======================================
| [   15.024833][    C2] 1 lock held by swapper/2/0:
| [ 15.025024][ C2] #0: ffffffff90b74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.025359][    C2]
| [   15.025359][    C2] stack backtrace:
[   15.025596][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.025599][    C2] Call Trace:
[   15.025601][    C2]  <IRQ>
[ 15.025603][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.025610][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.025616][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.025620][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.025627][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.025632][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.025636][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.025639][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.025645][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.025649][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.025653][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.025659][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.025663][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.025667][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.025670][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.025673][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.025677][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.025680][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.025686][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.025689][ 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) 
[ 15.025696][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.025699][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.025702][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.025705][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.025710][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.025714][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.025718][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.025720][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.025722][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.025726][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.025729][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.025732][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.025736][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.025743][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.025748][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 15.025751][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.025754][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.025758][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.025762][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.025766][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.025770][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.025773][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.025778][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.025781][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.025786][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.025788][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.025790][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.025794][    C2]  </IRQ>
[   15.025795][    C2]  <TASK>
[ 15.025796][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.025799][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.025803][ 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
[   15.025807][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000242
[   15.025810][    C2] RAX: 0000000000040e97 RBX: 1ffff92000028fc1 RCX: ffffffff8fb55a19
[   15.025812][    C2] RDX: 0000000000000000 RSI: ffffffff90685f31 RDI: ffffffff8fe50ce0
[   15.025814][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.025816][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.025818][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.025822][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.025827][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.025829][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.025832][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.025835][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.025840][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.025844][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.025848][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.025851][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.025855][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.025860][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.041537][    C2] RCU nest depth: 0, expected: 0
| [   15.041734][    C2] INFO: lockdep is turned off.
| [   15.041922][    C2] Preemption disabled at:
| [ 15.041924][ C2] 0x0 
[   15.042270][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.042272][    C2] Call Trace:
[   15.042274][    C2]  <IRQ>
[ 15.042276][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.042283][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.042291][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.042296][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.042298][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.042303][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.042310][ 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) 
[ 15.042315][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.042318][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.042323][ 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) 
[ 15.042327][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.042330][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.042335][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.042338][ 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) 
[ 15.042344][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.042348][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.042351][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.042356][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.042361][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.042365][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.042368][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.042371][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.042374][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.042379][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.042382][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.042385][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.042390][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.042396][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.042401][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 15.042405][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.042408][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.042412][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.042417][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.042421][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.042425][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.042429][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.042434][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.042437][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.042442][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.042445][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.042447][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.042451][    C2]  </IRQ>
[   15.042452][    C2]  <TASK>
[ 15.042454][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.042456][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.042460][ 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
[   15.042466][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000242
[   15.042469][    C2] RAX: 0000000000040e97 RBX: 1ffff92000028fc1 RCX: ffffffff8fb55a19
[   15.042471][    C2] RDX: 0000000000000000 RSI: ffffffff90685f31 RDI: ffffffff8fe50ce0
[   15.042473][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.042474][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.042476][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.042480][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.042485][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.042488][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.042490][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.042493][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.042498][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.042502][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.042506][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.042510][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.042513][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.042518][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.764993][    C3] INFO: lockdep is turned off.
| [   16.765216][    C3] Preemption disabled at:
| [ 16.765219][ C3] 0x0 
| [   16.765710][    C3] Tainted: [W]=WARN
[   16.765712][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.765716][    C3] Call Trace:
[   16.765719][    C3]  <IRQ>
[ 16.765722][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.765735][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 16.765745][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.765751][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.765756][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.765763][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.765773][ 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) 
[ 16.765782][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.765787][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.765794][ 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) 
[ 16.765802][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.765807][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.765816][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.765821][ 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:2333) 
[ 16.765830][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.765838][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.765843][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.765849][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.765857][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.765864][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.765869][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.765873][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.765877][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.765885][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.765889][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.765894][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.765903][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.765910][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.765917][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.765926][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.765931][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.765936][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.765939][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.765944][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.765948][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.765954][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.765960][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.765964][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.765969][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.765972][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.765974][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.765978][    C3]  </IRQ>
[   16.765979][    C3]  <TASK>
[ 16.765981][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.765984][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.765988][ C3] 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
[   16.765991][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   16.765995][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffff8fb55a19
[   16.765997][    C3] RDX: ffffed1006c3667b RSI: ffffffff8fe50c60 RDI: ffffffff8d384d8f
[   16.765999][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c3667a
[   16.766001][    C3] R10: ffff8880361b33d3 R11: ffff888001d70558 R12: 0000000000000000
[   16.766003][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 16.766007][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.766011][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.766016][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.766018][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.766021][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.766025][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.766029][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.766034][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.766038][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.766041][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.766045][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit