======================================
| [   17.947205][    C3] 1 lock held by swapper/3/0:
| [ 17.947406][ C3] #0: ffffffffb95749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   17.947767][    C3]
| [   17.947767][    C3] stack backtrace:
[   17.948026][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.948028][    C3] Call Trace:
[   17.948030][    C3]  <IRQ>
[ 17.948032][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.948038][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 17.948043][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 17.948048][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.948054][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 17.948059][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 17.948063][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 17.948067][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 17.948072][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 17.948075][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.948078][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.948084][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.948086][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.948090][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.948093][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.948095][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 17.948098][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.948101][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.948107][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.948110][ 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) 
[ 17.948116][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.948119][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.948122][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.948124][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.948129][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.948132][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.948135][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.948137][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.948140][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.948145][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.948148][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.948151][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.948155][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.948162][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.948165][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.948169][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.948172][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.948176][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.948180][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.948184][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.948188][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.948191][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.948196][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.948200][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.948205][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.948208][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.948210][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.948214][    C3]  </IRQ>
[   17.948215][    C3]  <TASK>
[ 17.948216][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.948219][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.948223][ 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
[   17.948226][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   17.948229][    C3] RAX: 0000000000037aef RBX: 1ffff9200002afc1 RCX: ffffffffb855ba19
[   17.948231][    C3] RDX: 0000000000000000 RSI: ffffffffb9087785 RDI: ffffffffb8851260
[   17.948233][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   17.948235][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   17.948236][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.948240][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.948245][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.948248][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.948250][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.948254][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.948259][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.948264][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.948268][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.948271][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.948275][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.948280][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.965025][    C3] RCU nest depth: 0, expected: 0
| [   17.965221][    C3] INFO: lockdep is turned off.
| [   17.965413][    C3] Preemption disabled at:
| [ 17.965415][ C3] 0x0 
[   17.965759][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.965761][    C3] Call Trace:
[   17.965763][    C3]  <IRQ>
[ 17.965766][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.965773][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 17.965780][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.965783][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.965786][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.965791][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.965797][ 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) 
[ 17.965810][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.965813][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.965817][ 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) 
[ 17.965821][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.965824][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.965829][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.965833][ 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) 
[ 17.965837][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.965841][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.965844][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.965848][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.965852][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.965856][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.965860][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.965862][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.965864][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.965869][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.965872][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.965875][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.965880][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.965885][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.965889][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.965893][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.965896][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.965900][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.965905][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.965909][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.965913][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.965916][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.965921][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.965925][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.965930][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.965932][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.965935][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.965939][    C3]  </IRQ>
[   17.965940][    C3]  <TASK>
[ 17.965941][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.965944][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.965948][ 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
[   17.965951][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   17.965954][    C3] RAX: 0000000000037aef RBX: 1ffff9200002afc1 RCX: ffffffffb855ba19
[   17.965956][    C3] RDX: 0000000000000000 RSI: ffffffffb9087785 RDI: ffffffffb8851260
[   17.965958][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   17.965960][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   17.965962][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.965966][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.965970][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.965973][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.965975][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.965979][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.965983][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.965988][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.965992][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.965996][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.965999][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.966005][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   20.846457][    C2] INFO: lockdep is turned off.
| [   20.846654][    C2] Preemption disabled at:
| [ 20.846656][ C2] 0x0 
| [   20.847039][    C2] Tainted: [W]=WARN
[   20.847040][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.847042][    C2] Call Trace:
[   20.847045][    C2]  <IRQ>
[ 20.847047][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.847055][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 20.847062][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.847067][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.847070][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 20.847074][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.847081][ 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) 
[ 20.847086][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 20.847089][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.847093][ 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) 
[ 20.847098][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.847101][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.847106][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.847109][ 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) 
[ 20.847114][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.847119][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.847122][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.847126][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 20.847131][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.847135][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.847138][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.847141][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.847143][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.847148][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 20.847151][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.847154][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.847159][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 20.847163][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 20.847168][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.847173][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.847177][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 20.847181][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.847185][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.847190][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.847194][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 20.847199][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 20.847204][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.847208][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.847213][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.847215][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.847218][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   20.847221][    C2]  </IRQ>
[   20.847223][    C2]  <TASK>
[ 20.847224][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.847227][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.847232][ 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
[   20.847235][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   20.847239][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffb855ba19
[   20.847241][    C2] RDX: ffffed1006c2667b RSI: ffffffffb88511e0 RDI: ffffffffb5d8633f
[   20.847243][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   20.847244][    C2] R10: ffff8880361333d3 R11: ffff888001eda858 R12: 0000000000000000
[   20.847246][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 20.847250][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 20.847253][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.847258][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.847261][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.847263][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.847267][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 20.847271][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 20.847276][ C2] do_idle (kernel/sched/idle.c:325) 
[ 20.847280][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.847284][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.847288][ 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