======================================
| [ 15.552103][ C2] #5: ffffffff8bc220b8 (kernfs_idr_lock){+.+.}-{3:3}, at: kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
| [ 15.552515][ C2] #6: ffffffff8b9749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.552919][    C2]
| [   15.552919][    C2] stack backtrace:
[   15.553190][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.553192][    C2] Workqueue: netns cleanup_net
[   15.553197][    C2] Call Trace:
[   15.553199][    C2]  <IRQ>
[ 15.553201][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.553207][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.553212][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.553216][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.553221][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.553226][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.553230][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.553233][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.553237][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.553240][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.553244][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.553247][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.553250][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.553253][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.553256][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.553259][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.553263][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.553266][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.553272][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.553275][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.553280][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.553284][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.553287][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.553290][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.553294][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.553297][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:5870) 
[ 15.553300][ C2] ? _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.553303][ C2] ? kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.553305][ C2] ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724 fs/kernfs/dir.c:1715) 
[ 15.553309][ C2] ? sysfs_unmerge_group (fs/sysfs/group.c:401 (discriminator 3)) 
[ 15.553312][ C2] ? dpm_sysfs_remove (drivers/base/power/sysfs.c:836) 
[ 15.553317][ C2] ? device_del (drivers/base/core.c:3857) 
[ 15.553320][ C2] ? unregister_netdevice_many_notify (net/core/dev.c:2767 (discriminator 3) net/core/dev.c:12114 (discriminator 3)) 
[ 15.553325][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.553328][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.553332][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.553335][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.553339][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.553344][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.553348][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4326) 
[ 15.553351][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 15.553353][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.553358][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.553362][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.553367][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.553370][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.553373][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.553376][    C2]  </IRQ>
[   15.553378][    C2]  <TASK>
[ 15.553379][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.553382][ C2] RIP: 0010:lock_acquire.part.0 (kernel/locking/lockdep.c:5870) 
[ 15.553385][ C2] Code: ff ff ff 65 0f c1 05 ed 8d 13 05 83 f8 01 0f 85 3e 01 00 00 9c 58 f6 c4 02 0f 85 29 01 00 00 48 85 db 74 01 fb 48 8b 44 24 30 <65> 48 2b 05 5e 51 13 05 0f 85 3a 01 00 00 48 83 c4 38 5b 5d 41 5c
All code
========
   0:	ff                   	(bad)
   1:	ff                   	(bad)
   2:	ff 65 0f             	jmp    *0xf(%rbp)
   5:	c1 05 ed 8d 13 05 83 	roll   $0x83,0x5138ded(%rip)        # 0x5138df9
   c:	f8                   	clc
   d:	01 0f                	add    %ecx,(%rdi)
   f:	85 3e                	test   %edi,(%rsi)
  11:	01 00                	add    %eax,(%rax)
  13:	00 9c 58 f6 c4 02 0f 	add    %bl,0xf02c4f6(%rax,%rbx,2)
  1a:	85 29                	test   %ebp,(%rcx)
  1c:	01 00                	add    %eax,(%rax)
  1e:	00 48 85             	add    %cl,-0x7b(%rax)
  21:	db 74 01 fb          	(bad)  -0x5(%rcx,%rax,1)
  25:	48 8b 44 24 30       	mov    0x30(%rsp),%rax
  2a:*	65 48 2b 05 5e 51 13 	sub    %gs:0x513515e(%rip),%rax        # 0x5135190		<-- trapping instruction
  31:	05 
  32:	0f 85 3a 01 00 00    	jne    0x172
  38:	48 83 c4 38          	add    $0x38,%rsp
  3c:	5b                   	pop    %rbx
  3d:	5d                   	pop    %rbp
  3e:	41 5c                	pop    %r12

Code starting with the faulting instruction
===========================================
   0:	65 48 2b 05 5e 51 13 	sub    %gs:0x513515e(%rip),%rax        # 0x5135166
   7:	05 
   8:	0f 85 3a 01 00 00    	jne    0x148
   e:	48 83 c4 38          	add    $0x38,%rsp
  12:	5b                   	pop    %rbx
  13:	5d                   	pop    %rbp
  14:	41 5c                	pop    %r12
[   15.553388][    C2] RSP: 0018:ffffc900000c7780 EFLAGS: 00000206
[   15.553391][    C2] RAX: f1801e24fbd78300 RBX: 0000000000000200 RCX: 0000000000000001
