======================================
| [   14.790578][    C2] 1 lock held by swapper/2/0:
| [ 14.790786][ C2] #0: ffffffffa1d774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   14.791122][    C2]
| [   14.791122][    C2] stack backtrace:
[   14.791359][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.791361][    C2] Call Trace:
[   14.791363][    C2]  <IRQ>
[ 14.791365][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.791371][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 14.791376][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 14.791380][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.791384][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 14.791390][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 14.791394][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 14.791397][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 14.791400][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 14.791404][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 14.791407][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.791412][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.791416][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 14.791418][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.791423][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.791426][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.791429][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 14.791433][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.791436][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 14.791443][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 14.791446][ 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) 
[ 14.791451][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.791454][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 14.791458][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.791460][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 14.791465][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.791468][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 14.791472][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 14.791474][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.791477][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.791480][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 14.791482][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.791485][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.791488][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.791496][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.791500][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.791504][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.791506][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.791510][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 14.791514][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.791517][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.791521][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.791524][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.791528][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.791533][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.791538][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.791541][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.791544][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   14.791547][    C2]  </IRQ>
[   14.791548][    C2]  <TASK>
[ 14.791550][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.791552][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 14.791557][ 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
[   14.791560][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   14.791563][    C2] RAX: 000000000004071d RBX: 1ffff92000028fc1 RCX: ffffffffa0d905d9
[   14.791565][    C2] RDX: 0000000000000000 RSI: ffffffffa188f4e4 RDI: ffffffffa1053be0
[   14.791567][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   14.791568][    C2] R10: ffff8880361337d3 R11: ffffffffa1a11288 R12: 0000000000000000
[   14.791570][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 14.791574][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.791579][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 14.791581][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.791584][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.791587][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.791591][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 14.791595][ C2] do_idle (kernel/sched/idle.c:325) 
[ 14.791598][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.791601][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.791604][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.791609][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   14.807464][    C2] RCU nest depth: 0, expected: 0
| [   14.807646][    C2] INFO: lockdep is turned off.
| [   14.807828][    C2] Preemption disabled at:
| [ 14.807830][ C2] 0x0 
[   14.808269][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.808270][    C2] Call Trace:
[   14.808272][    C2]  <IRQ>
[ 14.808274][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.808281][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 14.808287][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.808291][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.808294][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 14.808298][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.808302][ 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) 
[ 14.808307][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 14.808310][ 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) 
[ 14.808313][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.808318][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.808321][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 14.808326][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 14.808329][ 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) 
[ 14.808333][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.808336][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 14.808340][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.808344][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 14.808348][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.808352][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 14.808355][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 14.808358][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.808360][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.808364][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 14.808366][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.808368][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.808371][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.808378][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.808381][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.808385][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.808388][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.808391][ C2] ? find_held_lock (kernel/locking/lockdep.c:5353) 
[ 14.808399][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.808402][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.808406][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.808409][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.808414][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.808417][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.808423][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.808425][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.808428][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   14.808432][    C2]  </IRQ>
[   14.808433][    C2]  <TASK>
[ 14.808434][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.808437][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 14.808441][ 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
[   14.808443][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   14.808446][    C2] RAX: 000000000004071d RBX: 1ffff92000028fc1 RCX: ffffffffa0d905d9
[   14.808448][    C2] RDX: 0000000000000000 RSI: ffffffffa188f4e4 RDI: ffffffffa1053be0
[   14.808450][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c266fa
[   14.808451][    C2] R10: ffff8880361337d3 R11: ffffffffa1a11288 R12: 0000000000000000
[   14.808453][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 14.808457][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.808461][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 14.808464][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.808466][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.808469][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.808473][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 14.808477][ C2] do_idle (kernel/sched/idle.c:325) 
[ 14.808480][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.808483][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.808486][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.808490][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.404100][    C0] INFO: lockdep is turned off.
