======================================
| [   15.645395][    C2] 1 lock held by swapper/2/0:
| [ 15.645605][ C2] #0: ffffffffae3749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.645983][    C2]
| [   15.645983][    C2] stack backtrace:
[   15.646256][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.646258][    C2] Call Trace:
[   15.646260][    C2]  <IRQ>
[ 15.646262][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.646267][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.646272][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.646277][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.646283][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.646288][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.646292][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.646296][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.646301][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.646304][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.646307][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.646312][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.646314][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.646318][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.646321][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.646323][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.646326][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.646329][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.646335][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.646338][ 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) 
[ 15.646343][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.646346][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.646349][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.646351][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.646355][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.646358][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.646361][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.646363][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.646366][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.646370][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.646373][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.646376][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.646381][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.646388][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.646391][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.646395][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.646398][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.646402][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.646406][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.646410][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.646414][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.646417][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.646422][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.646425][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.646430][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.646433][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.646435][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.646438][    C2]  </IRQ>
[   15.646439][    C2]  <TASK>
[ 15.646441][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.646444][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.646448][ 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
[   15.646451][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.646454][    C2] RAX: 0000000000041c21 RBX: 1ffff92000028fc1 RCX: ffffffffad35ba19
[   15.646456][    C2] RDX: 0000000000000000 RSI: ffffffffade87785 RDI: ffffffffad651260
[   15.646458][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.646459][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.646461][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.646465][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.646470][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.646472][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.646474][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.646478][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.646482][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.646487][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.646491][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.646495][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.646498][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.646504][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.664750][    C2] RCU nest depth: 0, expected: 0
| [   15.665012][    C2] INFO: lockdep is turned off.
| [   15.665230][    C2] Preemption disabled at:
| [ 15.665232][ C2] 0x0 
[   15.665734][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.665735][    C2] Call Trace:
[   15.665737][    C2]  <IRQ>
[ 15.665739][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.665745][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.665751][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.665755][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.665758][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.665763][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.665769][ 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) 
[ 15.665774][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.665777][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.665781][ 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) 
[ 15.665785][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.665788][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.665792][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.665796][ 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) 
[ 15.665800][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.665805][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.665808][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.665811][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.665816][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.665819][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.665822][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.665825][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.665827][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.665831][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.665834][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.665837][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.665841][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.665847][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.665850][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.665854][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.665857][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.665861][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.665866][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.665870][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.665874][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.665877][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.665882][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.665886][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.665890][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.665893][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.665895][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.665899][    C2]  </IRQ>
[   15.665900][    C2]  <TASK>
[ 15.665902][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.665905][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.665908][ 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
[   15.665911][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.665914][    C2] RAX: 0000000000041c21 RBX: 1ffff92000028fc1 RCX: ffffffffad35ba19
[   15.665916][    C2] RDX: 0000000000000000 RSI: ffffffffade87785 RDI: ffffffffad651260
[   15.665918][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.665920][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.665922][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.665926][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.665933][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.665935][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.665938][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.665942][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.665946][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.665951][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.665955][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.665958][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.665962][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.665967][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.304327][    C3] INFO: lockdep is turned off.
| [   17.304519][    C3] Preemption disabled at:
| [ 17.304520][ C3] 0x0 
| [   17.304869][    C3] Tainted: [W]=WARN
[   17.304871][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.304873][    C3] Call Trace:
[   17.304875][    C3]  <IRQ>
[ 17.304878][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.304888][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 17.304896][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.304902][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.304905][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.304911][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.304919][ 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) 
[ 17.304925][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.304931][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.304936][ 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) 
[ 17.304941][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.304944][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.304950][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.304954][ 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) 
[ 17.304961][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.304966][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.304969][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.304974][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.304980][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.304984][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.304988][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.304990][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.304993][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.304998][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.305002][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.305005][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.305011][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.305016][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.305022][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.305026][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.305030][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.305034][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.305038][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.305043][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.305047][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.305053][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.305060][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.305064][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.305069][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.305072][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.305074][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.305078][    C3]  </IRQ>
[   17.305079][    C3]  <TASK>
[ 17.305080][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.305083][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.305088][ 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
[   17.305091][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   17.305095][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffad35ba19
[   17.305097][    C3] RDX: ffffed1006c3667b RSI: ffffffffad6511e0 RDI: ffffffffaab8633f
[   17.305099][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c3667a
[   17.305101][    C3] R10: ffff8880361b33d3 R11: ffff888001ef0558 R12: 0000000000000000
[   17.305103][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.305107][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.305110][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.305114][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.305116][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.305119][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.305123][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.305127][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.305133][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.305137][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.305140][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.305144][ 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