======================================
| [   14.631915][    C3] 1 lock held by swapper/3/0:
| [ 14.632097][ C3] #0: ffffffffa8374480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.632418][    C3]
| [   14.632418][    C3] stack backtrace:
[   14.632645][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.632647][    C3] Call Trace:
[   14.632649][    C3]  <IRQ>
[ 14.632651][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.632656][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.632661][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.632666][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.632671][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.632676][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.632680][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.632683][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.632689][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.632692][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.632696][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.632702][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.632705][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.632710][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.632713][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.632716][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 14.632720][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.632723][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.632728][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.632731][ 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) 
[ 14.632736][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.632739][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.632742][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.632744][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.632749][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.632753][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.632756][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.632758][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.632760][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.632764][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.632767][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.632770][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.632775][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.632782][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.632785][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.632789][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.632792][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.632796][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.632800][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.632803][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.632806][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.632810][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.632814][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.632818][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.632822][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.632825][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.632827][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.632830][    C3]  </IRQ>
[   14.632831][    C3]  <TASK>
[ 14.632833][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.632836][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.632840][ 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
[   14.632843][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.632846][    C3] RAX: 00000000000497c9 RBX: 1ffff9200002afc1 RCX: ffffffffa7355a19
[   14.632848][    C3] RDX: 0000000000000000 RSI: ffffffffa7e85f31 RDI: ffffffffa7650ce0
[   14.632850][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ef667a
[   14.632852][    C3] R10: ffff88802f7b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.632853][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.632857][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.632863][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.632865][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.632867][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.632871][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.632875][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.632880][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.632884][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.632887][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.632890][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.632895][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   14.647608][    C3] RCU nest depth: 0, expected: 0
| [   14.647774][    C3] INFO: lockdep is turned off.
| [   14.647948][    C3] Preemption disabled at:
| [ 14.647950][ C3] 0x0 
[   14.648248][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.648250][    C3] Call Trace:
[   14.648251][    C3]  <IRQ>
[ 14.648253][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.648258][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 14.648264][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.648267][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.648270][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.648274][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.648280][ 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) 
[ 14.648284][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.648286][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.648290][ 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) 
[ 14.648294][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.648301][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.648305][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.648308][ 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) 
[ 14.648313][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.648316][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.648319][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.648322][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.648325][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.648328][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.648331][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.648334][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.648336][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.648340][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.648343][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.648346][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.648350][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.648356][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.648358][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.648362][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.648365][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.648369][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.648373][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.648376][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.648380][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.648384][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.648388][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.648392][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.648396][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.648399][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.648401][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.648404][    C3]  </IRQ>
[   14.648406][    C3]  <TASK>
[ 14.648407][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.648410][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.648413][ 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
[   14.648416][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.648419][    C3] RAX: 00000000000497c9 RBX: 1ffff9200002afc1 RCX: ffffffffa7355a19
[   14.648421][    C3] RDX: 0000000000000000 RSI: ffffffffa7e85f31 RDI: ffffffffa7650ce0
[   14.648423][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ef667a
[   14.648424][    C3] R10: ffff88802f7b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.648426][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.648430][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.648435][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.648437][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.648440][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.648443][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.648447][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.648452][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.648456][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.648460][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.648463][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.648468][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.280858][    C2] INFO: lockdep is turned off.
| [   16.281032][    C2] Preemption disabled at:
| [ 16.281034][ C2] 0x0 
| [   16.281372][    C2] Tainted: [W]=WARN
[   16.281374][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.281376][    C2] Call Trace:
[   16.281377][    C2]  <IRQ>
[ 16.281379][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.281387][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.281394][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.281398][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.281400][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.281405][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.281411][ 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) 
[ 16.281416][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.281418][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.281423][ 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) 
[ 16.281427][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.281430][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.281435][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.281438][ C2] ? __sk_destruct (./include/linux/instrumented.h:96 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 ./include/net/net_namespace.h:287 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.281443][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.281448][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.281450][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.281454][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.281459][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.281463][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.281466][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.281468][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.281471][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.281475][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.281478][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.281481][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.281486][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.281490][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.281494][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.281499][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.281502][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.281506][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.281509][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.281514][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.281518][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.281523][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.281528][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.281532][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.281536][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.281539][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.281541][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.281544][    C2]  </IRQ>
[   16.281545][    C2]  <TASK>
[ 16.281547][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.281550][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.281553][ C2] Code: b0 b8 00 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
  36:	00 00 00 
  39:	66 90                	xchg   %ax,%ax
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	66 2e 0f 1f 84 00 00 	cs nopw 0x0(%rax,%rax,1)
   c:	00 00 00 
   f:	66 90                	xchg   %ax,%ax
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   16.281556][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.281560][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffa7355a19
[   16.281562][    C2] RDX: ffffed1005ee667b RSI: ffffffffa7650c60 RDI: ffffffffa4b84d8f
[   16.281564][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005ee667a
[   16.281565][    C2] R10: ffff88802f7333d3 R11: ffff88800c06cb58 R12: 0000000000000000
[   16.281567][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.281571][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.281575][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.281580][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.281582][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.281584][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.281588][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.281592][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.281597][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.281601][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.281605][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.281608][ 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