======================================
| [   14.989842][    C2] 1 lock held by swapper/2/0:
| [ 14.990029][ C2] #0: ffffffff8fd774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   14.990361][    C2]
| [   14.990361][    C2] stack backtrace:
[   14.990595][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.990597][    C2] Call Trace:
[   14.990599][    C2]  <IRQ>
[ 14.990601][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.990607][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 14.990612][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 14.990616][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.990620][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 14.990626][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 14.990630][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 14.990633][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 14.990636][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 14.990640][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 14.990643][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.990647][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.990651][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 14.990654][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.990659][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.990662][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.990665][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 14.990669][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.990672][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 14.990678][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 14.990681][ 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) 
[ 14.990687][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.990690][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 14.990693][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.990696][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 14.990701][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.990704][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 14.990707][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 14.990710][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.990713][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.990716][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 14.990719][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.990721][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.990725][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.990732][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.990735][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.990740][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.990742][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.990745][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 14.990750][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.990753][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.990756][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.990759][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.990764][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.990768][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.990774][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.990777][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.990779][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   14.990783][    C2]  </IRQ>
[   14.990784][    C2]  <TASK>
[ 14.990785][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.990788][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 14.990792][ 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
[   14.990795][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   14.990798][    C2] RAX: 0000000000045687 RBX: 1ffff92000028fc1 RCX: ffffffff8ed905d9
[   14.990800][    C2] RDX: 0000000000000000 RSI: ffffffff8f88f4e4 RDI: ffffffff8f053be0
[   14.990802][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   14.990803][    C2] R10: ffff8880361337d3 R11: ffffffff8fa11288 R12: 0000000000000000
[   14.990805][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 14.990809][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.990814][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 14.990816][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.990819][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.990822][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.990826][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 14.990830][ C2] do_idle (kernel/sched/idle.c:325) 
[ 14.990834][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.990836][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.990839][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.990844][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   15.006833][    C2] RCU nest depth: 0, expected: 0
| [   15.007025][    C2] INFO: lockdep is turned off.
| [   15.007209][    C2] Preemption disabled at:
| [ 15.007211][ C2] 0x0 
[   15.007546][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.007548][    C2] Call Trace:
[   15.007549][    C2]  <IRQ>
[ 15.007551][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.007559][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 15.007566][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.007570][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.007573][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.007577][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.007581][ 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) 
[ 15.007587][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.007590][ 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) 
[ 15.007593][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.007598][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.007601][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.007606][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.007610][ 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) 
[ 15.007615][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.007618][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.007621][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.007625][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 15.007630][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.007633][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.007637][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.007639][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.007642][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.007645][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.007648][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.007650][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.007653][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.007660][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.007663][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.007667][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.007669][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.007673][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 15.007678][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.007681][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 15.007686][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.007688][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.007693][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.007698][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.007703][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.007706][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.007708][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   15.007712][    C2]  </IRQ>
[   15.007713][    C2]  <TASK>
[ 15.007715][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.007718][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.007721][ 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
[   15.007724][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   15.007727][    C2] RAX: 0000000000045687 RBX: 1ffff92000028fc1 RCX: ffffffff8ed905d9
[   15.007729][    C2] RDX: 0000000000000000 RSI: ffffffff8f88f4e4 RDI: ffffffff8f053be0
[   15.007731][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   15.007732][    C2] R10: ffff8880361337d3 R11: ffffffff8fa11288 R12: 0000000000000000
[   15.007734][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 15.007738][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.007742][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.007745][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.007748][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.007751][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.007754][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 15.007759][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.007762][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.007765][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.007768][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 15.007773][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.646279][    C0] INFO: lockdep is turned off.
| [   16.646446][    C0] Preemption disabled at:
| [ 16.646448][ C0] handle_softirqs (kernel/softirq.c:553) 
| [   16.646781][    C0] Tainted: [W]=WARN
[   16.646783][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.646785][    C0] Call Trace:
[   16.646787][    C0]  <TASK>
[ 16.646789][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.646796][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 16.646803][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.646807][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.646810][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.646814][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.646819][ C0] ? 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) 
[ 16.646825][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.646828][ C0] ? 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) 
[ 16.646831][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.646838][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.646841][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.646847][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.646850][ C0] ? __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) 
[ 16.646855][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.646859][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.646862][ C0] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.646866][ C0] ? kthread (kernel/kthread.c:464) 
[ 16.646869][ C0] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.646873][ C0] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 16.646878][ C0] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 16.646882][ C0] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 16.646885][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.646890][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.646894][ C0] __put_net (net/core/net_namespace.c:732) 
[ 16.646898][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.646902][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.646905][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.646912][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.646916][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.646919][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.646926][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.646930][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 16.646934][ C0] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 16.646938][ C0] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 16.646941][ C0] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 16.646945][ C0] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 16.646949][ C0] kthread (kernel/kthread.c:464) 
[ 16.646951][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.646954][ C0] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 16.646956][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 16.646960][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.646963][ C0] ? __pfx_kthread (kernel/kthread.c:413) 
[ 16.646966][ C0] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 16.646968][ C0] ? __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