5e6df0 R14: 0000000000000000 R15: ffff880172f37698 xfrm_lookup_with_ifid+0x2a1/0x2b80 net/xfrm/xfrm_policy.c:2063 xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline] xfrm_lookup_route+0x3c/0x1f0 net/xfrm/xfrm_policy.c:2211 ip6_dst_lookup_flow+0x1c6/0x270 net/ipv6/ip6_output.c:1083 inet6_csk_route_socket+0x8bd/0x1020 net/ipv6/inet6_connection_sock.c:110 inet6_csk_xmit+0x118/0x630 net/ipv6/inet6_connection_sock.c:125 l2tp_xmit_core net/l2tp/l2tp_core.c:1030 [inline] l2tp_xmit_skb+0x1465/0x1860 net/l2tp/l2tp_core.c:1132 pppol2tp_sendmsg+0x4b1/0x6c0 net/l2tp/l2tp_ppp.c:329 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x51d/0x930 net/socket.c:2116 __sys_sendmmsg+0x246/0x6d0 net/socket.c:2211 __do_sys_sendmmsg net/socket.c:2240 [inline] __se_sys_sendmmsg net/socket.c:2237 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2237 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6e500e4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f6e500e56d4 RCX: 0000000000457679 RDX: 0800000000000059 RSI: 0000000020005fc0 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d50e8 R14: 00000000004c351b R15: 0000000000000000