======================================
| [   22.061395][    C2] 1 lock held by ksoftirqd/2/27:
| [ 22.061623][ C2] #0: ffffffffba5774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   22.061966][    C2]
| [   22.061966][    C2] stack backtrace:
[   22.062212][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   22.062214][    C2] Call Trace:
[   22.062216][    C2]  <TASK>
[ 22.062220][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 22.062226][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 22.062232][ C2] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 22.062236][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 22.062241][ C2] ? save_trace (kernel/locking/lockdep.c:595) 
[ 22.062246][ C2] mark_lock (kernel/locking/lockdep.c:4756) 
[ 22.062250][ C2] mark_usage (kernel/locking/lockdep.c:4645) 
[ 22.062253][ C2] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 22.062256][ C2] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 22.062260][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 22.062264][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 22.062268][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.062272][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 22.062275][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 22.062280][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 22.062283][ C2] ? simple_pin_fs (fs/libfs.c:1067) 
[ 22.062287][ C2] simple_pin_fs (fs/libfs.c:1067) 
[ 22.062291][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 22.062294][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 22.062300][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 22.062304][ 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) 
[ 22.062310][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.062313][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 22.062316][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 22.062321][ C2] ? kthread (kernel/kthread.c:464) 
[ 22.062323][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 22.062327][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 22.062331][ 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) 
[ 22.062335][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 22.062341][ C2] __put_net (net/core/net_namespace.c:732) 
[ 22.062345][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 22.062349][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.062351][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.062354][ C2] ? __schedule (kernel/sched/core.c:6658) 
[ 22.062360][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 22.062364][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.062367][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 22.062370][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 22.062374][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 22.062378][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 22.062383][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 22.062386][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 22.062389][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 22.062393][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 22.062397][ C2] kthread (kernel/kthread.c:464) 
[ 22.062400][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 22.062402][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 22.062404][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 22.062408][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.062411][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 22.062414][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 22.062416][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 22.062418][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   22.075446][    C2] RCU nest depth: 0, expected: 0
| [   22.075657][    C2] INFO: lockdep is turned off.
| [   22.075978][    C2] Preemption disabled at:
| [ 22.075979][ C2] handle_softirqs (kernel/softirq.c:553) 
[   22.076502][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   22.076504][    C2] Call Trace:
[   22.076506][    C2]  <TASK>
[ 22.076509][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 22.076515][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 22.076522][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 22.076527][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 22.076530][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 22.076534][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.076538][ 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) 
[ 22.076545][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 22.076547][ 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) 
[ 22.076551][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 22.076557][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 22.076560][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 22.076565][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 22.076569][ 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) 
[ 22.076574][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.076577][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 22.076580][ C2] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 22.076584][ C2] ? kthread (kernel/kthread.c:464) 
[ 22.076587][ C2] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 22.076591][ C2] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 22.076596][ 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) 
[ 22.076600][ C2] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 22.076605][ C2] __put_net (net/core/net_namespace.c:732) 
[ 22.076609][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 22.076613][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.076616][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 22.076619][ C2] ? __schedule (kernel/sched/core.c:6658) 
[ 22.076625][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 22.076628][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.076631][ C2] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 22.076634][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 22.076638][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 22.076642][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 22.076646][ C2] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 22.076650][ C2] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 22.076653][ C2] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 22.076656][ C2] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 22.076660][ C2] kthread (kernel/kthread.c:464) 
[ 22.076663][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 22.076665][ C2] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 22.076668][ C2] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 22.076671][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 22.076674][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 22.076678][ C2] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 22.076680][ C2] ? __pfx_kthread (kernel/kthread.c:413) 
[ 22.076683][ C2] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   28.215372][    C2] INFO: lockdep is turned off.
| [   28.215571][    C2] Preemption disabled at:
| [ 28.215573][ C2] 0x0 
| [   28.215959][    C2] Tainted: [W]=WARN
[   28.215960][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   28.215962][    C2] Call Trace:
[   28.215964][    C2]  <IRQ>
[ 28.215966][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 28.215975][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 28.215983][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 28.215987][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 28.215990][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 28.215994][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.215999][ 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) 
[ 28.216005][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 28.216008][ 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) 
[ 28.216011][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 28.216017][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 28.216020][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 28.216026][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 28.216029][ 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) 
[ 28.216034][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.216038][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 28.216041][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 28.216046][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 28.216051][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 28.216055][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 28.216058][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 28.216061][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 28.216064][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 28.216067][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 28.216069][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 28.216072][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 28.216075][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 28.216081][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 28.216085][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 28.216089][ C2] __put_net (net/core/net_namespace.c:732) 
[ 28.216093][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 28.216097][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.216099][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 28.216104][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 28.216107][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 28.216113][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 28.216119][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 28.216124][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 28.216129][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 28.216133][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 28.216135][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   28.216139][    C2]  </IRQ>
[   28.216140][    C2]  <TASK>
[ 28.216142][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 28.216144][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 28.216149][ 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
[   28.216152][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   28.216155][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffb958f5d9
[   28.216158][    C2] RDX: ffffed1006c266fb RSI: ffffffffb9853b60 RDI: ffffffffb6d8d18f
[   28.216159][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   28.216161][    C2] R10: ffff8880361337d3 R11: ffff888002104ad8 R12: 0000000000000000
[   28.216163][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 28.216167][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 28.216170][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 28.216174][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 28.216176][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 28.216179][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 28.216182][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 28.216186][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 28.216190][ C2] do_idle (kernel/sched/idle.c:325) 
[ 28.216193][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 28.216196][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 28.216199][ 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