======================================
| [   14.696608][    C2] 1 lock held by ksoftirqd/2/27:
| [ 14.696778][ C2] #0: ffffffffa85774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   14.697079][    C2]
| [   14.697079][    C2] stack backtrace:
[   14.697289][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.697291][    C2] Call Trace:
[   14.697293][    C2]  <TASK>
[ 14.697296][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.697302][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 14.697306][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 14.697311][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.697315][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 14.697321][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 14.697325][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 14.697328][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 14.697331][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 14.697335][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 14.697338][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.697343][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.697347][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 14.697350][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.697354][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.697358][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.697361][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 14.697365][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.697368][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.697374][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.697378][ 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) 
[ 14.697384][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.697386][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.697390][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.697394][ C2] ? kthread (kernel/kthread.c:464) 
[ 14.697397][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.697400][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.697403][ 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) 
[ 14.697407][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.697412][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.697417][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.697421][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.697423][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.697428][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.697431][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.697434][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.697437][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.697441][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.697445][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.697449][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.697453][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.697456][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.697459][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.697463][ C2] kthread (kernel/kthread.c:464) 
[ 14.697466][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.697468][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.697471][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.697474][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.697477][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.697480][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.697483][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.697485][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.707836][    C2] RCU nest depth: 0, expected: 0
| [   14.708005][    C2] INFO: lockdep is turned off.
| [   14.708174][    C2] Preemption disabled at:
| [ 14.708175][ C2] handle_softirqs (kernel/softirq.c:553) 
[   14.708521][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.708522][    C2] Call Trace:
[   14.708524][    C2]  <TASK>
[ 14.708526][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.708531][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 14.708538][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.708542][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.708544][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 14.708548][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.708552][ 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) 
[ 14.708558][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 14.708561][ 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) 
[ 14.708564][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.708569][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.708572][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.708577][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.708580][ 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) 
[ 14.708585][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.708588][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.708591][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.708595][ C2] ? kthread (kernel/kthread.c:464) 
[ 14.708597][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.708600][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.708605][ 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) 
[ 14.708609][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.708614][ C2] __put_net (net/core/net_namespace.c:732) 
[ 14.708617][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.708621][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.708624][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.708628][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.708632][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.708634][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.708638][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.708642][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.708646][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 14.708650][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.708653][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.708656][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.708660][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.708664][ C2] kthread (kernel/kthread.c:464) 
[ 14.708667][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.708669][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.708671][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.708675][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.708678][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.708681][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.708684][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.708686][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   16.284004][    C3] INFO: lockdep is turned off.
| [   16.284176][    C3] Preemption disabled at:
| [ 16.284178][ C3] 0x0 
| [   16.284490][    C3] Tainted: [W]=WARN
[   16.284492][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.284494][    C3] Call Trace:
[   16.284496][    C3]  <IRQ>
[ 16.284497][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.284506][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 16.284513][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.284518][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.284521][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 16.284525][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.284530][ 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) 
[ 16.284536][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 16.284539][ 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) 
[ 16.284542][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.284548][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.284551][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 16.284557][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.284560][ 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) 
[ 16.284566][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.284569][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.284572][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.284577][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 16.284582][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.284586][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.284589][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.284592][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.284594][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.284598][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.284600][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.284602][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.284606][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.284611][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.284616][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.284620][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.284624][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 16.284628][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.284630][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 16.284635][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 16.284639][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 16.284643][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 16.284648][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.284653][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.284656][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.284659][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   16.284662][    C3]  </IRQ>
[   16.284664][    C3]  <TASK>
[ 16.284665][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.284668][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 16.284672][ 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
[   16.284674][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   16.284678][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffffa758f5d9
[   16.284680][    C3] RDX: ffffed1006c366fb RSI: ffffffffa7853b60 RDI: ffffffffa4d8d18f
[   16.284681][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   16.284683][    C3] R10: ffff8880361b37d3 R11: ffff888001bdcad8 R12: 0000000000000000
[   16.284685][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 16.284688][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.284692][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.284696][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 16.284698][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.284701][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.284704][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.284707][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 16.284712][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.284715][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.284718][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.284721][ 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