======================================
| [   14.417211][    C3] 1 lock held by swapper/3/0:
| [ 14.417400][ C3] #0: ffffffff95574480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.417730][    C3]
| [   14.417730][    C3] stack backtrace:
[   14.417960][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.417963][    C3] Call Trace:
[   14.417964][    C3]  <IRQ>
[ 14.417967][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.417972][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.417978][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.417983][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.417989][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.417993][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.417997][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.418001][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.418006][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.418009][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.418014][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.418021][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.418024][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.418028][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.418031][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.418035][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 14.418038][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.418042][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.418047][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.418049][ 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:2333) 
[ 14.418054][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.418057][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.418060][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.418062][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.418065][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.418069][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.418071][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.418073][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.418076][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.418080][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.418083][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.418086][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.418091][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.418097][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.418101][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.418104][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.418107][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.418111][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.418115][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.418118][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.418121][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.418125][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.418130][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.418133][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.418137][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.418140][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.418142][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.418145][    C3]  </IRQ>
[   14.418146][    C3]  <TASK>
[ 14.418148][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.418150][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.418154][ C3] Code: b0 b8 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 a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   14.418157][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.418161][    C3] RAX: 0000000000043227 RBX: 1ffff9200002afc1 RCX: ffffffff94555a19
[   14.418163][    C3] RDX: 0000000000000000 RSI: ffffffff95085f31 RDI: ffffffff94850ce0
[   14.418165][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   14.418166][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.418168][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.418172][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.418177][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.418179][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.418181][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.418185][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.418189][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.418194][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.418198][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.418201][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.418205][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.418210][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   14.434097][    C3] RCU nest depth: 0, expected: 0
| [   14.434283][    C3] INFO: lockdep is turned off.
| [   14.434455][    C3] Preemption disabled at:
| [ 14.434457][ C3] 0x0 
[   14.434858][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.434860][    C3] Call Trace:
[   14.434862][    C3]  <IRQ>
[ 14.434864][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.434870][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 14.434876][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.434880][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.434882][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.434886][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.434893][ 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) 
[ 14.434897][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.434899][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.434903][ 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) 
[ 14.434907][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.434910][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.434915][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.434918][ 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:2333) 
[ 14.434923][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.434927][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.434930][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.434933][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.434938][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.434942][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.434945][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.434947][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.434949][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.434953][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.434956][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.434959][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.434964][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.434969][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.434972][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.434976][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.434979][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.434982][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.434987][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.434991][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.434995][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.434999][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.435003][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.435006][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.435011][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.435013][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.435015][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.435019][    C3]  </IRQ>
[   14.435020][    C3]  <TASK>
[ 14.435021][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.435024][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.435027][ C3] Code: b0 b8 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 a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   14.435030][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.435033][    C3] RAX: 0000000000043227 RBX: 1ffff9200002afc1 RCX: ffffffff94555a19
[   14.435035][    C3] RDX: 0000000000000000 RSI: ffffffff95085f31 RDI: ffffffff94850ce0
[   14.435037][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   14.435039][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.435040][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.435044][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.435049][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.435052][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.435054][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.435058][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.435062][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.435066][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.435070][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.435074][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.435077][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.435082][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.063607][    C2] INFO: lockdep is turned off.
| [   16.063806][    C2] Preemption disabled at:
| [ 16.063808][ C2] 0x0 
| [   16.064180][    C2] Tainted: [W]=WARN
[   16.064182][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.064184][    C2] Call Trace:
[   16.064187][    C2]  <IRQ>
[ 16.064188][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.064199][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.064207][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.064215][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.064217][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.064223][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.064231][ 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) 
[ 16.064237][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.064239][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.064244][ 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) 
[ 16.064248][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.064251][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.064257][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.064260][ 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:2333) 
[ 16.064267][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.064272][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.064274][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.064279][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.064285][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.064289][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.064292][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.064295][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.064297][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.064303][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.064306][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.064309][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.064315][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.064320][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.064325][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.064329][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.064333][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.064337][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.064340][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.064345][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.064349][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.064354][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.064360][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.064363][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.064368][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.064371][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.064373][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.064376][    C2]  </IRQ>
[   16.064377][    C2]  <TASK>
[ 16.064379][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.064381][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.064386][ C2] Code: b0 b8 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 a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   16.064389][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.064393][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff94555a19
[   16.064395][    C2] RDX: ffffed1006c2667b RSI: ffffffff94850c60 RDI: ffffffff91d84d8f
[   16.064397][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   16.064398][    C2] R10: ffff8880361333d3 R11: ffff888001d5a858 R12: 0000000000000000
[   16.064400][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.064404][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.064407][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.064412][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.064414][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.064416][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.064420][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.064424][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.064429][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.064433][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.064436][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.064440][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
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