======================================
| [   15.469015][    C2] 1 lock held by swapper/2/0:
| [ 15.469208][ C2] #0: ffffffffb3d74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   15.469549][    C2]
| [   15.469549][    C2] stack backtrace:
[   15.469939][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.469942][    C2] Call Trace:
[   15.469945][    C2]  <IRQ>
[ 15.469948][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.469956][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 15.469966][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 15.469975][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.469983][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 15.469991][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 15.469997][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 15.470003][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 15.470012][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 15.470018][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.470025][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.470032][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 15.470037][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.470044][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.470050][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 15.470055][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 15.470061][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.470067][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.470073][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.470079][ 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) 
[ 15.470085][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.470090][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.470095][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.470099][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.470106][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.470111][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.470117][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.470120][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.470125][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.470131][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.470136][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.470141][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.470148][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.470159][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.470164][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 15.470170][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.470175][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.470182][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.470189][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.470195][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.470201][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.470207][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.470215][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.470220][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.470229][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.470233][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.470237][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.470243][    C2]  </IRQ>
[   15.470245][    C2]  <TASK>
[ 15.470248][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.470252][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.470258][ 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
[   15.470263][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.470269][    C2] RAX: 000000000004b8e1 RBX: 1ffff92000028fc1 RCX: ffffffffb2d55a19
[   15.470272][    C2] RDX: 0000000000000000 RSI: ffffffffb3885f31 RDI: ffffffffb3050ce0
[   15.470276][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.470279][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.470282][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.470290][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.470300][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.470304][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.470308][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.470314][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.470321][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.470329][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.470336][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.470342][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.470348][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.470357][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.486628][    C2] RCU nest depth: 0, expected: 0
| [   15.486822][    C2] INFO: lockdep is turned off.
| [   15.487009][    C2] Preemption disabled at:
| [ 15.487011][ C2] 0x0 
[   15.487389][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.487391][    C2] Call Trace:
[   15.487393][    C2]  <IRQ>
[ 15.487395][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.487402][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 15.487408][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.487411][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.487414][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 15.487418][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 15.487424][ 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) 
[ 15.487428][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 15.487431][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.487434][ 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) 
[ 15.487438][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.487441][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 15.487446][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.487449][ 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) 
[ 15.487455][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.487459][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.487462][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.487465][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 15.487469][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.487473][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.487476][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.487479][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.487481][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.487485][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.487488][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.487491][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.487496][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.487502][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.487506][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 15.487510][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.487512][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 15.487516][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 15.487521][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 15.487524][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.487528][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 15.487532][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.487536][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 15.487540][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.487544][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.487547][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.487549][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   15.487552][    C2]  </IRQ>
[   15.487553][    C2]  <TASK>
[ 15.487555][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.487558][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 15.487561][ 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
[   15.487564][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   15.487568][    C2] RAX: 000000000004b8e1 RBX: 1ffff92000028fc1 RCX: ffffffffb2d55a19
[   15.487570][    C2] RDX: 0000000000000000 RSI: ffffffffb3885f31 RDI: ffffffffb3050ce0
[   15.487572][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   15.487573][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   15.487575][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 15.487579][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.487584][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 15.487586][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.487588][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.487592][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.487596][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 15.487601][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.487605][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.487609][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.487612][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.487617][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.772884][    C1] INFO: lockdep is turned off.
| [   17.773045][    C1] Preemption disabled at:
| [ 17.773046][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   17.773384][    C1] Tainted: [W]=WARN
[   17.773385][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.773387][    C1] Call Trace:
[   17.773389][    C1]  <TASK>
[ 17.773392][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.773400][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 17.773409][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.773414][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.773419][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.773425][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.773432][ 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) 
[ 17.773436][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.773439][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.773444][ 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) 
[ 17.773448][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.773451][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.773457][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.773460][ 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) 
[ 17.773465][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.773470][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.773473][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.773477][ C1] ? kthread (kernel/kthread.c:464) 
[ 17.773481][ C1] ? ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.773487][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 17.773492][ 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) 
[ 17.773496][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2392) 
[ 17.773500][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.773504][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.773509][ C1] __put_net (net/core/net_namespace.c:732) 
[ 17.773512][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.773516][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.773519][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.773524][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.773528][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.773531][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.773537][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.773540][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 17.773544][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 17.773547][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 17.773549][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 17.773553][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 17.773556][ C1] kthread (kernel/kthread.c:464) 
[ 17.773560][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.773562][ C1] ? ret_from_fork (arch/x86/kernel/process.c:152) 
[ 17.773566][ C1] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 17.773571][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.773574][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 17.773578][ C1] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 17.773581][ 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