======================================
| [   16.287530][    C3] 1 lock held by swapper/3/0:
| [ 16.287728][ C3] #0: ffffffff97374480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   16.288069][    C3]
| [   16.288069][    C3] stack backtrace:
[   16.288314][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.288316][    C3] Call Trace:
[   16.288318][    C3]  <IRQ>
[ 16.288320][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.288327][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 16.288332][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 16.288337][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.288342][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 16.288346][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 16.288351][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 16.288354][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 16.288360][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 16.288363][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.288368][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.288374][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.288377][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.288381][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.288385][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.288388][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 16.288392][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.288395][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.288400][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.288403][ 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) 
[ 16.288408][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.288411][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.288414][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.288417][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.288421][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.288425][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.288428][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.288430][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.288432][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.288436][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.288439][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.288442][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.288446][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.288452][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.288456][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.288460][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.288463][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.288467][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.288471][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.288474][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.288478][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.288481][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.288486][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.288489][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.288494][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.288496][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.288498][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.288502][    C3]  </IRQ>
[   16.288503][    C3]  <TASK>
[ 16.288504][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.288507][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.288512][ 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
[   16.288515][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   16.288518][    C3] RAX: 000000000004908f RBX: 1ffff9200002afc1 RCX: ffffffff96355a19
[   16.288520][    C3] RDX: 0000000000000000 RSI: ffffffff96e85f31 RDI: ffffffff96650ce0
[   16.288522][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   16.288524][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   16.288525][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 16.288529][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.288535][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.288537][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.288539][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.288543][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.288547][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.288552][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.288556][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.288560][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.288563][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.288568][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.305019][    C3] RCU nest depth: 0, expected: 0
| [   16.305303][    C3] INFO: lockdep is turned off.
| [   16.305489][    C3] Preemption disabled at:
| [ 16.305490][ C3] 0x0 
[   16.305819][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.305822][    C3] Call Trace:
[   16.305823][    C3]  <IRQ>
[ 16.305826][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.305833][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 16.305840][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.305844][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.305847][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.305851][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.305857][ 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) 
[ 16.305862][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.305864][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.305869][ 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) 
[ 16.305873][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.305876][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.305881][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.305884][ 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) 
[ 16.305889][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.305893][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.305896][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.305899][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.305904][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.305908][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.305911][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.305914][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.305916][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.305920][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.305923][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.305926][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.305931][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.305936][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.305940][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.305943][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.305946][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.305950][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.305955][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.305959][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.305963][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.305966][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.305971][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.305974][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.305979][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.305981][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.305984][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.305987][    C3]  </IRQ>
[   16.305988][    C3]  <TASK>
[ 16.305989][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.305992][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.305996][ 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
[   16.305998][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   16.306002][    C3] RAX: 000000000004908f RBX: 1ffff9200002afc1 RCX: ffffffff96355a19
[   16.306004][    C3] RDX: 0000000000000000 RSI: ffffffff96e85f31 RDI: ffffffff96650ce0
[   16.306005][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   16.306007][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   16.306009][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 16.306012][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.306018][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.306020][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.306023][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.306026][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.306030][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.306035][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.306039][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.306043][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.306046][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.306051][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.732919][    C2] INFO: lockdep is turned off.
| [   18.733094][    C2] Preemption disabled at:
| [ 18.733096][ C2] 0x0 
| [   18.733421][    C2] Tainted: [W]=WARN
[   18.733422][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.733424][    C2] Call Trace:
[   18.733426][    C2]  <IRQ>
[ 18.733428][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.733437][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 18.733444][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.733448][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.733450][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.733455][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.733461][ 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) 
[ 18.733466][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.733468][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.733473][ 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) 
[ 18.733480][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.733484][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.733490][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.733495][ 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) 
[ 18.733501][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.733507][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.733509][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.733513][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.733518][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.733522][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.733525][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.733528][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.733530][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.733535][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 18.733538][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.733541][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.733546][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 18.733551][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.733555][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.733560][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.733563][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 18.733570][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.733573][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.733578][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.733582][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.733587][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.733592][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.733596][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.733601][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.733603][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.733605][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.733609][    C2]  </IRQ>
[   18.733610][    C2]  <TASK>
[ 18.733611][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.733614][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 18.733618][ 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
[   18.733621][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   18.733625][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff96355a19
[   18.733627][    C2] RDX: ffffed1006c2667b RSI: ffffffff96650c60 RDI: ffffffff93b84d8f
[   18.733629][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   18.733631][    C2] R10: ffff8880361333d3 R11: ffff888001d5a858 R12: 0000000000000000
[   18.733633][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 18.733637][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 18.733641][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.733645][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 18.733647][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 18.733650][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 18.733653][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 18.733658][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 18.733662][ C2] do_idle (kernel/sched/idle.c:325) 
[ 18.733666][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 18.733670][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 18.733673][ 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