======================================
| [   15.721026][    C1] 1 lock held by ksoftirqd/1/22:
| [ 15.721248][ C1] #0: ffffffffa75774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   15.721600][    C1]
| [   15.721600][    C1] stack backtrace:
[   15.721841][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.721843][    C1] Call Trace:
[   15.721846][    C1]  <TASK>
[ 15.721849][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.721856][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 15.721861][ C1] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 15.721865][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 15.721872][ C1] ? save_trace (kernel/locking/lockdep.c:595) 
[ 15.721879][ C1] mark_lock (kernel/locking/lockdep.c:4756) 
[ 15.721883][ C1] mark_usage (kernel/locking/lockdep.c:4645) 
[ 15.721886][ C1] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 15.721889][ C1] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 15.721893][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 15.721896][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.721900][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.721906][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 15.721908][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.721913][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 15.721917][ C1] ? simple_pin_fs (fs/libfs.c:1067) 
[ 15.721920][ C1] simple_pin_fs (fs/libfs.c:1067) 
[ 15.721924][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 15.721927][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.721935][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.721939][ C1] ? __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) 
[ 15.721946][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.721949][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.721952][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.721959][ C1] ? kthread (kernel/kthread.c:464) 
[ 15.721962][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.721965][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.721968][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 15.721974][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.721979][ C1] __put_net (net/core/net_namespace.c:732) 
[ 15.721984][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.721988][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.721991][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.721995][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.721999][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.722001][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.722005][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.722010][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.722014][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 15.722018][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.722022][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.722024][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.722028][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.722032][ C1] kthread (kernel/kthread.c:464) 
[ 15.722035][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.722037][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.722039][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.722043][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.722046][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.722049][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.722051][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.722054][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.733855][    C1] RCU nest depth: 0, expected: 0
| [   15.734031][    C1] INFO: lockdep is turned off.
| [   15.734205][    C1] Preemption disabled at:
| [ 15.734207][ C1] handle_softirqs (kernel/softirq.c:553) 
[   15.734567][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.734569][    C1] Call Trace:
[   15.734571][    C1]  <TASK>
[ 15.734573][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.734581][ C1] __might_resched (kernel/sched/core.c:8796) 
[ 15.734589][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.734594][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.734597][ C1] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.734601][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.734606][ C1] ? 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) 
[ 15.734613][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.734616][ C1] ? 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) 
[ 15.734619][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.734624][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.734627][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 15.734633][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 15.734637][ C1] ? __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) 
[ 15.734642][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.734646][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 15.734649][ C1] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.734654][ C1] ? kthread (kernel/kthread.c:464) 
[ 15.734657][ C1] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.734660][ C1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 15.734666][ C1] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 15.734671][ C1] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 15.734676][ C1] __put_net (net/core/net_namespace.c:732) 
[ 15.734682][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.734686][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.734689][ C1] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.734693][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.734697][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.734700][ C1] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 15.734702][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 15.734707][ C1] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.734711][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 15.734715][ C1] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 15.734719][ C1] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 15.734722][ C1] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 15.734725][ C1] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 15.734729][ C1] kthread (kernel/kthread.c:464) 
[ 15.734732][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.734734][ C1] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 15.734737][ C1] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 15.734740][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.734743][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.734746][ C1] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 15.734749][ C1] ? __pfx_kthread (kernel/kthread.c:413) 
[ 15.734751][ C1] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   17.745005][    C2] INFO: lockdep is turned off.
| [   17.745276][    C2] Preemption disabled at:
| [ 17.745279][ C2] 0x0 
| [   17.745782][    C2] Tainted: [W]=WARN
[   17.745785][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.745787][    C2] Call Trace:
[   17.745791][    C2]  <IRQ>
[ 17.745794][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.745810][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 17.745825][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.745834][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.745837][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 17.745846][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.745856][ 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) 
[ 17.745867][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 17.745871][ 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) 
[ 17.745876][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.745887][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.745892][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:412 lib/ref_tracker.c:196) 
[ 17.745900][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:254) 
[ 17.745905][ 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) 
[ 17.745914][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.745920][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:190) 
[ 17.745925][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.745934][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 17.745941][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.745947][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 17.745952][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 17.745956][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.745959][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.745965][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 17.745968][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.745972][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.745977][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.745982][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 17.745987][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 17.745994][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.746000][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 17.746006][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.746010][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 17.746017][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 17.746022][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 17.746030][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.746040][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 17.746047][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.746056][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.746059][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.746064][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   17.746070][    C2]  </IRQ>
[   17.746071][    C2]  <TASK>
[ 17.746073][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.746078][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 17.746083][ C2] Code: 92 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 37 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:	92                   	xchg   %eax,%edx
   1:	b5 00                	mov    $0x0,%ch
   3:	c3                   	ret
   4:	cc                   	int3
   5:	cc                   	int3
   6:	cc                   	int3
   7:	cc                   	int3
   8:	0f 1f 00             	nopl   (%rax)
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  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 37 10 00 	verw   0x103783(%rip)        # 0x1037ab
  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
[   17.746087][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   17.746092][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffffa65905d9
[   17.746095][    C2] RDX: ffffed1006c266fb RSI: ffffffffa6853b60 RDI: ffffffffa3d8d18f
[   17.746097][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   17.746100][    C2] R10: ffff8880361337d3 R11: ffffffffa9e70108 R12: 0000000000000000
[   17.746103][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 17.746110][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.746115][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.746121][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 17.746125][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.746129][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.746133][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.746139][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 17.746144][ C2] do_idle (kernel/sched/idle.c:325) 
[ 17.746149][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.746154][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.746158][ 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