rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10500 ticks this GP) idle=aae/1/0x4000000000000002 softirq=23362/23362 fqs=0 
rcu: 	 (t=10501 jiffies g=30537 q=558)
rcu: rcu_preempt kthread starved for 10502 jiffies! g30537 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I22872    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
 schedule+0xfe/0x460 kernel/sched/core.c:3517
 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
 rcu_gp_kthread+0x9d9/0x2310 kernel/rcu/tree.c:2194
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
NMI backtrace for cpu 1
CPU: 1 PID: 12586 Comm: syz-executor4 Not tainted 4.19.0+ #299
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+0x1c4/0x2b6 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:arch_local_irq_enable arch/x86/include/asm/paravirt.h:798 [inline]
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x56/0x80 kernel/locking/spinlock.c:192
Code: 31 89 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 32 48 83 3d fb c1 80 01 00 74 1f fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 a0 f5 a3 f9 65 8b 05 99 bd 50 78 85 c0 74 05 5b
RSP: 0018:ffff8801965fec68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8801daf2cb40 RCX: 1ffff100382401c4
RDX: 1ffffffff1263e43 RSI: 0000000000000000 RDI: ffffffff8931f218
RBP: ffff8801965fec70 R08: ffff8801c1200e20 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8801c1200580 R12: ffff8801c1200ba0
R13: ffffffff880af880 R14: ffff8801daf2cb40 R15: ffff8801c1200580
 rq_unlock_irq kernel/sched/sched.h:1849 [inline]
 __schedule+0x150b/0x1ed0 kernel/sched/core.c:3476
 schedule+0xfe/0x460 kernel/sched/core.c:3517
 do_sched_yield+0x1bf/0x2a0 kernel/sched/core.c:4950
 yield+0xb3/0xe0 kernel/sched/core.c:5025
 dev_deactivate_many+0x5d3/0xdd0 net/sched/sch_generic.c:1187
 __dev_close_many+0x197/0x380 net/core/dev.c:1461
 dev_close_many+0x2df/0x860 net/core/dev.c:1499
 rollback_registered_many+0x543/0x1210 net/core/dev.c:7953
 rollback_registered+0x1e9/0x420 net/core/dev.c:8018
 unregister_netdevice_queue+0x321/0x5e0 net/core/dev.c:9062
 unregister_netdevice include/linux/netdevice.h:2599 [inline]
 __tun_detach+0x11b8/0x15c0 drivers/net/tun.c:730
 tun_detach drivers/net/tun.c:747 [inline]
 tun_chr_close+0xe3/0x180 drivers/net/tun.c:3234
 __fput+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x411021
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffd28766af0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000007 RCX: 0000000000411021
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 0000000000000000 R08: ffffffff81382a63 R09: 00000000e0a6260d
R10: 00007ffd28766a20 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000000000d6 R15: 0000000000000004