======================================
| [   20.526164][    C2] 1 lock held by swapper/2/0:
| [ 20.526369][ C2] #0: ffffffff86574480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   20.526739][    C2]
| [   20.526739][    C2] stack backtrace:
[   20.527001][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.527003][    C2] Call Trace:
[   20.527005][    C2]  <IRQ>
[ 20.527009][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.527015][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 20.527022][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 20.527027][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.527032][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 20.527036][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 20.527040][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 20.527044][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 20.527049][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 20.527053][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.527058][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.527064][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 20.527067][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.527071][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.527075][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 20.527078][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 20.527082][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.527086][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.527090][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.527093][ 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:2333) 
[ 20.527097][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.527100][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.527103][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.527106][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 20.527109][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.527113][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.527116][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.527118][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.527120][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.527124][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 20.527127][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.527130][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.527135][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 20.527141][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.527145][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 20.527148][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.527151][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.527155][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 20.527159][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.527162][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 20.527166][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 20.527169][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 20.527174][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.527177][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.527181][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.527184][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.527186][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   20.527190][    C2]  </IRQ>
[   20.527191][    C2]  <TASK>
[ 20.527192][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.527195][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.527199][ C2] Code: b0 b8 00 c3 cc cc cc cc 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 a3 d0 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:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  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
[   20.527202][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   20.527205][    C2] RAX: 000000000004b18f RBX: 1ffff92000028fc1 RCX: ffffffff85555a19
[   20.527207][    C2] RDX: 0000000000000000 RSI: ffffffff86085f31 RDI: ffffffff85850ce0
[   20.527209][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   20.527210][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   20.527212][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 20.527216][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 20.527221][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.527223][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.527226][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.527229][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 20.527233][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 20.527238][ C2] do_idle (kernel/sched/idle.c:325) 
[ 20.527242][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.527245][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.527249][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 20.527254][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   20.544810][    C2] RCU nest depth: 0, expected: 0
| [   20.545020][    C2] INFO: lockdep is turned off.
| [   20.545233][    C2] Preemption disabled at:
| [ 20.545235][ C2] 0x0 
[   20.545618][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.545620][    C2] Call Trace:
[   20.545622][    C2]  <IRQ>
[ 20.545624][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.545632][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 20.545639][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.545643][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.545645][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 20.545650][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.545656][ 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) 
[ 20.545661][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 20.545663][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.545668][ 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) 
[ 20.545673][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.545675][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.545681][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.545684][ 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:2333) 
[ 20.545689][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.545693][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.545697][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.545701][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 20.545706][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.545710][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.545713][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.545715][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.545718][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.545722][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 20.545725][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.545728][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.545733][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 20.545740][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.545743][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 20.545747][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.545750][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.545753][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 20.545758][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.545762][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 20.545765][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 20.545769][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 20.545773][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.545777][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.545782][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.545784][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.545786][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   20.545790][    C2]  </IRQ>
[   20.545791][    C2]  <TASK>
[ 20.545792][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.545795][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 20.545799][ C2] Code: b0 b8 00 c3 cc cc cc cc 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 a3 d0 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:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  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
[   20.545802][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   20.545805][    C2] RAX: 000000000004b18f RBX: 1ffff92000028fc1 RCX: ffffffff85555a19
[   20.545808][    C2] RDX: 0000000000000000 RSI: ffffffff86085f31 RDI: ffffffff85850ce0
[   20.545809][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   20.545811][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   20.545812][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 20.545816][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 20.545822][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 20.545824][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 20.545826][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 20.545830][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 20.545834][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 20.545839][ C2] do_idle (kernel/sched/idle.c:325) 
[ 20.545843][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 20.545847][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 20.545850][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 20.545855][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   25.625625][    C2] INFO: lockdep is turned off.
| [   25.625830][    C2] Preemption disabled at:
| [ 25.625832][ C2] 0x0 
| [   25.626247][    C2] Tainted: [W]=WARN
[   25.626248][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.626250][    C2] Call Trace:
[   25.626252][    C2]  <IRQ>
[ 25.626255][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.626264][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 25.626271][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 25.626277][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 25.626281][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 25.626287][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 25.626295][ 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) 
[ 25.626300][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 25.626303][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 25.626307][ 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) 
[ 25.626311][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 25.626314][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 25.626319][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 25.626322][ 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:2333) 
[ 25.626326][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 25.626330][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 25.626333][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 25.626336][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 25.626341][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.626344][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 25.626347][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 25.626349][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.626352][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.626358][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 25.626362][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.626367][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.626374][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 25.626379][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 25.626382][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 25.626387][ C2] __put_net (net/core/net_namespace.c:732) 
[ 25.626391][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 25.626394][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 25.626397][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 25.626403][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 25.626409][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 25.626415][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 25.626424][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 25.626428][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 25.626432][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 25.626435][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 25.626437][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   25.626440][    C2]  </IRQ>
[   25.626441][    C2]  <TASK>
[ 25.626443][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.626446][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 25.626450][ C2] Code: b0 b8 00 c3 cc cc cc cc 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 a3 d0 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:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  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
[   25.626452][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   25.626456][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff85555a19
[   25.626458][    C2] RDX: ffffed1006c2667b RSI: ffffffff85850c60 RDI: ffffffff82d84d8f
[   25.626460][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   25.626462][    C2] R10: ffff8880361333d3 R11: ffff888008cca858 R12: 0000000000000000
[   25.626463][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 25.626467][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 25.626471][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.626475][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 25.626477][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.626480][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.626483][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 25.626494][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 25.626502][ C2] do_idle (kernel/sched/idle.c:325) 
[ 25.626508][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.626511][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.626515][ 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