rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=742/1/0x4000000000000002 softirq=22905/22905 fqs=0 
rcu: 	 (t=10500 jiffies g=26345 q=12)
rcu: rcu_preempt kthread starved for 10500 jiffies! g26345 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29136    10      2 0x80000000
Call Trace:
 schedule+0x8d/0x1b0 kernel/sched/core.c:3559
 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806
 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202
 kthread+0x34a/0x420 kernel/kthread.c:246
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 12049 Comm: syz-executor.3 Not tainted 4.19.118-syzkaller #0
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+0x188/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x170/0x1bb kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x634/0xddc kernel/rcu/tree.c:2682
 update_process_times+0x2a/0x70 kernel/time/timer.c:1638
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: fa eb 82 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 04 f0 67 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d f4 ef 67 00 fb f4 <c3> 90 41 56 41 55 41 54 55 53 e8 13 c2 36 fa e8 2e 79 36 fc 0f 1f
RSP: 0018:ffff888091327060 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a4acc RBX: ffff88809b2df568 RCX: 1ffff11011cf6136
RDX: dffffc0000000000 RSI: ffff88808e7b0990 RDI: ffff88808e7b08c4
RBP: 0000000000000003 R08: ffff88808e7b0040 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286
R13: ffffed101365bead R14: 0000000000000001 R15: ffff8880ae72cfc0
 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
 kvm_wait arch/x86/kernel/kvm.c:799 [inline]
 kvm_wait+0x1b1/0x240 arch/x86/kernel/kvm.c:779
 pv_wait arch/x86/include/asm/paravirt.h:689 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:471 [inline]
 __pv_queued_spin_lock_slowpath+0x8d6/0xb20 kernel/locking/qspinlock.c:474
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:679 [inline]
 queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:53 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:88 [inline]
 do_raw_spin_lock+0x19a/0x240 kernel/locking/spinlock_debug.c:113
 spin_lock include/linux/spinlock.h:329 [inline]
 __dev_xmit_skb net/core/dev.c:3473 [inline]
 __dev_queue_xmit+0x14aa/0x3040 net/core/dev.c:3814
 neigh_hh_output include/net/neighbour.h:491 [inline]
 neigh_output include/net/neighbour.h:499 [inline]
 ip6_finish_output2+0x1301/0x2540 net/ipv6/ip6_output.c:120
 ip6_finish_output+0x571/0xbe0 net/ipv6/ip6_output.c:154
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip6_output+0x209/0x760 net/ipv6/ip6_output.c:171
 dst_output include/net/dst.h:447 [inline]
 NF_HOOK include/linux/netfilter.h:289 [inline]
 NF_HOOK include/linux/netfilter.h:283 [inline]
 ip6_xmit+0xe44/0x2030 net/ipv6/ip6_output.c:275
 inet6_csk_xmit+0x2fb/0x5ba net/ipv6/inet6_connection_sock.c:139
 __tcp_transmit_skb+0x19d5/0x3750 net/ipv4/tcp_output.c:1146
 tcp_transmit_skb net/ipv4/tcp_output.c:1162 [inline]
 tcp_write_xmit+0x1409/0x5230 net/ipv4/tcp_output.c:2387
 __tcp_push_pending_frames+0xaa/0x260 net/ipv4/tcp_output.c:2563
 tcp_sendmsg_locked+0x252d/0x2ff0 net/ipv4/tcp.c:1400
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1452
 inet_sendmsg+0x12e/0x590 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 __sys_sendto+0x21a/0x330 net/socket.c:1787
 __do_sys_sendto net/socket.c:1799 [inline]
 __se_sys_sendto net/socket.c:1795 [inline]
 __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1795
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c829
Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc9003cbc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000500d00 RCX: 000000000045c829
RDX: 00000000fffffdda RSI: 00000000200000c0 RDI: 0000000000000009
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000004000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a09 R14: 00000000004ccbed R15: 00007fc9003cc6d4