rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=30a/1/0x4000000000000002 softirq=61473/61474 fqs=5249 
rcu: 	 (t=10502 jiffies g=77245 q=635)
NMI backtrace for cpu 1
CPU: 1 PID: 32607 Comm: syz-executor2 Not tainted 4.19.0-rc8-next-20181016+ #95
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+0x244/0x39d lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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+0x16f/0x1bc kernel/rcu/tree.c:1195
 print_cpu_stall.cold.67+0x1f3/0x3c7 kernel/rcu/tree.c:1334
 check_cpu_stall kernel/rcu/tree.c:1408 [inline]
 rcu_pending kernel/rcu/tree.c:2961 [inline]
 rcu_check_callbacks+0xf3b/0x13f0 kernel/rcu/tree.c:2506
 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+0x412/0x10c0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline]
 smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804
 </IRQ>
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:771 [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 c3 3c 74 01 00 74 1f fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 90 d9 96 f9 65 8b 05 f9 34 44 78 85 c0 74 05 5b
RSP: 0018:ffff8801897ae8f0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8801daf2cc00 RCX: 1ffff100319041a4
RDX: 1ffffffff1263eb0 RSI: 0000000000000000 RDI: ffffffff8931f580
RBP: ffff8801897ae8f8 R08: ffff88018c820d20 R09: 0000000000000006
R10: 0000000000000000 R11: ffff88018c820480 R12: ffff88018c820aa0
R13: ffffffff880afda0 R14: ffff8801daf2cc00 R15: ffff88018c820480
 rq_unlock_irq kernel/sched/sched.h:1152 [inline]
 __schedule+0x168b/0x21d0 kernel/sched/core.c:3483
 schedule+0xfe/0x460 kernel/sched/core.c:3524
 do_sched_yield+0x1bf/0x2a0 kernel/sched/core.c:4955
 yield+0xb3/0xe0 kernel/sched/core.c:5030
 dev_deactivate_many+0x5d3/0xdd0 net/sched/sch_generic.c:1227
 __dev_close_many+0x197/0x380 net/core/dev.c:1461
 dev_close_many+0x2df/0x860 net/core/dev.c:1499
 rollback_registered_many+0x543/0x1250 net/core/dev.c:7968
 rollback_registered+0x1e9/0x420 net/core/dev.c:8033
 unregister_netdevice_queue+0x321/0x5e0 net/core/dev.c:9077
 unregister_netdevice include/linux/netdevice.h:2637 [inline]
 __tun_detach+0x11b8/0x15c0 drivers/net/tun.c:723
 tun_detach drivers/net/tun.c:740 [inline]
 tun_chr_close+0xe3/0x180 drivers/net/tun.c:3374
 __fput+0x3bc/0xa70 fs/file_table.c:279
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 get_signal+0x1550/0x1970 kernel/signal.c:2347
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 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: 0033:0x457569
Code: fd b3 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 b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5dccc70c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000011
RAX: fffffffffffffe00 RBX: 0000000000000004 RCX: 0000000000457569
RDX: 0000000000000027 RSI: 0000000020000240 RDI: 0000000000000007
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5dccc716d4
R13: 00000000004c3080 R14: 00000000004d4a28 R15: 00000000ffffffff