======================================
| [   16.771246][    C3] 1 lock held by swapper/3/0:
| [ 16.771580][ C3] #0: ffffffffa2374480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   16.772169][    C3]
| [   16.772169][    C3] stack backtrace:
[   16.772587][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.772590][    C3] Call Trace:
[   16.772593][    C3]  <IRQ>
[ 16.772598][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.772607][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 16.772618][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 16.772627][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.772636][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 16.772643][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 16.772649][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 16.772654][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 16.772661][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 16.772666][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.772672][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.772678][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.772682][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.772686][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.772691][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.772695][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 16.772699][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.772703][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.772710][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.772713][ 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) 
[ 16.772719][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.772723][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.772726][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.772730][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.772736][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.772740][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.772743][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.772746][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.772748][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.772754][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.772757][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.772760][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.772766][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.772774][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.772778][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.772782][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.772785][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.772789][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.772793][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.772797][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.772801][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.772805][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.772809][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.772813][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.772818][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.772820][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.772823][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.772826][    C3]  </IRQ>
[   16.772827][    C3]  <TASK>
[ 16.772828][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.772831][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.772836][ 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
[   16.772839][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   16.772843][    C3] RAX: 000000000004efc3 RBX: 1ffff9200002afc1 RCX: ffffffffa1355a19
[   16.772846][    C3] RDX: 0000000000000000 RSI: ffffffffa1e85f31 RDI: ffffffffa1650ce0
[   16.772848][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   16.772850][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   16.772851][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 16.772855][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.772861][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.772863][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.772865][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.772869][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.772873][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.772878][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.772881][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.772885][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.772888][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.772893][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.791165][    C3] RCU nest depth: 0, expected: 0
| [   16.791372][    C3] INFO: lockdep is turned off.
| [   16.791573][    C3] Preemption disabled at:
| [ 16.791575][ C3] 0x0 
[   16.791943][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.791946][    C3] Call Trace:
[   16.791947][    C3]  <IRQ>
[ 16.791950][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.791958][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 16.791965][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.791969][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.791971][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.791977][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.791985][ 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) 
[ 16.791990][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.791992][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.791997][ 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) 
[ 16.792001][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.792004][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.792011][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.792014][ 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) 
[ 16.792020][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.792025][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.792028][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.792032][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.792037][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.792042][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.792045][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.792048][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.792051][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.792056][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.792059][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.792062][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.792067][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.792074][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.792078][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.792081][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.792084][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.792088][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.792093][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.792097][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.792102][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.792105][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.792110][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.792113][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.792118][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.792121][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.792123][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.792126][    C3]  </IRQ>
[   16.792127][    C3]  <TASK>
[ 16.792129][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.792132][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.792136][ 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
[   16.792139][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   16.792142][    C3] RAX: 000000000004efc3 RBX: 1ffff9200002afc1 RCX: ffffffffa1355a19
[   16.792144][    C3] RDX: 0000000000000000 RSI: ffffffffa1e85f31 RDI: ffffffffa1650ce0
[   16.792146][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   16.792147][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   16.792149][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 16.792153][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.792158][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.792160][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.792163][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.792166][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.792170][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.792175][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.792179][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.792183][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.792186][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.792191][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   19.094087][    C2] INFO: lockdep is turned off.
| [   19.094283][    C2] Preemption disabled at:
| [ 19.094285][ C2] 0x0 
| [   19.094647][    C2] Tainted: [W]=WARN
[   19.094648][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.094650][    C2] Call Trace:
[   19.094653][    C2]  <IRQ>
[ 19.094656][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.094668][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 19.094677][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 19.094681][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 19.094684][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 19.094691][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.094699][ 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) 
[ 19.094706][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 19.094708][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 19.094714][ 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) 
[ 19.094718][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 19.094721][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 19.094728][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 19.094731][ 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) 
[ 19.094738][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.094744][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 19.094747][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 19.094752][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 19.094758][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.094763][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.094766][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.094768][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.094771][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.094777][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 19.094780][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.094783][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.094791][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 19.094797][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 19.094803][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.094807][ C2] __put_net (net/core/net_namespace.c:732) 
[ 19.094811][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 19.094815][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.094818][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.094823][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 19.094828][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.094832][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 19.094836][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 19.094841][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 19.094844][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 19.094846][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   19.094849][    C2]  </IRQ>
[   19.094850][    C2]  <TASK>
[ 19.094852][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.094854][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.094858][ 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
[   19.094861][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   19.094865][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffa1355a19
[   19.094867][    C2] RDX: ffffed1006c2667b RSI: ffffffffa1650c60 RDI: ffffffff9eb84d8f
[   19.094869][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   19.094870][    C2] R10: ffff8880361333d3 R11: ffff888001b9cb58 R12: 0000000000000000
[   19.094872][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 19.094876][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 19.094880][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.094884][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.094887][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.094889][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.094892][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 19.094896][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 19.094902][ C2] do_idle (kernel/sched/idle.c:325) 
[ 19.094905][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.094909][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.094912][ 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