======================================
| [   14.491313][    C2] 1 lock held by ksoftirqd/2/27:
| [ 14.491498][ C2] #0: ffffffffb53774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   14.491825][    C2]
| [   14.491825][    C2] stack backtrace:
[   14.492058][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.492060][    C2] Call Trace:
[   14.492062][    C2]  <TASK>
[ 14.492064][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.492070][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 14.492075][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 14.492079][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.492084][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 14.492090][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 14.492093][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 14.492096][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 14.492100][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 14.492104][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 14.492107][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.492111][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.492115][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 14.492118][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.492122][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.492125][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.492129][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 14.492133][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.492136][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.492142][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.492146][ 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) 
[ 14.492151][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.492154][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.492157][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.492161][ C2] ? kthread (kernel/kthread.c:464) 
[ 14.492164][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.492166][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.492169][ 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) 
[ 14.492173][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.492178][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.492181][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.492185][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.492187][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.492192][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.492195][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.492198][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.492201][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.492205][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.492209][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.492213][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.492216][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.492219][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.492223][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.492227][ C2] kthread (kernel/kthread.c:464) 
[ 14.492230][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.492232][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.492234][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.492237][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.492240][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.492243][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.492246][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.492248][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.503161][    C2] RCU nest depth: 0, expected: 0
| [   14.503338][    C2] INFO: lockdep is turned off.
| [   14.503527][    C2] Preemption disabled at:
| [ 14.503528][ C2] handle_softirqs (kernel/softirq.c:553) 
[   14.503914][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.503916][    C2] Call Trace:
[   14.503918][    C2]  <TASK>
[ 14.503919][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.503926][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 14.503932][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.503936][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.503938][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 14.503942][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.503947][ 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) 
[ 14.503952][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 14.503955][ 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) 
[ 14.503959][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.503963][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.503966][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.503971][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.503975][ 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) 
[ 14.503979][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.503982][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.503985][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.503989][ C2] ? kthread (kernel/kthread.c:464) 
[ 14.503991][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.503994][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.504000][ 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) 
[ 14.504003][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.504008][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.504012][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.504016][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.504018][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.504023][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.504026][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.504029][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.504032][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.504036][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.504040][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.504044][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.504048][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.504051][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.504054][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.504058][ C2] kthread (kernel/kthread.c:464) 
[ 14.504061][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.504063][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.504066][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.504070][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.504073][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.504076][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.504078][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.504081][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.119866][    C3] INFO: lockdep is turned off.
| [   16.120053][    C3] Preemption disabled at:
| [ 16.120055][ C3] 0x0 
| [   16.120398][    C3] Tainted: [W]=WARN
[   16.120400][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.120402][    C3] Call Trace:
[   16.120404][    C3]  <IRQ>
[ 16.120406][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.120415][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 16.120422][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.120426][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.120429][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.120433][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.120439][ 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) 
[ 16.120444][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.120447][ 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) 
[ 16.120450][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.120456][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.120459][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 16.120464][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.120468][ 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) 
[ 16.120473][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.120476][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.120479][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.120485][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.120490][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.120493][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.120497][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.120499][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.120502][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.120505][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.120508][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.120510][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.120514][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.120520][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.120523][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.120528][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.120535][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.120539][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.120542][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.120546][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.120550][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.120556][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.120562][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.120566][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.120572][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.120575][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.120578][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.120582][    C3]  </IRQ>
[   16.120583][    C3]  <TASK>
[ 16.120584][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.120587][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.120591][ C3] 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
[   16.120594][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   16.120597][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffb438f5d9
[   16.120599][    C3] RDX: ffffed1006c366fb RSI: ffffffffb4653b60 RDI: ffffffffb1b8d18f
[   16.120601][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   16.120602][    C3] R10: ffff8880361b37d3 R11: ffff88800a1e8558 R12: 0000000000000000
[   16.120604][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 16.120608][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.120611][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.120615][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.120617][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.120620][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.120623][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.120627][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.120631][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.120634][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.120637][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.120640][ 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