======================================
| [   17.581905][    C3] 1 lock held by swapper/3/0:
| [ 17.582085][ C3] #0: ffffffff92774480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   17.582412][    C3]
| [   17.582412][    C3] stack backtrace:
[   17.582640][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.582642][    C3] Call Trace:
[   17.582644][    C3]  <IRQ>
[ 17.582646][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.582653][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 17.582659][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 17.582664][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.582669][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 17.582673][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 17.582677][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 17.582681][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 17.582686][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 17.582689][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.582696][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.582703][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.582707][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.582714][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.582717][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.582720][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 17.582724][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.582728][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.582733][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.582736][ 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) 
[ 17.582742][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.582745][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.582748][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.582750][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.582755][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.582758][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.582761][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.582764][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.582766][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.582771][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.582773][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.582777][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.582781][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.582787][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.582790][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.582794][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.582797][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.582800][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.582804][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.582808][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.582811][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.582815][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.582819][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.582822][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.582827][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.582829][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.582832][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.582835][    C3]  </IRQ>
[   17.582836][    C3]  <TASK>
[ 17.582837][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.582840][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.582844][ 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
[   17.582847][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   17.582851][    C3] RAX: 0000000000044027 RBX: 1ffff9200002afc1 RCX: ffffffff91755a19
[   17.582853][    C3] RDX: 0000000000000000 RSI: ffffffff92285f31 RDI: ffffffff91a50ce0
[   17.582855][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   17.582857][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   17.582859][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.582862][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.582868][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.582870][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.582872][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.582876][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.582880][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.582885][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.582889][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.582892][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.582895][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.582900][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.598282][    C3] RCU nest depth: 0, expected: 0
| [   17.598451][    C3] INFO: lockdep is turned off.
| [   17.598617][    C3] Preemption disabled at:
| [ 17.598619][ C3] 0x0 
[   17.599041][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.599044][    C3] Call Trace:
[   17.599045][    C3]  <IRQ>
[ 17.599047][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.599055][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 17.599061][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.599065][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.599067][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.599071][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.599077][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 17.599082][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.599084][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.599088][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 17.599092][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.599095][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.599100][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.599103][ 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) 
[ 17.599108][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.599112][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.599115][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.599118][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.599123][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.599126][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.599129][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.599131][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.599134][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.599138][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.599141][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.599144][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.599149][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.599155][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.599158][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.599162][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.599165][ C3] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.599169][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.599173][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.599177][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.599181][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.599184][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.599189][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.599192][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.599197][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.599200][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.599202][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.599205][    C3]  </IRQ>
[   17.599206][    C3]  <TASK>
[ 17.599207][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.599210][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.599214][ 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
[   17.599217][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   17.599220][    C3] RAX: 0000000000044027 RBX: 1ffff9200002afc1 RCX: ffffffff91755a19
[   17.599222][    C3] RDX: 0000000000000000 RSI: ffffffff92285f31 RDI: ffffffff91a50ce0
[   17.599224][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   17.599225][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   17.599227][    C3] R13: ffff888001bb4640 R14: dffffc0000000000 R15: 0000000000000000
[ 17.599231][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.599236][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.599238][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.599240][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.599244][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.599248][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.599253][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.599257][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.599260][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.599263][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.599268][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   20.585240][    C1] INFO: lockdep is turned off.
| [   20.585400][    C1] Preemption disabled at:
| [ 20.585402][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   20.585723][    C1] Tainted: [W]=WARN
[   20.585724][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.585727][    C1] Call Trace:
[   20.585729][    C1]  <TASK>
[ 20.585731][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.585738][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 20.585744][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.585748][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.585750][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 20.585754][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.585761][ C1] ? 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) 
[ 20.585766][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 20.585768][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.585772][ C1] ? 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) 
[ 20.585777][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.585780][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.585786][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.585789][ C1] ? __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) 
[ 20.585794][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.585798][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.585800][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.585804][ C1] ? kthread (kernel/kthread.c:464) 
[ 20.585808][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 20.585813][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.585818][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2417) 
[ 20.585822][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 20.585826][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 20.585831][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.585835][ C1] __put_net (net/core/net_namespace.c:732) 
[ 20.585839][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 20.585843][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.585845][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.585850][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.585855][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.585858][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 20.585864][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.585867][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 20.585871][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.585874][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.585876][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.585879][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.585883][ C1] kthread (kernel/kthread.c:464) 
[ 20.585886][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.585889][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 20.585892][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 20.585897][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.585900][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.585904][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 20.585907][ C1] ? __pfx_kthread (kernel/kthread.c:413) 


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
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal