======================================
| [   21.052401][    C3] 1 lock held by swapper/3/0:
| [ 21.052597][ C3] #0: ffffffff8bb774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   21.052944][    C3]
| [   21.052944][    C3] stack backtrace:
[   21.053185][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.053187][    C3] Call Trace:
[   21.053189][    C3]  <IRQ>
[ 21.053192][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 21.053199][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 21.053208][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 21.053215][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 21.053221][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 21.053230][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 21.053235][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 21.053238][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 21.053241][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 21.053246][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 21.053249][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 21.053254][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 21.053258][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 21.053261][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 21.053265][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 21.053269][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 21.053272][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 21.053276][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 21.053281][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 21.053287][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 21.053290][ 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) 
[ 21.053296][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 21.053298][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 21.053302][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 21.053306][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 21.053310][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.053315][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 21.053318][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 21.053321][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.053324][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.053327][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 21.053329][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.053332][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.053336][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 21.053343][ C3] __put_net (net/core/net_namespace.c:732) 
[ 21.053347][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 21.053351][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 21.053353][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 21.053356][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 21.053361][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 21.053364][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 21.053368][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 21.053370][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 21.053375][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 21.053380][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 21.053385][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 21.053388][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 21.053390][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   21.053394][    C3]  </IRQ>
[   21.053395][    C3]  <TASK>
[ 21.053397][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.053400][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 21.053404][ 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
[   21.053407][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000242
[   21.053410][    C3] RAX: 0000000000042a5d RBX: 1ffff9200002afc1 RCX: ffffffff8ab905d9
[   21.053412][    C3] RDX: 0000000000000000 RSI: ffffffff8b68f4e4 RDI: ffffffff8ae53be0
[   21.053414][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   21.053416][    C3] R10: ffff8880361b37d3 R11: ffffffff8b811288 R12: 0000000000000000
[   21.053418][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 21.053422][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 21.053427][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 21.053430][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.053432][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.053436][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 21.053440][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 21.053444][ C3] do_idle (kernel/sched/idle.c:325) 
[ 21.053447][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.053450][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.053453][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 21.053458][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   21.070884][    C3] RCU nest depth: 0, expected: 0
| [   21.071071][    C3] INFO: lockdep is turned off.
| [   21.071280][    C3] Preemption disabled at:
| [ 21.071282][ C3] 0x0 
[   21.071733][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.071736][    C3] Call Trace:
[   21.071738][    C3]  <IRQ>
[ 21.071740][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 21.071749][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 21.071755][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 21.071760][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 21.071763][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 21.071767][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 21.071772][ 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) 
[ 21.071778][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 21.071781][ 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) 
[ 21.071785][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 21.071790][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 21.071793][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 21.071799][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 21.071802][ 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) 
[ 21.071808][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 21.071812][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 21.071817][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 21.071822][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 21.071828][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.071833][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 21.071837][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 21.071841][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.071844][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.071849][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 21.071852][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.071855][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.071859][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 21.071867][ C3] __put_net (net/core/net_namespace.c:732) 
[ 21.071871][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 21.071875][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 21.071878][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 21.071881][ C3] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 21.071887][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 21.071890][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 21.071895][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 21.071898][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 21.071903][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 21.071908][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 21.071913][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 21.071916][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 21.071919][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   21.071922][    C3]  </IRQ>
[   21.071923][    C3]  <TASK>
[ 21.071925][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.071928][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 21.071932][ 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
[   21.071935][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000242
[   21.071939][    C3] RAX: 0000000000042a5d RBX: 1ffff9200002afc1 RCX: ffffffff8ab905d9
[   21.071941][    C3] RDX: 0000000000000000 RSI: ffffffff8b68f4e4 RDI: ffffffff8ae53be0
[   21.071943][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c366fa
[   21.071944][    C3] R10: ffff8880361b37d3 R11: ffffffff8b811288 R12: 0000000000000000
[   21.071946][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 21.071950][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 21.071955][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 21.071957][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.071960][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.071963][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 21.071967][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 21.071972][ C3] do_idle (kernel/sched/idle.c:325) 
[ 21.071975][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.071978][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.071981][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 21.071985][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   25.990642][    C3] INFO: lockdep is turned off.
| [   25.990833][    C3] Preemption disabled at:
| [ 25.990834][ C3] handle_softirqs (kernel/softirq.c:553) 
| [   25.991204][    C3] Tainted: [W]=WARN
[   25.991206][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.991207][    C3] Call Trace:
[   25.991209][    C3]  <TASK>
[ 25.991211][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.991219][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 25.991226][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 25.991231][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 25.991234][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 25.991238][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.991244][ 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) 
[ 25.991250][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 25.991253][ 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) 
[ 25.991256][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 25.991262][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 25.991265][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 25.991271][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 25.991275][ 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) 
[ 25.991280][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.991284][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 25.991287][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 25.991291][ C3] ? kthread (kernel/kthread.c:464) 
[ 25.991294][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 25.991298][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 25.991304][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 25.991308][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 25.991311][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 25.991316][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.991321][ C3] __put_net (net/core/net_namespace.c:732) 
[ 25.991325][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 25.991329][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.991331][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.991334][ C3] ? __schedule (kernel/sched/core.c:6658) 
[ 25.991340][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 25.991344][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.991347][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 25.991354][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 25.991358][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 25.991362][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 25.991366][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 25.991369][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 25.991373][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 25.991377][ C3] kthread (kernel/kthread.c:464) 
[ 25.991379][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 25.991382][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 25.991384][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 25.991388][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.991391][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 25.991394][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 25.991397][ C3] ? __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