======================================
| [   15.628200][    C3] 1 lock held by swapper/3/0:
| [ 15.628416][ C3] #0: ffffffff9ed749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.628770][    C3]
| [   15.628770][    C3] stack backtrace:
[   15.629023][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.629025][    C3] Call Trace:
[   15.629027][    C3]  <IRQ>
[ 15.629029][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.629034][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.629040][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.629045][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.629050][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.629055][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.629059][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.629063][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.629068][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.629071][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.629074][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.629079][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.629081][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.629084][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.629087][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.629090][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 15.629093][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.629096][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.629101][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.629104][ 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) 
[ 15.629109][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.629112][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.629115][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.629118][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.629121][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.629124][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.629128][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.629130][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.629133][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.629137][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.629140][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.629143][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.629147][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.629153][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.629157][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.629161][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.629164][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.629168][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.629172][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.629176][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.629179][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.629183][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.629187][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.629191][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.629196][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.629198][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.629201][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.629204][    C3]  </IRQ>
[   15.629205][    C3]  <TASK>
[ 15.629206][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.629209][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.629213][ 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
[   15.629216][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.629219][    C3] RAX: 000000000003b0b9 RBX: 1ffff9200002afc1 RCX: ffffffff9dd5ba19
[   15.629221][    C3] RDX: 0000000000000000 RSI: ffffffff9e887785 RDI: ffffffff9e051260
[   15.629223][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005eb667a
[   15.629224][    C3] R10: ffff88802f5b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.629226][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.629230][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.629235][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.629237][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.629239][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.629243][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.629247][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.629253][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.629257][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.629260][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.629264][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.629269][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.645746][    C3] RCU nest depth: 0, expected: 0
| [   15.645928][    C3] INFO: lockdep is turned off.
| [   15.646111][    C3] Preemption disabled at:
| [ 15.646113][ C3] 0x0 
[   15.646426][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.646428][    C3] Call Trace:
[   15.646429][    C3]  <IRQ>
[ 15.646431][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.646437][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 15.646443][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.646447][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.646450][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.646454][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.646459][ 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) 
[ 15.646464][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.646466][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.646470][ 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) 
[ 15.646474][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.646477][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.646482][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.646484][ 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) 
[ 15.646489][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.646492][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.646495][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.646498][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.646502][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.646506][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.646509][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.646511][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.646513][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.646517][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.646521][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.646524][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.646528][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.646533][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.646537][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.646543][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.646546][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.646550][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.646554][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.646558][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.646562][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.646566][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.646571][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.646575][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.646579][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.646582][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.646584][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.646588][    C3]  </IRQ>
[   15.646589][    C3]  <TASK>
[ 15.646590][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.646593][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.646597][ 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
[   15.646600][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.646602][    C3] RAX: 000000000003b0b9 RBX: 1ffff9200002afc1 RCX: ffffffff9dd5ba19
[   15.646605][    C3] RDX: 0000000000000000 RSI: ffffffff9e887785 RDI: ffffffff9e051260
[   15.646607][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005eb667a
[   15.646609][    C3] R10: ffff88802f5b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.646610][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.646614][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.646619][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.646621][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.646623][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.646627][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.646632][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.646636][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.646640][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.646644][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.646648][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.646653][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.328898][    C2] INFO: lockdep is turned off.
| [   17.329119][    C2] Preemption disabled at:
| [ 17.329121][ C2] 0x0 
| [   17.329500][    C2] Tainted: [W]=WARN
[   17.329501][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.329504][    C2] Call Trace:
[   17.329506][    C2]  <IRQ>
[ 17.329508][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.329519][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 17.329527][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.329533][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.329536][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.329545][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.329553][ 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) 
[ 17.329559][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.329562][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.329567][ 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) 
[ 17.329572][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.329575][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.329581][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.329584][ 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) 
[ 17.329591][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.329596][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.329599][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.329605][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.329610][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.329615][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.329618][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.329621][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.329623][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.329629][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 17.329632][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.329635][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.329641][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.329647][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.329652][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.329657][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.329662][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.329666][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.329669][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.329674][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.329679][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.329684][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.329691][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.329695][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.329700][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.329703][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.329705][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.329709][    C2]  </IRQ>
[   17.329710][    C2]  <TASK>
[ 17.329711][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.329714][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.329719][ 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
[   17.329722][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   17.329726][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff9dd5ba19
[   17.329728][    C2] RDX: ffffed1005ea667b RSI: ffffffff9e0511e0 RDI: ffffffff9b58633f
[   17.329730][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005ea667a
[   17.329732][    C2] R10: ffff88802f5333d3 R11: ffffffffa17348d0 R12: 0000000000000000
[   17.329734][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 17.329737][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.329741][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.329745][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.329747][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.329750][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.329754][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.329758][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.329763][ C2] do_idle (kernel/sched/idle.c:325) 
[ 17.329767][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.329771][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.329775][ 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