======================================
| [   14.725018][    C3] 1 lock held by ksoftirqd/3/32:
| [ 14.725184][ C3] #0: ffffffffbb5774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   14.725476][    C3]
| [   14.725476][    C3] stack backtrace:
[   14.725682][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.725684][    C3] Call Trace:
[   14.725686][    C3]  <TASK>
[ 14.725688][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.725694][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 14.725698][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 14.725703][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.725707][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 14.725713][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 14.725716][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 14.725719][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 14.725722][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 14.725726][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 14.725729][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.725733][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.725738][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 14.725740][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.725744][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.725748][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.725751][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 14.725755][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.725758][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.725764][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.725767][ 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) 
[ 14.725773][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.725775][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.725779][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.725783][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.725786][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.725788][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.725791][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 14.725795][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.725800][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.725803][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.725808][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.725810][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.725814][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.725818][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.725820][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.725823][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.725828][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.725831][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.725835][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.725839][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.725842][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.725845][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.725849][ C3] kthread (kernel/kthread.c:464) 
[ 14.725852][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.725854][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.725856][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.725859][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.725862][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.725865][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.725868][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.725870][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.735887][    C3] RCU nest depth: 0, expected: 0
| [   14.736046][    C3] INFO: lockdep is turned off.
| [   14.736221][    C3] Preemption disabled at:
| [ 14.736223][ C3] handle_softirqs (kernel/softirq.c:553) 
[   14.736558][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.736560][    C3] Call Trace:
[   14.736561][    C3]  <TASK>
[ 14.736563][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.736568][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 14.736574][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.736578][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.736581][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 14.736584][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.736591][ 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) 
[ 14.736596][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 14.736599][ 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) 
[ 14.736602][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.736606][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.736609][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.736614][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.736617][ 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) 
[ 14.736621][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.736624][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.736627][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.736631][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.736633][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.736636][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.736640][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 14.736643][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.736649][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.736652][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.736656][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.736658][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.736663][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.736666][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.736669][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.736671][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.736675][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.736679][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.736683][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.736687][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.736690][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.736693][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.736697][ C3] kthread (kernel/kthread.c:464) 
[ 14.736700][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.736702][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.736705][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.736708][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.736711][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.736714][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.736717][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.736727][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.421416][    C2] INFO: lockdep is turned off.
| [   16.421601][    C2] Preemption disabled at:
| [ 16.421603][ C2] 0x0 
| [   16.421936][    C2] Tainted: [W]=WARN
[   16.421938][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.421939][    C2] Call Trace:
[   16.421941][    C2]  <IRQ>
[ 16.421943][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.421952][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 16.421959][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.421963][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.421966][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.421970][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.421975][ 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) 
[ 16.421981][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.421984][ 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) 
[ 16.421987][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.421992][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.421995][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 16.422001][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.422004][ 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) 
[ 16.422010][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.422013][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.422016][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.422021][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.422026][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.422030][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.422033][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.422036][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.422038][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.422041][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.422044][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.422046][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.422049][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.422055][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.422059][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.422063][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.422067][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.422071][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.422074][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.422078][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.422082][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.422087][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.422093][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.422098][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.422103][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.422106][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.422109][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.422112][    C2]  </IRQ>
[   16.422113][    C2]  <TASK>
[ 16.422115][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.422118][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.422122][ C2] Code: a2 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 47 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:	a2 b5 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b5
   7:	cc 0f 
   9:	1f                   	(bad)
   a:	00 90 90 90 90 90    	add    %dl,-0x6f6f6f70(%rax)
  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 47 10 00 	verw   0x104783(%rip)        # 0x1047ab
  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
[   16.422124][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.422128][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffba58f5d9
[   16.422130][    C2] RDX: ffffed1005ea66fb RSI: ffffffffba853b60 RDI: ffffffffb7d8d18f
[   16.422132][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1005ea66fa
[   16.422133][    C2] R10: ffff88802f5337d3 R11: ffff888001ee2818 R12: 0000000000000000
[   16.422135][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 16.422139][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.422142][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.422145][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.422148][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.422150][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.422153][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.422157][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.422161][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.422164][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.422167][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.422170][ 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