======================================
| [   15.547724][    C2] 1 lock held by swapper/2/0:
| [ 15.547933][ C2] #0: ffffffffb9d749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.548301][    C2]
| [   15.548301][    C2] stack backtrace:
[   15.548563][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.548566][    C2] Call Trace:
[   15.548568][    C2]  <IRQ>
[ 15.548571][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.548578][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.548583][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.548588][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.548595][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.548600][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.548604][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.548608][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.548613][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.548616][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.548619][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.548626][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.548628][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.548631][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.548634][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.548637][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.548640][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.548643][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.548650][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.548653][ 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) 
[ 15.548660][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.548664][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.548666][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.548669][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.548674][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.548678][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.548681][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.548683][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.548686][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.548690][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.548693][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.548696][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.548702][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.548709][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.548713][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.548717][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.548720][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.548724][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.548729][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.548733][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.548736][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.548740][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.548744][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.548749][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.548754][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.548756][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.548758][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.548762][    C2]  </IRQ>
[   15.548763][    C2]  <TASK>
[ 15.548765][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.548768][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.548772][ 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
[   15.548775][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.548779][    C2] RAX: 000000000003e345 RBX: 1ffff92000028fc1 RCX: ffffffffb8d5ba19
[   15.548781][    C2] RDX: 0000000000000000 RSI: ffffffffb9887785 RDI: ffffffffb9051260
[   15.548783][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.548784][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.548786][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.548790][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.548795][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.548797][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.548800][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.548803][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.548808][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.548813][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.548817][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.548820][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.548824][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.548829][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.566053][    C2] RCU nest depth: 0, expected: 0
| [   15.566369][    C2] INFO: lockdep is turned off.
| [   15.566577][    C2] Preemption disabled at:
| [ 15.566579][ C2] 0x0 
[   15.566968][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.566970][    C2] Call Trace:
[   15.566972][    C2]  <IRQ>
[ 15.566974][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.566982][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.566990][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.566995][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.566998][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.567004][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.567011][ 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) 
[ 15.567016][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.567019][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.567023][ 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) 
[ 15.567028][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.567031][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.567037][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.567040][ 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) 
[ 15.567047][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.567052][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.567055][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.567059][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.567064][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.567069][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.567072][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.567074][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.567077][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.567082][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.567085][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.567089][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.567093][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.567100][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.567104][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.567108][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.567111][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.567115][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.567121][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.567125][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.567129][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.567133][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.567137][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.567141][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.567146][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.567148][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.567151][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.567154][    C2]  </IRQ>
[   15.567155][    C2]  <TASK>
[ 15.567157][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.567159][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.567163][ 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
[   15.567166][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   15.567169][    C2] RAX: 000000000003e345 RBX: 1ffff92000028fc1 RCX: ffffffffb8d5ba19
[   15.567171][    C2] RDX: 0000000000000000 RSI: ffffffffb9887785 RDI: ffffffffb9051260
[   15.567173][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.567174][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.567176][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.567180][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.567185][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.567187][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.567190][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.567193][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.567198][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.567203][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.567207][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.567210][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.567214][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.567219][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.268984][    C1] INFO: lockdep is turned off.
| [   17.269164][    C1] Preemption disabled at:
| [ 17.269165][ C1] 0x0 
| [   17.269493][    C1] Tainted: [W]=WARN
[   17.269495][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.269497][    C1] Call Trace:
[   17.269499][    C1]  <IRQ>
[ 17.269501][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.269512][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 17.269521][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.269527][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.269531][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.269537][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.269546][ C1] ? 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) 
[ 17.269552][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.269555][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.269561][ C1] ? 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) 
[ 17.269565][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.269568][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.269575][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.269578][ C1] ? __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) 
[ 17.269586][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.269592][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.269598][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.269604][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.269610][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.269615][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.269618][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.269620][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.269622][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.269629][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 17.269632][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.269635][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.269641][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.269648][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.269653][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.269658][ C1] __put_net (net/core/net_namespace.c:732) 
[ 17.269662][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.269666][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.269669][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.269674][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.269678][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.269683][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.269690][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.269695][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 17.269700][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.269702][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.269705][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.269708][    C1]  </IRQ>
[   17.269709][    C1]  <TASK>
[ 17.269711][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.269714][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.269718][ C1] 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
[   17.269720][    C1] RSP: 0000:ffffc90000137de8 EFLAGS: 00000246
[   17.269725][    C1] RAX: 0000000000000001 RBX: 1ffff92000026fc1 RCX: ffffffffb8d5ba19
[   17.269727][    C1] RDX: ffffed1006c1667b RSI: ffffffffb90511e0 RDI: ffffffffb658633f
[   17.269729][    C1] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c1667a
[   17.269731][    C1] R10: ffff8880360b33d3 R11: ffff888007ab0558 R12: 0000000000000000
[   17.269732][    C1] R13: ffff888001bf0040 R14: dffffc0000000000 R15: 0000000000000000
[ 17.269736][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.269739][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.269744][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.269746][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.269748][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.269752][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.269756][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.269762][ C1] do_idle (kernel/sched/idle.c:325) 
[ 17.269766][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.269769][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.269773][ C1] ? __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