======================================
| [   20.212666][    C2] 1 lock held by ksoftirqd/2/27:
| [ 20.212857][ C2] #0: ffffffff911774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   20.213176][    C2]
| [   20.213176][    C2] stack backtrace:
[   20.213411][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.213414][    C2] Call Trace:
[   20.213416][    C2]  <TASK>
[ 20.213420][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.213428][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 20.213433][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 20.213438][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.213443][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 20.213450][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 20.213453][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 20.213456][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 20.213460][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 20.213464][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 20.213467][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.213472][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.213477][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 20.213480][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.213484][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 20.213488][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 20.213491][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 20.213495][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 20.213498][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 20.213506][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.213509][ 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) 
[ 20.213517][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.213520][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.213523][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.213529][ C2] ? kthread (kernel/kthread.c:464) 
[ 20.213533][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.213537][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.213540][ 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) 
[ 20.213545][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.213550][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.213555][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.213559][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.213562][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.213566][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.213570][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.213573][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.213576][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.213581][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.213585][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.213589][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.213593][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.213596][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.213600][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.213604][ C2] kthread (kernel/kthread.c:464) 
[ 20.213606][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.213608][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.213611][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.213615][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.213618][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.213621][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.213624][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.213626][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   20.224493][    C2] RCU nest depth: 0, expected: 0
| [   20.224664][    C2] INFO: lockdep is turned off.
| [   20.224844][    C2] Preemption disabled at:
| [ 20.224846][ C2] handle_softirqs (kernel/softirq.c:553) 
[   20.225246][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.225248][    C2] Call Trace:
[   20.225251][    C2]  <TASK>
[ 20.225253][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.225262][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 20.225269][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.225274][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.225277][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 20.225282][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.225288][ 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) 
[ 20.225295][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 20.225298][ 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) 
[ 20.225301][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.225307][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.225310][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 20.225317][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.225321][ 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) 
[ 20.225327][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.225331][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.225334][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.225339][ C2] ? kthread (kernel/kthread.c:464) 
[ 20.225342][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.225347][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 20.225353][ 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) 
[ 20.225358][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 20.225363][ C2] __put_net (net/core/net_namespace.c:732) 
[ 20.225368][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 20.225372][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.225375][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 20.225380][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 20.225383][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.225386][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 20.225390][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 20.225395][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 20.225399][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 20.225403][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 20.225407][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 20.225410][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 20.225413][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 20.225417][ C2] kthread (kernel/kthread.c:464) 
[ 20.225420][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.225422][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 20.225425][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 20.225428][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 20.225431][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.225434][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 20.225437][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 20.225440][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   25.523437][    C3] INFO: lockdep is turned off.
| [   25.523631][    C3] Preemption disabled at:
| [ 25.523633][ C3] 0x0 
| [   25.524007][    C3] Tainted: [W]=WARN
[   25.524009][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   25.524011][    C3] Call Trace:
[   25.524013][    C3]  <IRQ>
[ 25.524016][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 25.524027][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 25.524036][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 25.524042][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 25.524045][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 25.524051][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.524058][ 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) 
[ 25.524065][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 25.524068][ 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) 
[ 25.524072][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 25.524078][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 25.524082][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 25.524090][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 25.524093][ 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) 
[ 25.524101][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.524105][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 25.524108][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 25.524115][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 25.524121][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.524126][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 25.524129][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 25.524132][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.524135][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.524139][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 25.524142][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.524144][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.524149][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 25.524156][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 25.524162][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 25.524167][ C3] __put_net (net/core/net_namespace.c:732) 
[ 25.524171][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 25.524175][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.524178][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 25.524182][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 25.524186][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 25.524193][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 25.524200][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 25.524206][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 25.524211][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 25.524214][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 25.524218][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   25.524222][    C3]  </IRQ>
[   25.524223][    C3]  <TASK>
[ 25.524225][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 25.524227][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 25.524234][ 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
[   25.524238][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000246
[   25.524244][    C3] RAX: 0000000000000003 RBX: 1ffff9200002afc1 RCX: ffffffff9018f5d9
[   25.524248][    C3] RDX: ffffed1006c366fb RSI: ffffffff90453b60 RDI: ffffffff8d98d18f
[   25.524251][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c366fa
[   25.524254][    C3] R10: ffff8880361b37d3 R11: ffff888005ff2818 R12: 0000000000000000
[   25.524257][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 25.524261][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 25.524264][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.524269][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 25.524271][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 25.524274][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 25.524277][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 25.524281][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 25.524286][ C3] do_idle (kernel/sched/idle.c:325) 
[ 25.524289][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 25.524292][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 25.524295][ 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