======================================
| [   15.598720][    C2] 1 lock held by ksoftirqd/2/27:
| [ 15.598896][ C2] #0: ffffffff9d1774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.599211][    C2]
| [   15.599211][    C2] stack backtrace:
[   15.599430][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.599432][    C2] Call Trace:
[   15.599434][    C2]  <TASK>
[ 15.599437][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.599443][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.599447][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.599451][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.599456][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.599463][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.599466][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.599469][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.599473][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.599477][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.599480][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.599484][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.599488][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.599491][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.599495][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.599498][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.599502][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 15.599506][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.599509][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.599515][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.599518][ 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) 
[ 15.599524][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.599527][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.599530][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.599535][ C2] ? kthread (kernel/kthread.c:464) 
[ 15.599538][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.599540][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.599544][ 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) 
[ 15.599548][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.599554][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.599557][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.599562][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.599564][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.599569][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.599572][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.599575][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.599578][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.599582][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.599586][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.599590][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.599594][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.599597][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.599600][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.599604][ C2] kthread (kernel/kthread.c:464) 
[ 15.599607][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.599609][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.599612][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.599615][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.599618][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.599621][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.599623][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.599626][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.610016][    C2] RCU nest depth: 0, expected: 0
| [   15.610187][    C2] INFO: lockdep is turned off.
| [   15.610364][    C2] Preemption disabled at:
| [ 15.610366][ C2] handle_softirqs (kernel/softirq.c:553) 
[   15.610723][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.610725][    C2] Call Trace:
[   15.610727][    C2]  <TASK>
[ 15.610729][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.610735][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 15.610742][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.610747][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.610749][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.610754][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.610759][ 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) 
[ 15.610765][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.610768][ 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) 
[ 15.610771][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.610776][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.610779][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.610785][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.610788][ 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) 
[ 15.610794][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.610797][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.610800][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.610804][ C2] ? kthread (kernel/kthread.c:464) 
[ 15.610807][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.610811][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.610817][ 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) 
[ 15.610821][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.610826][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.610830][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.610834][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.610837][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.610841][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.610845][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.610848][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.610851][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.610855][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.610859][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.610864][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.610868][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.610870][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.610874][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.610878][ C2] kthread (kernel/kthread.c:464) 
[ 15.610881][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.610883][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.610886][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.610889][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.610892][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.610895][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.610898][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.610901][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   17.920852][    C3] INFO: lockdep is turned off.
| [   17.921023][    C3] Preemption disabled at:
| [ 17.921025][ C3] 0x0 
| [   17.921337][    C3] Tainted: [W]=WARN
[   17.921338][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.921340][    C3] Call Trace:
[   17.921342][    C3]  <IRQ>
[ 17.921344][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.921355][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 17.921363][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.921367][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.921370][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 17.921374][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.921379][ C3] ? 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) 
[ 17.921385][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 17.921388][ C3] ? 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) 
[ 17.921391][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.921396][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.921399][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 17.921406][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 17.921409][ C3] ? __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) 
[ 17.921415][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.921418][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 17.921421][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.921426][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 17.921431][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.921435][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 17.921438][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 17.921441][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.921443][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.921448][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 17.921450][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.921452][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.921456][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.921461][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.921465][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.921469][ C3] __put_net (net/core/net_namespace.c:732) 
[ 17.921473][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 17.921477][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.921480][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.921484][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 17.921488][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.921494][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.921499][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 17.921504][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 17.921510][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.921513][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.921515][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   17.921519][    C3]  </IRQ>
[   17.921520][    C3]  <TASK>
[ 17.921522][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.921524][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 17.921529][ C3] 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
[   17.921532][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   17.921536][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffff9c1905d9
[   17.921538][    C3] RDX: ffffed1006c366fb RSI: ffffffff9c453b60 RDI: ffffffff9998d18f
[   17.921540][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   17.921541][    C3] R10: ffff8880361b37d3 R11: ffff88800519a818 R12: 0000000000000000
[   17.921543][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 17.921547][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.921550][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.921554][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 17.921556][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.921559][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.921562][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.921566][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 17.921570][ C3] do_idle (kernel/sched/idle.c:325) 
[ 17.921573][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.921576][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.921579][ C3] ? __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