[   15.553393][    C2] RDX: 0000000000000000 RSI: ffffffff8b472ecb RDI: ffffffff8ac513a0
[   15.553395][    C2] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
[   15.553396][    C2] R10: 00000000000000c8 R11: ffffffff8bc220b8 R12: 0000000000000000
[   15.553398][    C2] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8bc220b8
[ 15.553404][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.553407][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.553410][ C2] ? kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.553414][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.553417][ C2] ? kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.553420][ C2] kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.553424][ C2] kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724 fs/kernfs/dir.c:1715) 
[ 15.553428][ C2] sysfs_unmerge_group (fs/sysfs/group.c:401 (discriminator 3)) 
[ 15.553431][ C2] dpm_sysfs_remove (drivers/base/power/sysfs.c:836) 
[ 15.553434][ C2] device_del (drivers/base/core.c:3857) 
[ 15.553438][ C2] ? __pfx_device_del (drivers/base/core.c:3836) 
[ 15.553441][ C2] ? netdev_unregister_kobject (net/core/net-sysfs.c:2308) 
[ 15.553448][ C2] unregister_netdevice_many_notify (net/core/dev.c:2767 (discriminator 3) net/core/dev.c:12114 (discriminator 3)) 
[ 15.553453][ C2] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:12003) 
[ 15.553457][ C2] ? rtnl_is_locked (net/core/rtnetlink.c:169) 
[ 15.553462][ C2] ? unregister_netdevice_queue (net/core/dev.c:11975) 
[ 15.553465][ C2] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11974) 
[ 15.553471][ C2] ? lockdep_rtnl_is_held (net/core/rtnetlink.c:182) 
[ 15.553473][ C2] ? sit_exit_rtnl_net (net/ipv6/sit.c:1822 (discriminator 1)) 
[ 15.553479][ C2] ops_undo_list (net/core/net_namespace.c:190 net/core/net_namespace.c:249) 
[ 15.553483][ C2] ? __pfx_ops_undo_list (net/core/net_namespace.c:224) 
[ 15.553487][ C2] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:412) 
[ 15.553491][ C2] cleanup_net (net/core/net_namespace.c:688) 
[ 15.553494][ C2] ? __pfx_cleanup_net (net/core/net_namespace.c:652) 
[ 15.553498][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.553502][ C2] process_one_work (kernel/workqueue.c:3238) 
[ 15.553509][ C2] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 15.553515][ C2] ? assign_work (kernel/workqueue.c:1200) 
[ 15.553520][ C2] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 15.553525][ C2] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 15.553528][ C2] kthread (kernel/kthread.c:464) 
[ 15.553533][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.553536][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 15.553539][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.553542][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.553545][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.553548][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.553551][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.553554][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.580021][    C2] RCU nest depth: 0, expected: 0
| [   15.580234][    C2] INFO: lockdep is turned off.
| [   15.580437][    C2] Preemption disabled at:
| [ 15.580439][ C2] 0x0 
[   15.580812][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.580814][    C2] Workqueue: netns cleanup_net
[   15.580822][    C2] Call Trace:
[   15.580824][    C2]  <IRQ>
[ 15.580827][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.580833][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.580840][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.580844][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.580847][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.580852][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.580857][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 15.580862][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.580865][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.580870][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 15.580875][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.580878][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.580884][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.580887][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.580892][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.580897][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.580900][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.580905][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.580909][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.580913][ C2] ? lock_acquire.part.0 (kernel/locking/lockdep.c:5870) 
[ 15.580916][ C2] ? _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.580920][ C2] ? kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.580924][ C2] ? kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724 fs/kernfs/dir.c:1715) 
[ 15.580928][ C2] ? sysfs_unmerge_group (fs/sysfs/group.c:401 (discriminator 3)) 
[ 15.580931][ C2] ? dpm_sysfs_remove (drivers/base/power/sysfs.c:836) 
[ 15.580935][ C2] ? device_del (drivers/base/core.c:3857) 
[ 15.580938][ C2] ? unregister_netdevice_many_notify (net/core/dev.c:2767 (discriminator 3) net/core/dev.c:12114 (discriminator 3)) 
[ 15.580945][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.580948][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.580952][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.580956][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.580960][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.580965][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.580969][ C2] ? mark_held_locks (kernel/locking/lockdep.c:4326) 
