======================================
| [   15.972661][    C3] 1 lock held by swapper/3/0:
| [ 15.972862][ C3] #0: ffffffff8e7749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.973222][    C3]
| [   15.973222][    C3] stack backtrace:
[   15.973477][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.973480][    C3] Call Trace:
[   15.973482][    C3]  <IRQ>
[ 15.973484][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.973491][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.973496][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.973502][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.973509][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.973513][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.973518][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.973522][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.973527][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.973530][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.973533][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.973540][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.973542][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.973545][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.973549][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.973551][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 15.973554][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.973557][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.973563][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.973566][ 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:2366) 
[ 15.973573][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.973576][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.973579][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.973582][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.973587][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.973591][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.973595][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.973597][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.973599][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.973604][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.973607][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.973610][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.973615][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.973622][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.973627][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.973631][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.973634][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.973638][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.973642][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.973646][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.973650][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.973653][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.973658][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.973662][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.973667][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.973669][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.973672][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.973675][    C3]  </IRQ>
[   15.973676][    C3]  <TASK>
[ 15.973678][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.973681][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.973685][ C3] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 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:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  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
[   15.973688][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000242
[   15.973692][    C3] RAX: 0000000000048961 RBX: 1ffff9200002afc1 RCX: ffffffff8d75ba19
[   15.973694][    C3] RDX: 0000000000000000 RSI: ffffffff8e287785 RDI: ffffffff8da51260
[   15.973695][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.973697][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.973699][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.973703][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.973708][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.973710][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.973712][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.973716][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.973720][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.973725][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.973729][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.973733][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.973736][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.973742][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.990833][    C3] RCU nest depth: 0, expected: 0
| [   15.991026][    C3] INFO: lockdep is turned off.
| [   15.991227][    C3] Preemption disabled at:
| [ 15.991229][ C3] 0x0 
[   15.991582][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.991585][    C3] Call Trace:
[   15.991587][    C3]  <IRQ>
[ 15.991589][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.991596][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 15.991602][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.991607][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.991611][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.991616][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.991623][ 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) 
[ 15.991628][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.991631][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.991635][ 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) 
[ 15.991640][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.991643][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.991649][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.991652][ 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:2366) 
[ 15.991657][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.991661][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.991664][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.991668][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.991673][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.991676][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.991679][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.991682][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.991684][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.991690][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 15.991693][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.991696][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.991701][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.991708][ C3] __put_net (net/core/net_namespace.c:732) 
[ 15.991712][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 15.991716][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.991719][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 15.991723][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.991728][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.991732][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.991736][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.991740][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.991745][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.991749][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 15.991754][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.991756][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.991759][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.991762][    C3]  </IRQ>
[   15.991763][    C3]  <TASK>
[ 15.991765][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.991767][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.991772][ C3] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 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:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  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
[   15.991774][    C3] RSP: 0000:ffffc90000157de8 EFLAGS: 00000242
[   15.991777][    C3] RAX: 0000000000048961 RBX: 1ffff9200002afc1 RCX: ffffffff8d75ba19
[   15.991779][    C3] RDX: 0000000000000000 RSI: ffffffff8e287785 RDI: ffffffff8da51260
[   15.991781][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   15.991783][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   15.991785][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 15.991789][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.991793][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.991795][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.991798][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.991802][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.991806][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.991811][ C3] do_idle (kernel/sched/idle.c:325) 
[ 15.991815][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.991819][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.991822][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.991827][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.655319][    C1] INFO: lockdep is turned off.
| [   17.655514][    C1] Preemption disabled at:
| [ 17.655517][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   17.655858][    C1] Tainted: [W]=WARN
[   17.655859][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.655861][    C1] Call Trace:
[   17.655864][    C1]  <TASK>
[ 17.655866][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.655876][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 17.655884][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.655890][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.655894][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.655900][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.655909][ 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) 
[ 17.655915][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.655918][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.655924][ 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) 
[ 17.655929][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.655932][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.655939][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.655942][ 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:2366) 
[ 17.655949][ C1] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.655955][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.655958][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.655961][ C1] ? kthread (kernel/kthread.c:464) 
[ 17.655966][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.655970][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.655978][ 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) 
[ 17.655983][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 17.655987][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.655991][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.655996][ C1] __put_net (net/core/net_namespace.c:732) 
[ 17.656001][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.656005][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.656008][ C1] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.656013][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.656017][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.656020][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.656026][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.656031][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 17.656034][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.656038][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.656040][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.656043][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.656047][ C1] kthread (kernel/kthread.c:464) 
[ 17.656050][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.656053][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 17.656055][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 17.656058][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.656061][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.656065][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.656067][ C1] ? __pfx_kthread (kernel/kthread.c:413) 


Finger prints:
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal
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