======================================
| [   19.020488][    C3] 1 lock held by swapper/3/0:
| [ 19.020689][ C3] #0: ffffffffbbd749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   19.021063][    C3]
| [   19.021063][    C3] stack backtrace:
[   19.021321][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.021323][    C3] Call Trace:
[   19.021325][    C3]  <IRQ>
[ 19.021328][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.021334][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 19.021340][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 19.021345][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 19.021351][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 19.021355][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 19.021359][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 19.021363][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 19.021369][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 19.021371][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 19.021375][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.021381][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 19.021383][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 19.021386][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 19.021391][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 19.021393][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 19.021397][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 19.021400][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 19.021406][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 19.021409][ 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:2366) 
[ 19.021414][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 19.021417][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 19.021420][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 19.021423][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 19.021427][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.021431][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.021435][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.021437][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.021439][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.021445][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 19.021448][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.021451][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.021456][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 19.021462][ C3] __put_net (net/core/net_namespace.c:732) 
[ 19.021466][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 19.021470][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.021473][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 19.021477][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 19.021481][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 19.021484][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 19.021488][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 19.021492][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 19.021496][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 19.021500][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 19.021505][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 19.021508][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 19.021510][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   19.021513][    C3]  </IRQ>
[   19.021515][    C3]  <TASK>
[ 19.021516][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.021519][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.021523][ C3] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 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:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  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
[   19.021526][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000246
[   19.021531][    C3] RAX: 000000000004451b RBX: 1ffff9200002afc1 RCX: ffffffffbad5ba19
[   19.021534][    C3] RDX: 0000000000000000 RSI: ffffffffbb887785 RDI: ffffffffbb051260
[   19.021537][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   19.021539][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   19.021541][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 19.021547][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 19.021555][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.021558][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.021562][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.021568][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 19.021575][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 19.021583][ C3] do_idle (kernel/sched/idle.c:325) 
[ 19.021589][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.021594][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.021599][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 19.021607][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   19.044831][    C3] RCU nest depth: 0, expected: 0
| [   19.045021][    C3] INFO: lockdep is turned off.
| [   19.045195][    C3] Preemption disabled at:
| [ 19.045197][ C3] 0x0 
[   19.045522][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.045525][    C3] Call Trace:
[   19.045526][    C3]  <IRQ>
[ 19.045529][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.045537][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 19.045544][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 19.045549][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 19.045552][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 19.045556][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 19.045563][ 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) 
[ 19.045567][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 19.045570][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 19.045575][ 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) 
[ 19.045579][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 19.045582][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 19.045588][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 19.045591][ 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:2366) 
[ 19.045597][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 19.045601][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 19.045604][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 19.045608][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 19.045613][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.045616][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.045620][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.045622][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.045624][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.045629][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 19.045632][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.045635][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.045640][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 19.045646][ C3] __put_net (net/core/net_namespace.c:732) 
[ 19.045650][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 19.045654][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 19.045657][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 19.045660][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 19.045666][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 19.045670][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 19.045674][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 19.045678][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 19.045682][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 19.045686][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 19.045691][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 19.045694][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 19.045696][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   19.045700][    C3]  </IRQ>
[   19.045701][    C3]  <TASK>
[ 19.045702][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 19.045705][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 19.045710][ C3] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 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:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  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
[   19.045714][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000246
[   19.045720][    C3] RAX: 000000000004451b RBX: 1ffff9200002afc1 RCX: ffffffffbad5ba19
[   19.045723][    C3] RDX: 0000000000000000 RSI: ffffffffbb887785 RDI: ffffffffbb051260
[   19.045726][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   19.045728][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   19.045731][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 19.045738][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 19.045745][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 19.045747][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 19.045750][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 19.045754][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 19.045759][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 19.045764][ C3] do_idle (kernel/sched/idle.c:325) 
[ 19.045768][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 19.045772][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 19.045775][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 19.045780][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   21.475946][    C3] INFO: lockdep is turned off.
| [   21.476161][    C3] Preemption disabled at:
| [ 21.476163][ C3] 0x0 
| [   21.476559][    C3] Tainted: [W]=WARN
[   21.476560][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.476562][    C3] Call Trace:
[   21.476564][    C3]  <IRQ>
[ 21.476566][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 21.476576][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 21.476583][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 21.476588][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 21.476591][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 21.476595][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.476602][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 21.476608][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 21.476611][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 21.476615][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 21.476620][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 21.476623][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 21.476628][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 21.476632][ 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:2366) 
[ 21.476637][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.476641][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 21.476644][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 21.476648][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 21.476653][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.476657][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.476660][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.476663][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.476665][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.476670][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 21.476673][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.476676][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.476680][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 21.476685][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 21.476689][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.476694][ C3] __put_net (net/core/net_namespace.c:732) 
[ 21.476698][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 21.476702][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 21.476705][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.476710][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 21.476714][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 21.476719][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 21.476724][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 21.476729][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 21.476733][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 21.476736][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 21.476738][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   21.476742][    C3]  </IRQ>
[   21.476743][    C3]  <TASK>
[ 21.476744][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.476747][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.476751][ C3] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 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:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  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
[   21.476754][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   21.476758][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffbad5ba19
[   21.476760][    C3] RDX: ffffed1006c3667b RSI: ffffffffbb0511e0 RDI: ffffffffb858633f
[   21.476762][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c3667a
[   21.476764][    C3] R10: ffff8880361b33d3 R11: ffff888008becb58 R12: 0000000000000000
[   21.476765][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 21.476769][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 21.476772][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.476777][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.476779][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.476782][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.476786][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 21.476790][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 21.476795][ C3] do_idle (kernel/sched/idle.c:325) 
[ 21.476800][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.476803][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.476807][ 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