======================================
| [   15.008286][    C3] 1 lock held by swapper/3/0:
| [ 15.008485][ C3] #0: ffffffffa3f774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.008837][    C3]
| [   15.008837][    C3] stack backtrace:
[   15.009083][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.009085][    C3] Call Trace:
[   15.009087][    C3]  <IRQ>
[ 15.009089][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.009095][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.009099][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.009104][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.009108][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.009115][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.009118][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.009121][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.009124][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.009128][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.009131][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.009136][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.009140][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.009142][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.009147][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.009150][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.009153][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 15.009157][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.009160][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.009166][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.009170][ C3] ? __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) 
[ 15.009175][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.009178][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.009181][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.009184][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 15.009188][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.009192][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.009195][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.009198][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.009200][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.009204][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.009206][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.009209][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.009212][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.009220][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.009223][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.009227][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.009230][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.009233][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.009237][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.009240][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.009244][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.009247][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.009252][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.009256][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.009261][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.009264][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.009267][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   15.009271][    C3]  </IRQ>
[   15.009272][    C3]  <TASK>
[ 15.009274][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.009276][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.009281][ C3] 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
[   15.009284][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.009287][    C3] RAX: 0000000000047279 RBX: 1ffff9200002afc1 RCX: ffffffffa2f905d9
[   15.009289][    C3] RDX: 0000000000000000 RSI: ffffffffa3a8f4e4 RDI: ffffffffa3253be0
[   15.009291][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   15.009293][    C3] R10: ffff8880361b37d3 R11: ffffffffa3c11288 R12: 0000000000000000
[   15.009294][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 15.009298][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.009303][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.009305][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.009308][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.009311][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.009315][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 15.009319][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.009323][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.009326][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.009328][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.009333][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.025606][    C3] RCU nest depth: 0, expected: 0
| [   15.025801][    C3] INFO: lockdep is turned off.
| [   15.025985][    C3] Preemption disabled at:
| [ 15.025987][ C3] 0x0 
[   15.026315][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.026317][    C3] Call Trace:
[   15.026319][    C3]  <IRQ>
[ 15.026321][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.026328][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 15.026334][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.026338][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.026341][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.026344][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.026349][ C3] ? 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) 
[ 15.026354][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.026357][ C3] ? 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) 
[ 15.026360][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.026365][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.026368][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.026374][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.026377][ C3] ? __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) 
[ 15.026382][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.026385][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.026388][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.026392][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 15.026396][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.026399][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.026403][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.026405][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.026408][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.026411][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.026413][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.026415][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.026418][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.026424][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.026428][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.026432][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.026434][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.026438][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.026443][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.026446][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.026450][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.026453][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.026458][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.026462][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.026467][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.026470][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.026473][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   15.026476][    C3]  </IRQ>
[   15.026478][    C3]  <TASK>
[ 15.026479][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.026482][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.026486][ C3] 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
[   15.026488][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.026491][    C3] RAX: 0000000000047279 RBX: 1ffff9200002afc1 RCX: ffffffffa2f905d9
[   15.026493][    C3] RDX: 0000000000000000 RSI: ffffffffa3a8f4e4 RDI: ffffffffa3253be0
[   15.026494][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   15.026496][    C3] R10: ffff8880361b37d3 R11: ffffffffa3c11288 R12: 0000000000000000
[   15.026498][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 15.026501][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.026506][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.026509][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.026511][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.026514][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.026518][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 15.026522][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.026526][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.026528][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.026531][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.026536][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.703785][    C1] INFO: lockdep is turned off.
| [   16.703964][    C1] Preemption disabled at:
| [ 16.703965][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   16.704339][    C1] Tainted: [W]=WARN
[   16.704341][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.704343][    C1] Call Trace:
[   16.704346][    C1]  <TASK>
[ 16.704348][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.704358][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 16.704366][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.704372][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.704375][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.704381][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.704388][ 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) 
[ 16.704394][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.704397][ 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) 
[ 16.704401][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.704408][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.704411][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.704418][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.704422][ 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) 
[ 16.704429][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.704433][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.704436][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.704442][ C1] ? kthread (kernel/kthread.c:464) 
[ 16.704445][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.704450][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.704458][ 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) 
[ 16.704462][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 16.704465][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.704471][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.704475][ C1] __put_net (net/core/net_namespace.c:732) 
[ 16.704480][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.704484][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.704486][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.704490][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.704498][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.704500][ C1] ? __pfx_tmigr_handle_remote (kernel/time/timer_migration.c:1059) 
[ 16.704505][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.704508][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.704513][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.704518][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 16.704522][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.704526][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.704529][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.704533][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.704537][ C1] kthread (kernel/kthread.c:464) 
[ 16.704540][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.704542][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 16.704544][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 16.704548][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.704551][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.704554][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.704557][ 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