======================================
| [   15.478321][    C2] 1 lock held by swapper/2/0:
| [ 15.478520][ C2] #0: ffffffffacd749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.478885][    C2]
| [   15.478885][    C2] stack backtrace:
[   15.479139][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.479141][    C2] Call Trace:
[   15.479143][    C2]  <IRQ>
[ 15.479145][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.479151][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.479156][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.479161][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.479167][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.479172][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.479176][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.479180][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.479185][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.479188][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.479191][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.479196][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.479198][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.479202][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.479205][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.479207][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.479210][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.479213][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.479219][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.479222][ 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) 
[ 15.479227][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.479230][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.479233][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.479235][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.479240][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.479243][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.479246][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.479248][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.479251][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.479255][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.479257][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.479260][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.479265][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.479271][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.479275][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.479279][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.479282][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.479286][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.479290][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.479294][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.479297][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.479301][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.479305][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.479310][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.479314][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.479317][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.479319][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.479323][    C2]  </IRQ>
[   15.479324][    C2]  <TASK>
[ 15.479325][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.479328][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.479332][ 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
[   15.479335][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   15.479338][    C2] RAX: 000000000004754b RBX: 1ffff92000028fc1 RCX: ffffffffabd5ba19
[   15.479340][    C2] RDX: 0000000000000000 RSI: ffffffffac887785 RDI: ffffffffac051260
[   15.479342][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ea667a
[   15.479343][    C2] R10: ffff88802f5333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.479345][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.479349][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.479354][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.479356][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.479359][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.479363][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.479367][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.479372][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.479376][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.479380][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.479383][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.479388][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.496689][    C2] RCU nest depth: 0, expected: 0
| [   15.496887][    C2] INFO: lockdep is turned off.
| [   15.497194][    C2] Preemption disabled at:
| [ 15.497196][ C2] 0x0 
[   15.497556][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.497558][    C2] Call Trace:
[   15.497560][    C2]  <IRQ>
[ 15.497562][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.497569][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.497575][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.497579][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.497582][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.497586][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.497592][ 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) 
[ 15.497597][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.497599][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.497603][ 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) 
[ 15.497608][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.497611][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.497616][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.497619][ 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) 
[ 15.497624][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.497628][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.497631][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.497634][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.497638][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.497641][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.497645][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.497647][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.497650][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.497654][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.497657][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.497661][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.497665][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.497672][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.497675][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.497679][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.497682][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.497686][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.497691][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.497695][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.497698][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.497702][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.497707][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.497711][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.497716][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.497719][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.497721][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.497725][    C2]  </IRQ>
[   15.497726][    C2]  <TASK>
[ 15.497727][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.497730][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.497734][ 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
[   15.497736][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   15.497740][    C2] RAX: 000000000004754b RBX: 1ffff92000028fc1 RCX: ffffffffabd5ba19
[   15.497743][    C2] RDX: 0000000000000000 RSI: ffffffffac887785 RDI: ffffffffac051260
[   15.497745][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005ea667a
[   15.497747][    C2] R10: ffff88802f5333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.497748][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.497752][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.497757][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.497759][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.497762][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.497765][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.497770][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.497775][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.497779][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.497782][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.497786][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.497791][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.195923][    C0] INFO: lockdep is turned off.
| [   17.196130][    C0] Preemption disabled at:
| [ 17.196131][ C0] schedule_preempt_disabled (kernel/sched/core.c:6919) 
| [   17.196607][    C0] Tainted: [W]=WARN
[   17.196608][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.196610][    C0] Call Trace:
[   17.196612][    C0]  <IRQ>
[ 17.196613][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.196619][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 17.196625][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.196629][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.196632][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.196637][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.196643][ C0] ? 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) 
[ 17.196648][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.196651][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.196655][ C0] ? 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) 
[ 17.196660][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.196663][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.196668][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.196671][ C0] ? __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) 
[ 17.196677][ C0] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.196681][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.196684][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.196689][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.196693][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.196697][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[   17.196697][  T220] perl (220) used greatest stack depth: 24768 bytes left
[ 17.196700][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.196703][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.196705][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.196710][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 17.196713][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.196716][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 17.196719][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 17.196725][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.196729][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.196734][ C0] __put_net (net/core/net_namespace.c:732) 
[ 17.196737][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.196741][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.196745][ C0] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.196750][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.196754][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.196759][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.196763][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 17.196768][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.196771][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.196773][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.196776][    C0]  </IRQ>
[   17.196778][    C0]  <TASK>
[ 17.196779][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.196782][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.196786][ C0] 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
[   17.196788][    C0] RSP: 0000:ffffffffaca07df8 EFLAGS: 00000246
[   17.196792][    C0] RAX: 0000000000000000 RBX: 1ffffffff5940fc3 RCX: ffffffffabd5ba19
[   17.196794][    C0] RDX: ffffed1005e8667b RSI: ffffffffac0511e0 RDI: ffffffffa958633f
[   17.196796][    C0] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005e8667a
[   17.196798][    C0] R10: ffff88802f4333d3 R11: ffff888001bdcb58 R12: 0000000000000000
[   17.196800][    C0] R13: ffffffffaca1f240 R14: dffffc0000000000 R15: 0000000000014770
[ 17.196804][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.196807][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.196811][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.196814][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.196816][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.196820][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.196824][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.196831][ C0] do_idle (kernel/sched/idle.c:325) 
[ 17.196835][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.196838][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 17.196841][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 17.196846][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:501) 
[ 17.196850][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:443 (discriminator 17)) 


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
schedule_preempt_disabled:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal