======================================
| [   15.380598][    C2] 1 lock held by swapper/2/0:
| [ 15.380791][ C2] #0: ffffffffb6f749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.381130][    C2]
| [   15.381130][    C2] stack backtrace:
[   15.381370][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.381372][    C2] Call Trace:
[   15.381374][    C2]  <IRQ>
[ 15.381377][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.381383][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.381388][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.381393][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.381399][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.381403][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.381408][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.381411][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.381417][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.381419][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.381423][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.381429][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.381431][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.381435][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.381438][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.381441][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.381444][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.381447][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.381453][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.381456][ 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) 
[ 15.381462][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.381465][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.381468][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.381470][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.381474][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.381477][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.381480][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.381482][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.381484][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.381489][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.381492][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.381495][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.381500][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.381507][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.381510][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.381514][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.381517][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.381521][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.381525][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.381529][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.381532][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.381536][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.381541][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.381545][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.381549][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.381552][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.381554][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.381558][    C2]  </IRQ>
[   15.381559][    C2]  <TASK>
[ 15.381560][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.381563][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.381567][ 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
[   15.381570][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.381573][    C2] RAX: 000000000004edbf RBX: 1ffff92000028fc1 RCX: ffffffffb5f5ba19
[   15.381575][    C2] RDX: 0000000000000000 RSI: ffffffffb6a87785 RDI: ffffffffb6251260
[   15.381577][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.381578][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.381580][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.381584][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.381589][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.381591][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.381594][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.381598][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.381602][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.381607][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.381611][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.381614][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.381618][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.381623][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.397385][    C2] RCU nest depth: 0, expected: 0
| [   15.397573][    C2] INFO: lockdep is turned off.
| [   15.397756][    C2] Preemption disabled at:
| [ 15.397758][ C2] 0x0 
[   15.398212][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.398214][    C2] Call Trace:
[   15.398215][    C2]  <IRQ>
[ 15.398218][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.398224][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.398231][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.398234][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.398238][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.398242][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.398247][ 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) 
[ 15.398252][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.398255][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.398259][ 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) 
[ 15.398264][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.398267][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.398271][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.398275][ 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) 
[ 15.398279][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.398284][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.398287][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.398291][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.398295][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.398299][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.398302][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.398304][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.398306][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.398311][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.398314][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.398317][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.398321][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.398327][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.398331][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.398335][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.398338][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.398342][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.398347][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.398350][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.398354][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.398358][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.398363][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.398366][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.398371][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.398373][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.398376][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.398379][    C2]  </IRQ>
[   15.398380][    C2]  <TASK>
[ 15.398382][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.398385][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.398389][ 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
[   15.398392][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.398395][    C2] RAX: 000000000004edbf RBX: 1ffff92000028fc1 RCX: ffffffffb5f5ba19
[   15.398398][    C2] RDX: 0000000000000000 RSI: ffffffffb6a87785 RDI: ffffffffb6251260
[   15.398400][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.398401][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.398403][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.398407][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.398412][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.398414][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.398416][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.398420][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.398424][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.398429][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.398433][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.398437][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.398440][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.398445][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.108225][    C3] INFO: lockdep is turned off.
| [   17.108395][    C3] Preemption disabled at:
| [ 17.108396][ C3] 0x0 
| [   17.108707][    C3] Tainted: [W]=WARN
[   17.108709][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.108710][    C3] Call Trace:
[   17.108713][    C3]  <IRQ>
[ 17.108715][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.108722][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 17.108729][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.108733][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.108736][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.108741][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.108748][ 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) 
[ 17.108753][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.108756][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.108761][ 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) 
[ 17.108766][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.108769][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.108773][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.108776][ 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) 
[ 17.108782][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.108786][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.108789][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.108794][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.108798][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.108802][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.108805][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.108807][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.108810][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.108814][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.108817][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.108820][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.108825][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.108829][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.108833][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.108838][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.108841][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.108845][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.108848][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.108853][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.108858][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.108863][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.108867][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.108872][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.108874][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.108877][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.108880][    C3]  </IRQ>
[   17.108881][    C3]  <TASK>
[ 17.108883][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.108886][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.108890][ 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
[   17.108893][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   17.108896][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffb5f5ba19
[   17.108898][    C3] RDX: ffffed1006c3667b RSI: ffffffffb62511e0 RDI: ffffffffb378633f
[   17.108900][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c3667a
[   17.108902][    C3] R10: ffff8880361b33d3 R11: ffff888001bdcb58 R12: 0000000000000000
[   17.108904][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.108907][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.108911][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.108915][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.108917][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.108920][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.108924][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.108928][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.108933][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.108937][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.108941][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.108945][ 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