======================================
| [   15.487197][    C3] 1 lock held by swapper/3/0:
| [ 15.487398][ C3] #0: ffffffffbc7749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.487754][    C3]
| [   15.487754][    C3] stack backtrace:
[   15.488005][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.488007][    C3] Call Trace:
[   15.488009][    C3]  <IRQ>
[ 15.488012][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.488018][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.488023][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.488028][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.488034][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.488039][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.488043][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.488047][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.488052][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.488055][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.488058][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.488063][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.488065][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.488069][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.488072][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.488074][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 15.488077][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.488080][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.488085][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.488089][ 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) 
[ 15.488094][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.488097][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.488100][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.488102][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.488106][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.488110][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.488113][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.488115][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.488118][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.488123][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.488126][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.488129][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.488134][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.488140][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.488144][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.488147][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.488151][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.488154][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.488159][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.488162][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.488166][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.488170][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.488175][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.488178][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.488183][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.488186][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.488188][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.488191][    C3]  </IRQ>
[   15.488192][    C3]  <TASK>
[ 15.488194][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.488197][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.488201][ 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
[   15.488204][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.488207][    C3] RAX: 000000000004a1b3 RBX: 1ffff9200002afc1 RCX: ffffffffbb75ba19
[   15.488209][    C3] RDX: 0000000000000000 RSI: ffffffffbc287785 RDI: ffffffffbba51260
[   15.488211][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.488213][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.488214][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.488218][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.488223][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.488225][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.488228][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.488232][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.488236][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.488241][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.488245][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.488249][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.488252][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.488258][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.504359][    C3] RCU nest depth: 0, expected: 0
| [   15.504532][    C3] INFO: lockdep is turned off.
| [   15.504723][    C3] Preemption disabled at:
| [ 15.504724][ C3] 0x0 
[   15.505037][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.505038][    C3] Call Trace:
[   15.505040][    C3]  <IRQ>
[ 15.505041][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.505048][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 15.505054][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.505058][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.505061][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.505065][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.505070][ 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) 
[ 15.505075][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.505077][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.505081][ 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) 
[ 15.505086][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.505089][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.505093][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.505097][ 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) 
[ 15.505100][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.505104][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.505107][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.505110][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.505114][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.505118][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.505121][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.505123][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.505126][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.505130][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.505133][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.505136][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.505140][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.505145][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.505149][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.505153][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.505156][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.505160][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.505164][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.505168][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.505172][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.505176][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.505181][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.505185][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.505189][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.505192][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.505194][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.505198][    C3]  </IRQ>
[   15.505199][    C3]  <TASK>
[ 15.505200][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.505203][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.505207][ 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
[   15.505209][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   15.505212][    C3] RAX: 000000000004a1b3 RBX: 1ffff9200002afc1 RCX: ffffffffbb75ba19
[   15.505214][    C3] RDX: 0000000000000000 RSI: ffffffffbc287785 RDI: ffffffffbba51260
[   15.505216][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.505218][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.505220][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.505223][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.505228][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.505230][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.505233][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.505237][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.505241][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.505246][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.505250][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.505254][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.505257][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.505262][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.487114][    C2] INFO: lockdep is turned off.
| [   17.487310][    C2] Preemption disabled at:
| [ 17.487312][ C2] 0x0 
| [   17.487677][    C2] Tainted: [W]=WARN
[   17.487678][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.487681][    C2] Call Trace:
[   17.487683][    C2]  <IRQ>
[ 17.487685][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.487696][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 17.487703][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.487709][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.487716][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.487721][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.487729][ 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) 
[ 17.487735][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.487738][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.487744][ 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) 
[ 17.487748][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.487751][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.487758][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.487761][ 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) 
[ 17.487768][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.487773][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.487776][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.487781][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.487787][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.487792][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.487795][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.487798][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.487800][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.487806][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 17.487809][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.487813][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.487819][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.487825][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.487830][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.487835][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.487839][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.487843][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.487846][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.487851][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.487856][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.487862][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.487868][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.487873][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.487878][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.487880][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.487883][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.487887][    C2]  </IRQ>
[   17.487888][    C2]  <TASK>
[ 17.487889][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.487892][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.487897][ 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
[   17.487900][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   17.487904][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffbb75ba19
[   17.487906][    C2] RDX: ffffed1006c2667b RSI: ffffffffbba511e0 RDI: ffffffffb8f8633f
[   17.487908][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   17.487910][    C2] R10: ffff8880361333d3 R11: ffffffffbf08dc98 R12: 0000000000000000
[   17.487912][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 17.487916][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.487919][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.487923][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.487926][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.487928][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.487932][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.487937][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.487943][ C2] do_idle (kernel/sched/idle.c:325) 
[ 17.487947][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.487951][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.487954][ 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