======================================
| [   17.099128][    C3] 1 lock held by swapper/3/0:
| [ 17.099305][ C3] #0: ffffffff9ab74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   17.099631][    C3]
| [   17.099631][    C3] stack backtrace:
[   17.099863][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.099865][    C3] Call Trace:
[   17.099867][    C3]  <IRQ>
[ 17.099870][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.099877][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 17.099884][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 17.099889][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.099896][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 17.099900][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 17.099905][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 17.099908][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 17.099914][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 17.099917][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.099922][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.099928][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.099932][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.099936][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.099939][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.099942][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 17.099946][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.099951][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.099957][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.099960][ 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) 
[ 17.099967][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.099970][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.099973][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.099976][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.099979][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.099983][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.099986][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.099988][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.099991][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.099996][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.099999][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.100003][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.100009][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.100016][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.100020][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.100024][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.100027][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.100030][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.100034][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.100038][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.100042][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.100046][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.100050][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.100053][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.100058][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.100060][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.100062][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.100066][    C3]  </IRQ>
[   17.100067][    C3]  <TASK>
[ 17.100068][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.100071][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.100076][ 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
[   17.100079][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000242
[   17.100083][    C3] RAX: 0000000000040c57 RBX: 1ffff9200002afc1 RCX: ffffffff99b55a19
[   17.100085][    C3] RDX: 0000000000000000 RSI: ffffffff9a685f31 RDI: ffffffff99e50ce0
[   17.100087][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   17.100089][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   17.100091][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.100095][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.100100][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.100102][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.100104][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.100109][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.100113][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.100118][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.100122][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.100125][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.100128][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.100134][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.115305][    C3] RCU nest depth: 0, expected: 0
| [   17.115492][    C3] INFO: lockdep is turned off.
| [   17.115676][    C3] Preemption disabled at:
| [ 17.115678][ C3] 0x0 
[   17.116011][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.116013][    C3] Call Trace:
[   17.116015][    C3]  <IRQ>
[ 17.116018][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.116027][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 17.116035][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.116039][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.116042][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.116047][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.116055][ 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) 
[ 17.116060][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.116063][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.116068][ 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) 
[ 17.116073][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.116076][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.116082][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.116085][ 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) 
[ 17.116091][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.116096][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.116099][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.116103][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.116109][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.116114][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.116117][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.116119][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.116122][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.116127][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.116130][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.116133][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.116139][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.116146][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.116150][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.116154][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.116157][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.116161][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.116166][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.116170][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.116174][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.116178][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.116182][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.116186][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.116191][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.116193][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.116195][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.116199][    C3]  </IRQ>
[   17.116200][    C3]  <TASK>
[ 17.116201][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.116204][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.116208][ 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
[   17.116211][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000242
[   17.116215][    C3] RAX: 0000000000040c57 RBX: 1ffff9200002afc1 RCX: ffffffff99b55a19
[   17.116217][    C3] RDX: 0000000000000000 RSI: ffffffff9a685f31 RDI: ffffffff99e50ce0
[   17.116219][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   17.116221][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   17.116222][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.116226][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.116231][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.116234][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.116236][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.116240][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.116244][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.116249][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.116252][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.116256][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.116259][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.116264][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   19.836952][    C3] INFO: lockdep is turned off.
| [   19.837130][    C3] Preemption disabled at:
| [ 19.837132][ C3] 0x0 
| [   19.837461][    C3] Tainted: [W]=WARN
[   19.837463][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.837465][    C3] Call Trace:
[   19.837467][    C3]  <IRQ>
[ 19.837469][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.837482][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 19.837490][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 19.837494][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 19.837497][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 19.837502][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.837511][ 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) 
[ 19.837516][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 19.837519][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 19.837525][ 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) 
[ 19.837529][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 19.837532][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 19.837539][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 19.837542][ 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) 
[ 19.837549][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.837554][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 19.837556][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 19.837562][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 19.837567][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.837571][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.837574][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.837577][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.837579][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.837585][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 19.837588][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.837591][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.837597][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 19.837603][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 19.837608][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.837612][ C3] __put_net (net/core/net_namespace.c:732) 
[ 19.837616][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 19.837620][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.837623][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.837628][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 19.837632][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 19.837638][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 19.837644][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 19.837648][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 19.837653][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 19.837656][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 19.837658][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   19.837661][    C3]  </IRQ>
[   19.837662][    C3]  <TASK>
[ 19.837664][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.837667][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.837671][ 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
[   19.837674][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   19.837678][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffff99b55a19
[   19.837680][    C3] RDX: ffffed1006c3667b RSI: ffffffff99e50c60 RDI: ffffffff97384d8f
[   19.837682][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c3667a
[   19.837684][    C3] R10: ffff8880361b33d3 R11: ffffc900001579d8 R12: 0000000000000000
[   19.837686][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 19.837689][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 19.837693][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.837698][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.837700][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.837702][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.837706][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 19.837710][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 19.837716][ C3] do_idle (kernel/sched/idle.c:325) 
[ 19.837720][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.837723][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.837727][ C3] ? __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