======================================
| [   16.067746][    C2] 1 lock held by swapper/2/0:
| [ 16.068078][ C2] #0: ffffffff9b5774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   16.068670][    C2]
| [   16.068670][    C2] stack backtrace:
[   16.069078][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.069081][    C2] Call Trace:
[   16.069083][    C2]  <IRQ>
[ 16.069087][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.069098][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 16.069106][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 16.069114][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.069121][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 16.069132][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 16.069138][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 16.069144][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 16.069150][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.069157][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 16.069163][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.069171][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.069178][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.069183][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.069191][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.069197][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.069202][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 16.069209][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.069215][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.069227][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.069233][ 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) 
[ 16.069242][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.069247][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.069252][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.069257][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.069265][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.069271][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.069275][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.069280][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.069284][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.069291][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.069295][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.069298][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.069304][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.069316][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.069323][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.069330][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.069335][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.069341][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.069348][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.069354][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.069360][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.069366][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.069374][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.069382][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.069392][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.069397][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.069402][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.069408][    C2]  </IRQ>
[   16.069410][    C2]  <TASK>
[ 16.069412][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.069417][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.069422][ 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
[   16.069426][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.069431][    C2] RAX: 0000000000043f2b RBX: 1ffff92000028fc1 RCX: ffffffff9a5905d9
[   16.069434][    C2] RDX: 0000000000000000 RSI: ffffffff9b08f4e4 RDI: ffffffff9a853be0
[   16.069438][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   16.069441][    C2] R10: ffff8880361337d3 R11: ffffffff9b211288 R12: 0000000000000000
[   16.069444][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.069450][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.069458][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.069462][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.069467][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.069472][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.069479][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.069486][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.069492][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.069497][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.069503][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.069512][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.086896][    C2] RCU nest depth: 0, expected: 0
| [   16.087082][    C2] INFO: lockdep is turned off.
| [   16.087375][    C2] Preemption disabled at:
| [ 16.087377][ C2] 0x0 
[   16.087727][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.087729][    C2] Call Trace:
[   16.087731][    C2]  <IRQ>
[ 16.087733][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.087741][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 16.087747][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.087751][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.087754][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.087758][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.087763][ 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) 
[ 16.087770][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.087773][ 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) 
[ 16.087776][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.087781][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.087785][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.087790][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.087794][ 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) 
[ 16.087799][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.087802][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.087805][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.087809][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.087814][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.087818][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.087821][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.087824][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.087827][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.087830][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.087832][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.087835][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.087838][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.087845][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.087849][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.087853][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.087856][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.087859][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.087865][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.087868][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.087872][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.087875][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.087880][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.087884][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.087890][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.087893][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.087895][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.087899][    C2]  </IRQ>
[   16.087900][    C2]  <TASK>
[ 16.087901][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.087904][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.087908][ 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
[   16.087911][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.087914][    C2] RAX: 0000000000043f2b RBX: 1ffff92000028fc1 RCX: ffffffff9a5905d9
[   16.087916][    C2] RDX: 0000000000000000 RSI: ffffffff9b08f4e4 RDI: ffffffff9a853be0
[   16.087918][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   16.087919][    C2] R10: ffff8880361337d3 R11: ffffffff9b211288 R12: 0000000000000000
[   16.087921][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.087925][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.087930][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.087932][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.087935][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.087938][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.087942][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.087946][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.087950][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.087953][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.087955][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.087960][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.426394][    C0] INFO: lockdep is turned off.
| [   18.426579][    C0] Preemption disabled at:
| [ 18.426581][ C0] handle_softirqs (kernel/softirq.c:553) 
| [   18.426949][    C0] Tainted: [W]=WARN
[   18.426950][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.426952][    C0] Call Trace:
[   18.426954][    C0]  <TASK>
[ 18.426956][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.426963][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 18.426970][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.426975][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.426977][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.426982][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.426987][ C0] ? 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) 
[ 18.426994][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.426997][ C0] ? 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) 
[ 18.427000][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.427005][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.427008][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 18.427014][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 18.427018][ C0] ? __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) 
[ 18.427024][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.427027][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 18.427030][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.427034][ C0] ? kthread (kernel/kthread.c:464) 
[ 18.427037][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.427042][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.427047][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 18.427051][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 18.427055][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.427060][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.427065][ C0] __put_net (net/core/net_namespace.c:732) 
[ 18.427069][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.427073][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.427075][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.427078][ C0] ? __schedule (kernel/sched/core.c:6658) 
[ 18.427086][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.427089][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.427092][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.427100][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.427104][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 18.427108][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.427112][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.427115][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.427118][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.427123][ C0] kthread (kernel/kthread.c:464) 
[ 18.427125][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.427127][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 18.427130][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.427134][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.427136][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.427139][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.427142][ C0] ? __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