INFO: rcu_preempt self-detected stall on CPU 1-...: (1 GPs behind) idle=135/140000000000001/0 softirq=12968/12969 fqs=12498 (t=12500 jiffies g=2976 c=2975 q=2972) Task dump for CPU 1: syz-executor4 R running task 26648 11594 4120 0x2002000c 0000000000001018 4b1ebad6007cfccb ffff8801db307c10 ffffffff811cb818 0000000000000002 0000000000000000 ffff8801db31f4c0 0000000000000001 ffffffff842beec0 ffffffff842bef44 dffffc0000000000 ffff8801db307c30 Call Trace: [] sched_show_task+0x208/0x3b0 kernel/sched/core.c:5083 [] dump_cpu_task+0x71/0x90 kernel/sched/core.c:9027 [] rcu_dump_cpu_stacks+0x1bb/0x2f0 kernel/rcu/tree.c:1233 [] print_cpu_stall kernel/rcu/tree.c:1340 [inline] [] check_cpu_stall kernel/rcu/tree.c:1404 [inline] [] __rcu_pending kernel/rcu/tree.c:3892 [inline] [] rcu_pending kernel/rcu/tree.c:3956 [inline] [] rcu_check_callbacks+0x909/0x1fe0 kernel/rcu/tree.c:2796 [] update_process_times+0x3a/0x70 kernel/time/timer.c:1427 [] tick_sched_handle.isra.16+0x55/0xf0 kernel/time/tick-sched.c:151 [] tick_sched_timer+0x72/0x120 kernel/time/tick-sched.c:1097 [] __run_hrtimer kernel/time/hrtimer.c:1255 [inline] [] __hrtimer_run_queues+0x306/0xfe0 kernel/time/hrtimer.c:1319 [] hrtimer_interrupt+0x1a6/0x440 kernel/time/hrtimer.c:1353 [] local_apic_timer_interrupt+0x6a/0xb0 arch/x86/kernel/apic/apic.c:901 [] smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:925 [] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:737 [] ? audit_kill_trees+0x150/0x150 [] __xfrm_decode_session+0x63/0x100 net/xfrm/xfrm_policy.c:2397 [] __xfrm_policy_check+0x135/0x1a40 net/xfrm/xfrm_policy.c:2434 [] __xfrm_policy_check2 include/net/xfrm.h:1067 [inline] [] xfrm_policy_check include/net/xfrm.h:1076 [inline] [] xfrm6_policy_check include/net/xfrm.h:1086 [inline] [] udpv6_queue_rcv_skb+0x65d/0x1510 net/ipv6/udp.c:634 [] sk_backlog_rcv include/net/sock.h:871 [inline] [] __release_sock net/core/sock.c:2023 [inline] [] release_sock+0x176/0x510 net/core/sock.c:2473 [] udp_sendmsg+0x15c4/0x1c30 net/ipv4/udp.c:1105 [] udpv6_sendmsg+0x1434/0x2500 net/ipv6/udp.c:1178 [] inet_sendmsg+0x2bc/0x4c0 net/ipv4/af_inet.c:755 [] sock_sendmsg_nosec net/socket.c:625 [inline] [] sock_sendmsg+0xca/0x110 net/socket.c:635 [] SYSC_sendto+0x2c8/0x340 net/socket.c:1665 [] SyS_sendto+0x40/0x50 net/socket.c:1633 [] do_syscall_32_irqs_on arch/x86/entry/common.c:390 [inline] [] do_fast_syscall_32+0x314/0x890 arch/x86/entry/common.c:457 [] sysenter_flags_fixed+0xd/0x17