======================================
| [   14.478881][    C3] 1 lock held by swapper/3/0:
| [ 14.479058][ C3] #0: ffffffff94974480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.479377][    C3]
| [   14.479377][    C3] stack backtrace:
[   14.479602][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.479604][    C3] Call Trace:
[   14.479605][    C3]  <IRQ>
[ 14.479607][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.479613][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.479618][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.479623][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.479629][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.479633][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.479637][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.479641][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.479646][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.479649][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.479653][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.479658][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.479662][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.479666][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.479669][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.479672][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 14.479676][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.479679][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.479684][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.479687][ 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) 
[ 14.479693][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.479696][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.479698][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.479701][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.479704][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.479707][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.479710][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.479712][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.479715][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.479718][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.479721][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.479724][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.479728][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.479734][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.479737][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.479741][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.479744][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.479748][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.479752][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.479755][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.479759][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.479762][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.479767][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.479770][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.479774][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.479776][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.479779][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.479782][    C3]  </IRQ>
[   14.479783][    C3]  <TASK>
[ 14.479785][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.479787][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.479792][ 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
[   14.479795][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.479798][    C3] RAX: 000000000004b8e1 RBX: 1ffff9200002afc1 RCX: ffffffff93955a19
[   14.479801][    C3] RDX: 0000000000000000 RSI: ffffffff94485f31 RDI: ffffffff93c50ce0
[   14.479802][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   14.479804][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.479806][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.479810][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.479815][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.479817][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.479819][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.479823][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.479827][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.479832][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.479836][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.479839][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.479842][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.479847][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   14.494686][    C3] RCU nest depth: 0, expected: 0
| [   14.494861][    C3] INFO: lockdep is turned off.
| [   14.495029][    C3] Preemption disabled at:
| [ 14.495031][ C3] 0x0 
[   14.495325][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.495326][    C3] Call Trace:
[   14.495328][    C3]  <IRQ>
[ 14.495330][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.495336][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 14.495342][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.495345][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.495348][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.495351][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.495357][ 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) 
[ 14.495362][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.495364][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.495368][ 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) 
[ 14.495372][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.495375][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.495380][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.495383][ 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) 
[ 14.495388][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.495392][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.495395][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.495398][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.495402][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.495405][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.495408][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.495411][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.495413][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.495417][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 14.495420][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.495423][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.495427][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.495433][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.495436][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.495440][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.495443][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.495446][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.495450][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.495454][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.495458][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.495462][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.495466][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.495469][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.495474][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.495476][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.495478][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.495482][    C3]  </IRQ>
[   14.495483][    C3]  <TASK>
[ 14.495484][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.495487][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.495491][ 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
[   14.495493][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   14.495496][    C3] RAX: 000000000004b8e1 RBX: 1ffff9200002afc1 RCX: ffffffff93955a19
[   14.495498][    C3] RDX: 0000000000000000 RSI: ffffffff94485f31 RDI: ffffffff93c50ce0
[   14.495500][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   14.495502][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.495503][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 14.495507][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.495512][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.495515][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.495517][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.495521][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.495525][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.495529][ C3] do_idle (kernel/sched/idle.c:325) 
[ 14.495533][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.495537][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.495540][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.495545][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.243690][    C2] INFO: lockdep is turned off.
| [   16.243873][    C2] Preemption disabled at:
| [ 16.243875][ C2] 0x0 
| [   16.244195][    C2] Tainted: [W]=WARN
[   16.244196][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.244198][    C2] Call Trace:
[   16.244200][    C2]  <IRQ>
[ 16.244202][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.244210][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.244216][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.244220][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.244223][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.244227][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.244233][ 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) 
[ 16.244237][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.244240][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.244244][ 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) 
[ 16.244248][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.244251][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.244256][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.244259][ 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) 
[ 16.244265][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.244269][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.244272][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.244276][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.244281][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.244284][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.244287][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.244290][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.244292][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.244297][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.244300][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.244303][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.244308][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.244312][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.244315][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.244320][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.244324][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.244327][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.244330][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.244335][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.244339][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.244344][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.244349][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.244352][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.244357][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.244359][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.244362][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.244365][    C2]  </IRQ>
[   16.244366][    C2]  <TASK>
[ 16.244368][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.244370][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.244374][ 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
[   16.244377][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.244381][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff93955a19
[   16.244383][    C2] RDX: ffffed1006c2667b RSI: ffffffff93c50c60 RDI: ffffffff91184d8f
[   16.244385][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   16.244386][    C2] R10: ffff8880361333d3 R11: ffffc900001479d8 R12: 0000000000000000
[   16.244388][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.244392][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.244396][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.244400][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.244402][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.244405][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.244408][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.244412][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.244417][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.244422][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.244425][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.244429][ 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