======================================
| [   15.853759][    C3] 1 lock held by swapper/3/0:
| [ 15.853937][ C3] #0: ffffffff95574480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.854258][    C3]
| [   15.854258][    C3] stack backtrace:
[   15.854483][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.854485][    C3] Call Trace:
[   15.854487][    C3]  <IRQ>
[ 15.854489][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.854495][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.854500][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.854505][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.854510][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.854514][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.854518][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.854522][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.854527][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.854531][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.854535][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.854540][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.854543][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.854548][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.854551][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.854554][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 15.854558][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.854561][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.854565][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.854568][ 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) 
[ 15.854574][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.854577][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.854580][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.854582][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.854586][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.854590][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.854593][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.854595][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.854597][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.854602][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.854605][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.854608][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.854613][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.854619][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.854622][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 15.854626][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.854629][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.854633][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.854636][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.854640][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.854643][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.854647][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.854651][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.854655][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.854659][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.854662][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.854664][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.854667][    C3]  </IRQ>
[   15.854668][    C3]  <TASK>
[ 15.854670][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.854672][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.854676][ 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
[   15.854679][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.854683][    C3] RAX: 0000000000046029 RBX: 1ffff9200002afc1 RCX: ffffffff94555a19
[   15.854685][    C3] RDX: 0000000000000000 RSI: ffffffff95085f31 RDI: ffffffff94850ce0
[   15.854687][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.854688][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.854690][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.854694][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.854699][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.854701][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.854703][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.854707][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.854711][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.854716][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.854720][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.854723][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.854726][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.854731][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.870006][    C3] RCU nest depth: 0, expected: 0
| [   15.870171][    C3] INFO: lockdep is turned off.
| [   15.870333][    C3] Preemption disabled at:
| [ 15.870335][ C3] 0x0 
[   15.870735][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.870737][    C3] Call Trace:
[   15.870738][    C3]  <IRQ>
[ 15.870740][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.870747][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 15.870752][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.870756][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.870758][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.870762][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.870768][ 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) 
[ 15.870772][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.870775][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.870778][ 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) 
[ 15.870782][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.870785][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.870789][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.870792][ 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) 
[ 15.870797][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.870800][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.870803][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.870807][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.870811][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.870815][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.870818][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.870820][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.870822][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.870827][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.870830][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.870833][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.870837][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.870842][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.870845][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 15.870849][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.870852][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.870856][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.870860][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.870864][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.870867][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.870871][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.870875][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.870879][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.870883][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.870886][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.870888][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.870891][    C3]  </IRQ>
[   15.870892][    C3]  <TASK>
[ 15.870894][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.870896][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.870900][ 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
[   15.870902][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.870906][    C3] RAX: 0000000000046029 RBX: 1ffff9200002afc1 RCX: ffffffff94555a19
[   15.870908][    C3] RDX: 0000000000000000 RSI: ffffffff95085f31 RDI: ffffffff94850ce0
[   15.870909][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.870911][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.870912][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.870916][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.870921][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.870924][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.870926][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.870930][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.870934][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.870938][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.870942][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.870946][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.870949][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.870954][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.026073][    C2] INFO: lockdep is turned off.
| [   18.026276][    C2] Preemption disabled at:
| [ 18.026278][ C2] 0x0 
| [   18.026608][    C2] Tainted: [W]=WARN
[   18.026610][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.026612][    C2] Call Trace:
[   18.026613][    C2]  <IRQ>
[ 18.026615][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.026625][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 18.026634][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.026641][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.026646][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.026653][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.026661][ 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) 
[ 18.026665][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.026668][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.026672][ 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) 
[ 18.026676][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.026679][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.026684][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.026687][ 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) 
[ 18.026693][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.026697][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.026700][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.026703][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.026708][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.026716][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.026719][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.026721][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.026723][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.026728][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.026731][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.026734][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.026739][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.026743][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.026747][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.026752][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.026755][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 18.026759][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.026762][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.026767][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.026770][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.026775][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.026780][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.026784][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.026788][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.026791][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.026793][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.026796][    C2]  </IRQ>
[   18.026797][    C2]  <TASK>
[ 18.026799][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.026802][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.026805][ 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
[   18.026808][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   18.026812][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff94555a19
[   18.026814][    C2] RDX: ffffed1006c2667b RSI: ffffffff94850c60 RDI: ffffffff91d84d8f
[   18.026816][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   18.026818][    C2] R10: ffff8880361333d3 R11: ffffffff97e4fd38 R12: 0000000000000000
[   18.026820][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 18.026824][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.026828][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.026832][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.026835][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.026837][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.026840][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.026845][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 18.026850][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.026853][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.026857][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.026860][ 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