======================================
| [   16.387944][    C2] 1 lock held by swapper/2/0:
| [ 16.388132][ C2] #0: ffffffffb41774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   16.388466][    C2]
| [   16.388466][    C2] stack backtrace:
[   16.388703][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.388705][    C2] Call Trace:
[   16.388707][    C2]  <IRQ>
[ 16.388709][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.388715][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 16.388719][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 16.388724][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.388729][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 16.388735][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 16.388738][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 16.388741][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 16.388744][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 16.388748][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 16.388751][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.388755][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.388760][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 16.388762][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.388767][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.388770][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 16.388774][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 16.388778][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.388781][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.388786][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.388790][ 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:2376) 
[ 16.388795][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.388798][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.388801][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.388804][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.388809][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.388813][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.388816][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.388818][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.388821][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.388824][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.388826][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.388829][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.388832][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.388840][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.388843][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.388847][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.388850][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.388853][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.388858][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.388861][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.388865][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.388867][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.388872][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.388877][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.388882][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.388885][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.388888][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.388891][    C2]  </IRQ>
[   16.388893][    C2]  <TASK>
[ 16.388894][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.388897][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.388901][ C2] Code: 92 b5 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 83 37 10 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b5 00                	mov    $0x0,%ch
   3:	c3                   	ret
   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 83 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  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:	e9 fc 54 02 00       	jmp    0x25501
   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
[   16.388904][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   16.388907][    C2] RAX: 000000000003cf37 RBX: 1ffff92000028fc1 RCX: ffffffffb31905d9
[   16.388909][    C2] RDX: 0000000000000000 RSI: ffffffffb3c8f4e4 RDI: ffffffffb3453be0
[   16.388911][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   16.388913][    C2] R10: ffff8880361337d3 R11: ffffffffb3e11288 R12: 0000000000000000
[   16.388914][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.388918][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.388923][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.388925][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.388928][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.388931][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.388935][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.388940][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.388943][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.388946][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.388949][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.388953][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.404613][    C2] RCU nest depth: 0, expected: 0
| [   16.404800][    C2] INFO: lockdep is turned off.
| [   16.404984][    C2] Preemption disabled at:
| [ 16.404986][ C2] 0x0 
[   16.405318][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.405319][    C2] Call Trace:
[   16.405321][    C2]  <IRQ>
[ 16.405323][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.405330][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 16.405337][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.405341][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.405344][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.405348][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.405353][ 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) 
[ 16.405359][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.405362][ 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) 
[ 16.405365][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.405371][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.405373][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.405379][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.405382][ 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:2376) 
[ 16.405387][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.405391][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.405394][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.405398][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.405402][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.405406][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.405409][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.405412][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.405414][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.405417][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.405419][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.405422][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.405425][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.405432][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.405436][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.405440][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.405442][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.405446][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 16.405451][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.405454][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.405459][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 16.405461][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.405466][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.405470][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.405476][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.405479][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.405482][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.405487][    C2]  </IRQ>
[   16.405488][    C2]  <TASK>
[ 16.405490][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.405492][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.405496][ C2] Code: 92 b5 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 83 37 10 00 fb f4 <e9> fc 54 02 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	92                   	xchg   %eax,%edx
   1:	b5 00                	mov    $0x0,%ch
   3:	c3                   	ret
   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 83 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	e9 fc 54 02 00       	jmp    0x2552b		<-- trapping instruction
  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:	e9 fc 54 02 00       	jmp    0x25501
   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
[   16.405499][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000242
[   16.405503][    C2] RAX: 000000000003cf37 RBX: 1ffff92000028fc1 RCX: ffffffffb31905d9
[   16.405505][    C2] RDX: 0000000000000000 RSI: ffffffffb3c8f4e4 RDI: ffffffffb3453be0
[   16.405506][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   16.405508][    C2] R10: ffff8880361337d3 R11: ffffffffb3e11288 R12: 0000000000000000
[   16.405510][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.405513][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.405518][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.405521][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.405523][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.405526][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.405530][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.405534][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.405538][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.405540][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.405543][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.405548][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.737327][    C1] INFO: lockdep is turned off.
| [   18.737495][    C1] Preemption disabled at:
| [ 18.737496][ C1] handle_softirqs (kernel/softirq.c:553) 
| [   18.737827][    C1] Tainted: [W]=WARN
[   18.737829][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.737831][    C1] Call Trace:
[   18.737833][    C1]  <TASK>
[ 18.737835][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.737842][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 18.737849][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.737854][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.737857][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 18.737861][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.737866][ 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) 
[ 18.737872][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 18.737875][ 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) 
[ 18.737878][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.737884][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.737887][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 18.737892][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 18.737896][ 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:2376) 
[ 18.737901][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.737904][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 18.737908][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.737912][ C1] ? kthread (kernel/kthread.c:464) 
[ 18.737914][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.737918][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 18.737924][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 18.737928][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 18.737931][ C1] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.737935][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.737940][ C1] __put_net (net/core/net_namespace.c:732) 
[ 18.737943][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 18.737947][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.737950][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 18.737954][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 18.737958][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.737961][ C1] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.737968][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 18.737973][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 18.737977][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 18.737980][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 18.737983][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 18.737987][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 18.737991][ C1] kthread (kernel/kthread.c:464) 
[ 18.737994][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.737996][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 18.737998][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 18.738002][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 18.738005][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 18.738008][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 18.738011][ 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