[ 15.580972][ C2] ? note_gp_changes (kernel/rcu/tree.c:1324 (discriminator 1)) 
[ 15.580975][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.580980][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.580983][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.580988][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.580991][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.580994][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.580997][    C2]  </IRQ>
[   15.580998][    C2]  <TASK>
[ 15.581000][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.581003][ C2] RIP: 0010:lock_acquire.part.0 (kernel/locking/lockdep.c:5870) 
[ 15.581006][ C2] Code: ff ff ff 65 0f c1 05 ed 8d 13 05 83 f8 01 0f 85 3e 01 00 00 9c 58 f6 c4 02 0f 85 29 01 00 00 48 85 db 74 01 fb 48 8b 44 24 30 <65> 48 2b 05 5e 51 13 05 0f 85 3a 01 00 00 48 83 c4 38 5b 5d 41 5c
All code
========
   0:	ff                   	(bad)
   1:	ff                   	(bad)
   2:	ff 65 0f             	jmp    *0xf(%rbp)
   5:	c1 05 ed 8d 13 05 83 	roll   $0x83,0x5138ded(%rip)        # 0x5138df9
   c:	f8                   	clc
   d:	01 0f                	add    %ecx,(%rdi)
   f:	85 3e                	test   %edi,(%rsi)
  11:	01 00                	add    %eax,(%rax)
  13:	00 9c 58 f6 c4 02 0f 	add    %bl,0xf02c4f6(%rax,%rbx,2)
  1a:	85 29                	test   %ebp,(%rcx)
  1c:	01 00                	add    %eax,(%rax)
  1e:	00 48 85             	add    %cl,-0x7b(%rax)
  21:	db 74 01 fb          	(bad)  -0x5(%rcx,%rax,1)
  25:	48 8b 44 24 30       	mov    0x30(%rsp),%rax
  2a:*	65 48 2b 05 5e 51 13 	sub    %gs:0x513515e(%rip),%rax        # 0x5135190		<-- trapping instruction
  31:	05 
  32:	0f 85 3a 01 00 00    	jne    0x172
  38:	48 83 c4 38          	add    $0x38,%rsp
  3c:	5b                   	pop    %rbx
  3d:	5d                   	pop    %rbp
  3e:	41 5c                	pop    %r12

Code starting with the faulting instruction
===========================================
   0:	65 48 2b 05 5e 51 13 	sub    %gs:0x513515e(%rip),%rax        # 0x5135166
   7:	05 
   8:	0f 85 3a 01 00 00    	jne    0x148
   e:	48 83 c4 38          	add    $0x38,%rsp
  12:	5b                   	pop    %rbx
  13:	5d                   	pop    %rbp
  14:	41 5c                	pop    %r12
[   15.581009][    C2] RSP: 0018:ffffc900000c7780 EFLAGS: 00000206
[   15.581012][    C2] RAX: f1801e24fbd78300 RBX: 0000000000000200 RCX: 0000000000000001
[   15.581014][    C2] RDX: 0000000000000000 RSI: ffffffff8b472ecb RDI: ffffffff8ac513a0
[   15.581016][    C2] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000001
[   15.581018][    C2] R10: 00000000000000c8 R11: ffffffff8bc220b8 R12: 0000000000000000
[   15.581020][    C2] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8bc220b8
[ 15.581026][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.581028][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.581031][ C2] ? kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.581035][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.581038][ C2] ? kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.581041][ C2] kernfs_put.part.0 (./include/linux/kernfs.h:368 fs/kernfs/dir.c:588) 
[ 15.581045][ C2] kernfs_remove_by_name_ns (fs/kernfs/dir.c:1724 fs/kernfs/dir.c:1715) 
[ 15.581049][ C2] sysfs_unmerge_group (fs/sysfs/group.c:401 (discriminator 3)) 
[ 15.581052][ C2] dpm_sysfs_remove (drivers/base/power/sysfs.c:836) 
[ 15.581055][ C2] device_del (drivers/base/core.c:3857) 
[ 15.581059][ C2] ? __pfx_device_del (drivers/base/core.c:3836) 
[ 15.581062][ C2] ? netdev_unregister_kobject (net/core/net-sysfs.c:2308) 
[ 15.581069][ C2] unregister_netdevice_many_notify (net/core/dev.c:2767 (discriminator 3) net/core/dev.c:12114 (discriminator 3)) 
[ 15.581075][ C2] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:12003) 
[ 15.581078][ C2] ? rtnl_is_locked (net/core/rtnetlink.c:169) 
[ 15.581082][ C2] ? unregister_netdevice_queue (net/core/dev.c:11975) 
[ 15.581086][ C2] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11974) 
[ 15.581091][ C2] ? lockdep_rtnl_is_held (net/core/rtnetlink.c:182) 
[ 15.581093][ C2] ? sit_exit_rtnl_net (net/ipv6/sit.c:1822 (discriminator 1)) 
[ 15.581099][ C2] ops_undo_list (net/core/net_namespace.c:190 net/core/net_namespace.c:249) 
[ 15.581103][ C2] ? __pfx_ops_undo_list (net/core/net_namespace.c:224) 
[ 15.581107][ C2] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:119 kernel/softirq.c:412) 
[ 15.581111][ C2] cleanup_net (net/core/net_namespace.c:688) 
[ 15.581115][ C2] ? __pfx_cleanup_net (net/core/net_namespace.c:652) 
[ 15.581118][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.581122][ C2] process_one_work (kernel/workqueue.c:3238) 
[ 15.581130][ C2] ? __pfx_process_one_work (kernel/workqueue.c:3140) 
[ 15.581136][ C2] ? assign_work (kernel/workqueue.c:1200) 
[ 15.581141][ C2] worker_thread (kernel/workqueue.c:3313 kernel/workqueue.c:3400) 
[ 15.581146][ C2] ? __pfx_worker_thread (kernel/workqueue.c:3346) 
[ 15.581149][ C2] kthread (kernel/kthread.c:464) 
[ 15.581154][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.581157][ C2] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 15.581163][ C2] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 15.581166][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.581169][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.581173][ C2] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 15.581175][ C2] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock