======================================
| [   15.264225][    C3] 1 lock held by swapper/3/0:
| [ 15.264427][ C3] #0: ffffffff931749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.264791][    C3]
| [   15.264791][    C3] stack backtrace:
[   15.265047][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.265049][    C3] Call Trace:
[   15.265051][    C3]  <IRQ>
[ 15.265054][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.265061][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.265066][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.265071][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.265077][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.265082][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.265086][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.265090][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.265095][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.265098][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.265101][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.265108][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.265110][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.265113][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.265116][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.265119][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 15.265122][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.265125][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.265132][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.265135][ 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) 
[ 15.265143][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.265146][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.265149][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.265151][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.265156][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.265160][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.265163][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.265166][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.265168][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.265173][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.265176][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.265179][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.265183][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.265189][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.265194][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.265198][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.265201][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.265205][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.265209][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.265213][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.265217][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.265220][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.265225][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.265230][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.265234][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.265237][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.265239][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.265243][    C3]  </IRQ>
[   15.265244][    C3]  <TASK>
[ 15.265245][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.265248][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.265252][ 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
[   15.265255][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   15.265258][    C3] RAX: 000000000004218d RBX: 1ffff9200002afc1 RCX: ffffffff9215ba19
[   15.265260][    C3] RDX: 0000000000000000 RSI: ffffffff92c87785 RDI: ffffffff92451260
[   15.265262][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.265264][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.265265][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.265269][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.265274][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.265277][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.265279][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.265283][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.265287][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.265292][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.265296][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.265300][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.265303][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.265308][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.282417][    C3] RCU nest depth: 0, expected: 0
| [   15.282611][    C3] INFO: lockdep is turned off.
| [   15.282803][    C3] Preemption disabled at:
| [ 15.282805][ C3] 0x0 
[   15.283150][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.283152][    C3] Call Trace:
[   15.283153][    C3]  <IRQ>
[ 15.283155][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.283161][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 15.283168][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.283172][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.283175][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.283180][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.283186][ 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) 
[ 15.283191][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.283193][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.283197][ 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) 
[ 15.283202][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.283205][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.283209][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.283212][ 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) 
[ 15.283216][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.283220][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.283223][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.283227][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.283231][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.283234][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.283237][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.283240][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.283242][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.283246][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.283249][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.283252][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.283259][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.283265][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.283268][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.283272][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.283275][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.283279][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.283283][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.283287][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.283291][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.283295][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.283299][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.283303][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.283308][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.283310][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.283312][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.283316][    C3]  </IRQ>
[   15.283317][    C3]  <TASK>
[ 15.283318][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.283321][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.283325][ 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
[   15.283328][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   15.283331][    C3] RAX: 000000000004218d RBX: 1ffff9200002afc1 RCX: ffffffff9215ba19
[   15.283333][    C3] RDX: 0000000000000000 RSI: ffffffff92c87785 RDI: ffffffff92451260
[   15.283335][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.283336][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.283338][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.283342][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.283346][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.283349][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.283351][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.283355][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.283359][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.283364][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.283368][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.283372][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.283375][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.283380][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.944684][    C2] INFO: lockdep is turned off.
| [   16.944872][    C2] Preemption disabled at:
| [ 16.944874][ C2] 0x0 
| [   16.945221][    C2] Tainted: [W]=WARN
[   16.945222][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.945225][    C2] Call Trace:
[   16.945228][    C2]  <IRQ>
[ 16.945230][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.945240][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.945249][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.945258][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.945261][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.945267][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.945275][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 16.945281][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.945284][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.945289][ C2] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 16.945294][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.945297][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.945303][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.945306][ 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:2366) 
[ 16.945313][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.945318][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.945322][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.945327][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.945333][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.945337][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.945341][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.945343][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.945346][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.945352][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.945355][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.945358][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.945364][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.945369][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.945375][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.945380][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.945385][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.945389][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.945392][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.945397][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.945402][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.945408][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.945414][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.945418][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.945423][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.945426][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.945428][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.945432][    C2]  </IRQ>
[   16.945433][    C2]  <TASK>
[ 16.945434][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.945437][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.945442][ C2] 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
[   16.945445][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.945449][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff9215ba19
[   16.945451][    C2] RDX: ffffed1006c2667b RSI: ffffffff924511e0 RDI: ffffffff8f98633f
[   16.945453][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   16.945454][    C2] R10: ffff8880361333d3 R11: ffffffff95a4d978 R12: 0000000000000000
[   16.945456][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.945460][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.945463][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.945468][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.945470][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.945473][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.945476][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.945481][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.945486][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.945490][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.945494][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.945498][ 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