======================================
| [   19.815755][    C2] 1 lock held by ksoftirqd/2/27:
| [ 19.815928][ C2] #0: ffffffff923774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   19.816238][    C2]
| [   19.816238][    C2] stack backtrace:
[   19.816453][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.816455][    C2] Call Trace:
[   19.816457][    C2]  <TASK>
[ 19.816459][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.816465][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 19.816470][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 19.816474][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 19.816479][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 19.816484][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 19.816488][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 19.816491][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 19.816494][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 19.816498][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 19.816501][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 19.816505][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.816509][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 19.816512][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 19.816516][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 19.816520][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 19.816523][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 19.816527][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 19.816530][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 19.816536][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 19.816540][ 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) 
[ 19.816545][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.816548][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 19.816551][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.816556][ C2] ? kthread (kernel/kthread.c:464) 
[ 19.816558][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.816561][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 19.816564][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 19.816568][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 19.816574][ C2] __put_net (net/core/net_namespace.c:732) 
[ 19.816578][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 19.816582][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.816584][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.816589][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 19.816592][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.816595][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 19.816598][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 19.816602][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 19.816606][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 19.816610][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 19.816614][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 19.816617][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.816620][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 19.816624][ C2] kthread (kernel/kthread.c:464) 
[ 19.816627][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.816629][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 19.816632][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 19.816635][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.816638][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.816641][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.816644][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.816646][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   19.826984][    C2] RCU nest depth: 0, expected: 0
| [   19.827160][    C2] INFO: lockdep is turned off.
| [   19.827327][    C2] Preemption disabled at:
| [ 19.827329][ C2] handle_softirqs (kernel/softirq.c:553) 
[   19.827687][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   19.827689][    C2] Call Trace:
[   19.827691][    C2]  <TASK>
[ 19.827693][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 19.827698][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 19.827705][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 19.827709][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 19.827712][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 19.827715][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.827719][ 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) 
[ 19.827725][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 19.827728][ 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) 
[ 19.827731][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 19.827736][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 19.827739][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 19.827745][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 19.827748][ 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) 
[ 19.827753][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.827756][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 19.827759][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.827763][ C2] ? kthread (kernel/kthread.c:464) 
[ 19.827765][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.827769][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 19.827773][ C2] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 19.827776][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 19.827782][ C2] __put_net (net/core/net_namespace.c:732) 
[ 19.827785][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 19.827789][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.827791][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 19.827796][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 19.827799][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.827802][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 19.827805][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 19.827809][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 19.827813][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 19.827817][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 19.827821][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 19.827823][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 19.827827][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 19.827831][ C2] kthread (kernel/kthread.c:464) 
[ 19.827834][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.827836][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 19.827839][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 19.827842][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 19.827845][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.827848][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 19.827851][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 19.827854][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   25.919305][    C2] INFO: lockdep is turned off.
| [   25.919523][    C2] Preemption disabled at:
| [ 25.919526][ C2] 0x0 
| [   25.919927][    C2] Tainted: [W]=WARN
[   25.919930][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.919934][    C2] Call Trace:
[   25.919939][    C2]  <IRQ>
[ 25.919941][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.919977][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 25.919997][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 25.920003][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 25.920006][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 25.920020][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.920029][ 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) 
[ 25.920039][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 25.920042][ 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) 
[ 25.920045][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 25.920055][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 25.920058][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 25.920073][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 25.920077][ 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) 
[ 25.920092][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.920097][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 25.920100][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 25.920115][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 25.920122][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.920132][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 25.920135][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 25.920138][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.920141][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.920146][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 25.920148][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.920150][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.920159][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 25.920170][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 25.920178][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.920182][ C2] __put_net (net/core/net_namespace.c:732) 
[ 25.920187][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 25.920192][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.920194][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.920199][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 25.920202][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 25.920215][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 25.920223][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 25.920227][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 25.920232][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 25.920235][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 25.920238][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   25.920242][    C2]  </IRQ>
[   25.920243][    C2]  <TASK>
[ 25.920245][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.920248][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 25.920254][ 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
[   25.920256][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   25.920265][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff913905d9
[   25.920267][    C2] RDX: ffffed1006c266fb RSI: ffffffff91653b60 RDI: ffffffff8eb8d18f
[   25.920268][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   25.920270][    C2] R10: ffff8880361337d3 R11: ffff88800934cad8 R12: 0000000000000000
[   25.920272][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 25.920276][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 25.920279][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.920283][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 25.920286][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.920289][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.920292][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 25.920296][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 25.920300][ C2] do_idle (kernel/sched/idle.c:325) 
[ 25.920303][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.920306][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.920309][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal