======================================
| [   16.245140][    C2] 1 lock held by swapper/2/0:
| [ 16.245347][ C2] #0: ffffffffbbf774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   16.245712][    C2]
| [   16.245712][    C2] stack backtrace:
[   16.245971][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.245973][    C2] Call Trace:
[   16.245977][    C2]  <IRQ>
[ 16.245979][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.245985][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 16.245989][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 16.245993][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.245998][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 16.246004][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 16.246008][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 16.246011][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 16.246014][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.246018][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 16.246021][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.246026][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.246030][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.246033][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.246037][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.246041][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.246044][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 16.246048][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.246051][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.246060][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.246064][ 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:2376) 
[ 16.246073][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.246075][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.246079][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.246082][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.246087][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.246091][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.246094][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.246097][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.246099][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.246103][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.246105][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.246107][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.246111][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.246119][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.246123][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.246127][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.246130][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.246133][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.246137][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.246140][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.246144][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.246147][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.246152][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.246156][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.246162][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.246165][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.246168][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.246171][    C2]  </IRQ>
[   16.246173][    C2]  <TASK>
[ 16.246174][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.246177][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.246181][ C2] Code: 92 b5 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 37 10 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b5 00                	mov    $0x0,%ch
   3:	c3                   	ret
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 83 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	e9 fc 54 02 00       	jmp    0x25501
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   16.246184][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.246189][    C2] RAX: 0000000000045dc3 RBX: 1ffff92000028fc1 RCX: ffffffffbaf905d9
[   16.246191][    C2] RDX: 0000000000000000 RSI: ffffffffbba8f4e4 RDI: ffffffffbb253be0
[   16.246193][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   16.246194][    C2] R10: ffff8880361337d3 R11: ffffffffbbc11288 R12: 0000000000000000
[   16.246196][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.246200][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.246205][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.246208][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.246210][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.246213][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.246217][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.246222][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.246225][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.246228][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.246231][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.246236][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.264193][    C2] RCU nest depth: 0, expected: 0
| [   16.264424][    C2] INFO: lockdep is turned off.
| [   16.264642][    C2] Preemption disabled at:
| [ 16.264644][ C2] 0x0 
[   16.265041][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.265043][    C2] Call Trace:
[   16.265045][    C2]  <IRQ>
[ 16.265047][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.265054][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 16.265063][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.265067][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.265070][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.265074][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.265079][ 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) 
[ 16.265085][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.265087][ 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) 
[ 16.265091][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.265096][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.265099][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.265106][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.265109][ 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:2376) 
[ 16.265115][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.265118][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.265121][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.265125][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.265130][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.265134][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.265137][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.265140][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.265142][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.265145][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.265147][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.265150][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.265153][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.265160][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.265164][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.265168][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.265171][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.265174][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.265179][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.265183][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.265187][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.265190][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.265195][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.265199][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.265205][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.265208][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.265210][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.265214][    C2]  </IRQ>
[   16.265215][    C2]  <TASK>
[ 16.265216][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.265219][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.265223][ C2] Code: 92 b5 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 37 10 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b5 00                	mov    $0x0,%ch
   3:	c3                   	ret
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d 83 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	e9 fc 54 02 00       	jmp    0x25501
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   16.265226][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.265228][    C2] RAX: 0000000000045dc3 RBX: 1ffff92000028fc1 RCX: ffffffffbaf905d9
[   16.265230][    C2] RDX: 0000000000000000 RSI: ffffffffbba8f4e4 RDI: ffffffffbb253be0
[   16.265232][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   16.265234][    C2] R10: ffff8880361337d3 R11: ffffffffbbc11288 R12: 0000000000000000
[   16.265235][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.265239][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.265244][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.265246][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.265249][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.265252][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.265256][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.265260][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.265263][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.265266][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.265269][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.265274][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.582589][    C1] INFO: lockdep is turned off.
| [   18.582756][    C1] Preemption disabled at:
| [ 18.582758][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   18.583110][    C1] Tainted: [W]=WARN
[   18.583112][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.583115][    C1] Call Trace:
[   18.583117][    C1]  <TASK>
[ 18.583119][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.583129][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 18.583138][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.583143][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.583146][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.583152][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.583158][ C1] ? 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) 
[ 18.583165][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.583168][ C1] ? 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) 
[ 18.583171][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.583178][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.583181][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 18.583188][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 18.583192][ C1] ? __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:2376) 
[ 18.583200][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.583204][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 18.583207][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.583212][ C1] ? kthread (kernel/kthread.c:464) 
[ 18.583216][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.583222][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.583229][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 18.583233][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 18.583237][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.583244][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.583249][ C1] __put_net (net/core/net_namespace.c:732) 
[ 18.583253][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.583257][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.583260][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.583263][ C1] ? __schedule (kernel/sched/core.c:6658) 
[ 18.583270][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.583274][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.583276][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.583289][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.583294][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 18.583298][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.583302][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.583305][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.583309][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.583314][ C1] kthread (kernel/kthread.c:464) 
[ 18.583316][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.583318][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 18.583321][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.583325][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.583328][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.583331][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.583333][ C1] ? __pfx_kthread (kernel/kthread.c:413) 


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