rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=a32/1/0x4000000000000004 softirq=62356/62360 fqs=1 
	(t=10500 jiffies g=79653 q=1055)
rcu: rcu_preempt kthread starved for 10497 jiffies! g79653 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29240    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x934/0x1f90 kernel/sched/core.c:4081
 schedule+0xdc/0x2b0 kernel/sched/core.c:4155
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1821
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 19239 Comm: syz-executor.4 Not tainted 5.5.0-rc6-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+0x197/0x210 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b 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:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc0d kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:153 [inline]
RIP: 0010:write_comp_data+0x9/0x70 kernel/kcov.c:208
Code: 13 00 00 8b 80 84 13 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 c0 1e 02 00 <65> 8b 05 98 28 8d 7e a9 00 01 1f 00 75 51 41 8b 80 80 13 00 00 83
RSP: 0018:ffffc90000007c20 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff88803ccae5c0 RBX: 0000000000000104 RCX: ffffffff839f802a
RDX: 0000000000000104 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc90000007c28 R08: ffff88803ccae5c0 R09: ffffed1015d0703d
R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: 0000000000000000
R13: ffffc90000007db0 R14: 0000000000000000 R15: dffffc0000000000
 check_preemption_disabled lib/smp_processor_id.c:16 [inline]
 debug_smp_processor_id+0x2a/0x18a lib/smp_processor_id.c:57
 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:970 [inline]
 rcu_lockdep_current_cpu_online+0x39/0x130 kernel/rcu/tree.c:961
 rcu_read_lock_held_common kernel/rcu/update.c:109 [inline]
 rcu_read_lock_held_common+0xbd/0x130 kernel/rcu/update.c:99
 rcu_read_lock_sched_held+0x5b/0xd0 kernel/rcu/update.c:120
 trace_timer_expire_exit include/trace/events/timer.h:125 [inline]
 call_timer_fn+0x698/0x780 kernel/time/timer.c:1405
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4f/0x80 kernel/locking/spinlock.c:199
Code: c0 e8 34 93 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 92 e4 be 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 27 3a 7c f9 65 8b 05 18 ce 2d 78 85 c0 74 06 41
RSP: 0018:ffffc90001be7980 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff132669d RBX: ffff88803ccae5c0 RCX: 0000000000000007
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffff88803ccaee54
RBP: ffffc90001be7988 R08: 1ffffffff165e7a2 R09: fffffbfff165e7a3
R10: fffffbfff165e7a2 R11: ffffffff8b2f3d17 R12: ffff8880ae837340
R13: ffff8880537ee480 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3124 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3224
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x93c/0x1f90 kernel/sched/core.c:4081
 preempt_schedule_irq+0xb5/0x160 kernel/sched/core.c:4338
 retint_kernel+0x1b/0x2b
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline]
RIP: 0010:queue_work_on+0x126/0x210 kernel/workqueue.c:1517
Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 d4 00 00 00 48 83 3d c2 36 46 08 00 0f 84 96 00 00 00 e8 6f f7 27 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 60 f7 27 00 44 89 f8 48 83 c4 08 5b 41 5c 41 5d
RSP: 0018:ffffc90001be7ba8 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: 0000000000000216 RCX: ffffc90008891000
RDX: 000000000000856d RSI: ffffffff814cfe21 RDI: 0000000000000216
RBP: ffffc90001be7bd8 R08: 1ffffffff165e7a2 R09: fffffbfff165e7a3
R10: fffffbfff165e7a2 R11: ffffffff8b2f3d17 R12: 0000000000000200
R13: ffff8880a714e300 R14: ffff8880aa426c00 R15: 0000000000000001
 queue_work include/linux/workqueue.h:494 [inline]
 schedule_work include/linux/workqueue.h:552 [inline]
 nfc_genl_rcv_nl_event net/nfc/netlink.c:1820 [inline]
 nfc_genl_rcv_nl_event+0x1fe/0x280 net/nfc/netlink.c:1805
 notifier_call_chain+0xc2/0x230 kernel/notifier.c:83
 __blocking_notifier_call_chain kernel/notifier.c:284 [inline]
 __blocking_notifier_call_chain kernel/notifier.c:271 [inline]
 blocking_notifier_call_chain kernel/notifier.c:295 [inline]
 blocking_notifier_call_chain+0x94/0xb0 kernel/notifier.c:292
 netlink_release+0xc74/0x1c60 net/netlink/af_netlink.c:774
 __sock_release+0xce/0x280 net/socket.c:592
 sock_close+0x1e/0x30 net/socket.c:1270
 __fput+0x2ff/0x890 fs/file_table.c:280
 ____fput+0x16/0x20 fs/file_table.c:313
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x676/0x790 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x414ae1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 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:00007fcda80eb9c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00000000000000b8 RCX: 0000000000414ae1
RDX: 0000000000000200 RSI: 00007fcda80eba40 RDI: 0000000000000010
RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fcda80eba40
R13: 00000000004d5450 R14: 00000000004e6ae0 R15: 00000000ffffffff