======================================
| [   18.716684][    C2] 1 lock held by swapper/2/0:
| [ 18.716959][ C2] #0: ffffffffbc1749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   18.717327][    C2]
| [   18.717327][    C2] stack backtrace:
[   18.717633][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.717636][    C2] Call Trace:
[   18.717640][    C2]  <IRQ>
[ 18.717645][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.717657][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 18.717669][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 18.717677][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 18.717685][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 18.717690][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 18.717694][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 18.717698][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 18.717704][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 18.717706][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 18.717711][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.717716][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 18.717719][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 18.717722][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 18.717726][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 18.717728][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 18.717731][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 18.717736][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.717742][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.717745][ 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) 
[ 18.717752][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.717756][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.717759][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.717763][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.717769][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.717774][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.717777][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.717780][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.717782][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.717788][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.717791][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.717794][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.717800][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.717807][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.717812][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.717816][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.717819][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.717823][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 18.717827][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.717831][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 18.717835][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 18.717839][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.717844][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.717850][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.717858][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.717862][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.717865][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.717871][    C2]  </IRQ>
[   18.717873][    C2]  <TASK>
[ 18.717875][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.717881][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.717887][ 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
[   18.717892][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   18.717897][    C2] RAX: 000000000004825b RBX: 1ffff92000028fc1 RCX: ffffffffbb15ba19
[   18.717901][    C2] RDX: 0000000000000000 RSI: ffffffffbbc87785 RDI: ffffffffbb451260
[   18.717904][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   18.717907][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   18.717910][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 18.717918][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.717927][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.717931][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.717935][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.717941][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.717950][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 18.717958][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.717965][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.717971][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.717977][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 18.717987][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.738042][    C2] RCU nest depth: 0, expected: 0
| [   18.738293][    C2] INFO: lockdep is turned off.
| [   18.738543][    C2] Preemption disabled at:
| [ 18.738546][ C2] 0x0 
[   18.738989][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.738993][    C2] Call Trace:
[   18.738996][    C2]  <IRQ>
[ 18.739001][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.739014][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 18.739026][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.739033][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.739038][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.739046][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.739055][ 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) 
[ 18.739061][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.739064][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.739069][ 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) 
[ 18.739074][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.739077][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.739084][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.739087][ 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) 
[ 18.739094][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.739099][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.739102][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.739107][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.739113][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.739118][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.739121][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.739124][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.739127][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.739133][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.739136][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.739139][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.739145][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.739152][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.739157][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.739161][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.739164][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.739168][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 18.739174][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.739178][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 18.739184][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 18.739187][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.739192][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.739197][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.739202][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.739205][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.739207][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.739211][    C2]  </IRQ>
[   18.739212][    C2]  <TASK>
[ 18.739214][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.739217][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.739222][ 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
[   18.739225][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   18.739229][    C2] RAX: 000000000004825b RBX: 1ffff92000028fc1 RCX: ffffffffbb15ba19
[   18.739232][    C2] RDX: 0000000000000000 RSI: ffffffffbbc87785 RDI: ffffffffbb451260
[   18.739234][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   18.739236][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   18.739238][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 18.739242][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.739247][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.739249][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.739252][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.739256][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.739260][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 18.739265][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.739269][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.739273][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.739277][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 18.739282][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   21.399714][    C3] INFO: lockdep is turned off.
| [   21.399944][    C3] Preemption disabled at:
| [ 21.399946][ C3] 0x0 
| [   21.400334][    C3] Tainted: [W]=WARN
[   21.400336][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   21.400338][    C3] Call Trace:
[   21.400340][    C3]  <IRQ>
[ 21.400343][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 21.400355][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 21.400363][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 21.400369][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 21.400372][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 21.400378][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.400386][ 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) 
[ 21.400391][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 21.400394][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 21.400400][ 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) 
[ 21.400405][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 21.400408][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 21.400414][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 21.400417][ 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) 
[ 21.400424][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.400429][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 21.400432][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 21.400437][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 21.400444][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.400448][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.400451][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.400454][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.400456][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.400462][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 21.400465][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.400468][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.400475][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 21.400480][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 21.400485][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 21.400491][ C3] __put_net (net/core/net_namespace.c:732) 
[ 21.400495][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 21.400499][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 21.400502][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 21.400508][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 21.400512][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 21.400518][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 21.400524][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 21.400528][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 21.400533][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 21.400535][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 21.400538][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   21.400541][    C3]  </IRQ>
[   21.400542][    C3]  <TASK>
[ 21.400544][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 21.400547][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 21.400552][ 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
[   21.400555][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   21.400559][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffbb15ba19
[   21.400561][    C3] RDX: ffffed1006c3667b RSI: ffffffffbb4511e0 RDI: ffffffffb898633f
[   21.400563][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c3667a
[   21.400565][    C3] R10: ffff8880361b33d3 R11: ffff88800a334b58 R12: 0000000000000000
[   21.400567][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 21.400571][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 21.400574][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.400578][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 21.400581][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 21.400583][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 21.400587][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 21.400591][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 21.400597][ C3] do_idle (kernel/sched/idle.c:325) 
[ 21.400601][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 21.400605][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 21.400608][ 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