| [   16.404270][    C0] Preemption disabled at:
| [ 16.404272][ C0] copy_fpstate_to_sigframe (./include/linux/instrumented.h:68 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/linux/thread_info.h:126 arch/x86/kernel/fpu/signal.c:214) 
| [   16.404682][    C0] Tainted: [W]=WARN
[   16.404683][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.404685][    C0] Call Trace:
[   16.404687][    C0]  <IRQ>
[ 16.404689][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.404696][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 16.404702][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.404706][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.404709][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.404713][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.404718][ 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) 
[ 16.404724][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.404727][ 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) 
[ 16.404730][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.404735][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.404738][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 16.404744][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 16.404747][ 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) 
[ 16.404753][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.404756][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 16.404759][ C0] ? __local_bh_enable_ip (kernel/softirq.c:407) 
[ 16.404764][ C0] ? copy_fpstate_to_sigframe (arch/x86/kernel/fpu/signal.c:222) 
[ 16.404766][ C0] ? get_sigframe (arch/x86/kernel/signal.c:163) 
[ 16.404771][ C0] ? x64_setup_rt_frame (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 arch/x86/kernel/signal_64.c:153 arch/x86/kernel/signal_64.c:176) 
[ 16.404775][ C0] ? handle_signal (arch/x86/kernel/signal.c:250 arch/x86/kernel/signal.c:294) 
[ 16.404778][ C0] ? arch_do_signal_or_restart (arch/x86/kernel/signal.c:340) 
[ 16.404781][ C0] ? exit_to_user_mode_loop (kernel/entry/common.c:113) 
[ 16.404785][ C0] ? do_syscall_64 (./include/linux/entry-common.h:330 ./include/linux/entry-common.h:414 ./include/linux/entry-common.h:449 arch/x86/entry/syscall_64.c:100) 
[ 16.404789][ C0] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[ 16.404792][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.404796][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.404800][ C0] __put_net (net/core/net_namespace.c:732) 
[ 16.404804][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.404808][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.404810][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.404815][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.404818][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.404821][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.404828][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.404833][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 16.404837][ C0] ? copy_fpstate_to_sigframe (./include/linux/bottom_half.h:33 ./arch/x86/include/asm/fpu/api.h:77 arch/x86/kernel/fpu/signal.c:220) 
[ 16.404840][ C0] do_softirq (kernel/softirq.c:480 kernel/softirq.c:467) 
[   16.404843][    C0]  </IRQ>
[   16.404844][    C0]  <TASK>
[ 16.404846][ C0] __local_bh_enable_ip (kernel/softirq.c:407) 
[ 16.404849][ C0] copy_fpstate_to_sigframe (arch/x86/kernel/fpu/signal.c:222) 
[ 16.404852][ C0] ? fpu__alloc_mathframe (arch/x86/kernel/fpu/signal.c:493) 
[ 16.404856][ C0] get_sigframe (arch/x86/kernel/signal.c:163) 
[ 16.404859][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.404863][ C0] ? __pfx_get_sigframe (arch/x86/kernel/signal.c:96) 
[ 16.404867][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.404870][ C0] ? trace_rseq_update (./include/trace/events/rseq.h:11 (discriminator 21)) 
[ 16.404877][ C0] x64_setup_rt_frame (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 arch/x86/kernel/signal_64.c:153 arch/x86/kernel/signal_64.c:176) 
[ 16.404881][ C0] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:425) 
[ 16.404885][ C0] ? __pfx_x64_setup_rt_frame (arch/x86/kernel/signal_64.c:165) 
[ 16.404891][ C0] handle_signal (arch/x86/kernel/signal.c:250 arch/x86/kernel/signal.c:294) 
[ 16.404895][ C0] arch_do_signal_or_restart (arch/x86/kernel/signal.c:340) 
[ 16.404899][ C0] ? __pfx_arch_do_signal_or_restart (arch/x86/kernel/signal.c:334) 
[ 16.404905][ C0] ? __x64_sys_rt_sigsuspend (kernel/signal.c:4858 kernel/signal.c:4848 kernel/signal.c:4848) 
[ 16.404909][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.404912][ C0] exit_to_user_mode_loop (kernel/entry/common.c:113) 
[ 16.404916][ C0] do_syscall_64 (./include/linux/entry-common.h:330 ./include/linux/entry-common.h:414 ./include/linux/entry-common.h:449 arch/x86/entry/syscall_64.c:100) 
[ 16.404919][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   16.404921][    C0] RIP: 0033:0x7f4c0ca0f06c
[ 16.404928][ C0] Code: Unable to access opcode bytes at 0x7f4c0ca0f042.

Code starting with the faulting instruction
===========================================
[   16.404930][    C0] RSP: 002b:00007ffdc047d7b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000082
[   16.404933][    C0] RAX: fffffffffffffffc RBX: 00007ffdc047d7f8 RCX: 00007f4c0ca0f06c
[   16.404935][    C0] RDX: 0000000000000001 RSI: 0000000000000008 RDI: 00007ffdc047d820
[   16.404937][    C0] RBP: 00007ffdc047d8a0 R08: 00007ffdc047d8a0 R09: 0000000000000000
[   16.404939][    C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdc047d820


Finger prints:
copy_fpstate_to_sigframe: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