======================================
| [   14.334167][    C3] 1 lock held by ksoftirqd/3/32:
| [ 14.334341][ C3] #0: ffffffff911774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   14.334647][    C3]
| [   14.334647][    C3] stack backtrace:
[   14.334864][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.334867][    C3] Call Trace:
[   14.334869][    C3]  <TASK>
[ 14.334871][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.334877][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 14.334881][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 14.334886][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.334890][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 14.334897][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 14.334901][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 14.334904][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 14.334907][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 14.334911][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 14.334914][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.334918][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.334922][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 14.334925][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.334929][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.334933][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 14.334936][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 14.334940][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.334943][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.334949][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.334953][ 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) 
[ 14.334958][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.334961][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.334964][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.334969][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.334972][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.334974][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.334978][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 14.334981][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.334987][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.334991][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.334995][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.334998][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.335002][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.335006][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.335008][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.335011][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.335016][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.335020][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.335024][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.335027][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.335030][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.335034][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.335038][ C3] kthread (kernel/kthread.c:464) 
[ 14.335041][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.335043][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.335045][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.335048][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.335051][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.335054][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.335057][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.335059][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   14.345358][    C3] RCU nest depth: 0, expected: 0
| [   14.345513][    C3] INFO: lockdep is turned off.
| [   14.345668][    C3] Preemption disabled at:
| [ 14.345670][ C3] handle_softirqs (kernel/softirq.c:553) 
[   14.345993][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.345995][    C3] Call Trace:
[   14.345996][    C3]  <TASK>
[ 14.345998][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.346004][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 14.346011][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.346015][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.346017][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 14.346021][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.346024][ 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) 
[ 14.346030][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 14.346032][ 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) 
[ 14.346036][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.346041][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.346044][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 14.346049][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.346052][ 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) 
[ 14.346056][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.346059][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.346062][ C3] ? smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.346065][ C3] ? kthread (kernel/kthread.c:464) 
[ 14.346068][ C3] ? ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.346071][ C3] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
[ 14.346074][ C3] ? migrate_enable (./arch/x86/include/asm/preempt.h:104 ./include/linux/preempt.h:481 ./include/linux/preempt.h:481 kernel/sched/core.c:2427) 
[ 14.346078][ C3] ? __pfx_migrate_enable (kernel/sched/core.c:2402) 
[ 14.346084][ C3] __put_net (net/core/net_namespace.c:732) 
[ 14.346087][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 14.346091][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.346093][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 14.346098][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 14.346101][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.346104][ C3] ? note_gp_changes (kernel/rcu/tree.c:1326 (discriminator 1)) 
[ 14.346107][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4475) 
[ 14.346111][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 14.346115][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 14.346119][ C3] ? __pfx_run_ksoftirqd (kernel/softirq.c:961) 
[ 14.346122][ C3] run_ksoftirqd (kernel/softirq.c:436 kernel/softirq.c:969 kernel/softirq.c:960) 
[ 14.346125][ C3] smpboot_thread_fn (kernel/smpboot.c:164 (discriminator 3)) 
[ 14.346129][ C3] ? __pfx_smpboot_thread_fn (kernel/smpboot.c:107) 
[ 14.346133][ C3] kthread (kernel/kthread.c:464) 
[ 14.346135][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.346138][ C3] ? ret_from_fork (arch/x86/kernel/process.c:147) 
[ 14.346140][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 14.346144][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 14.346147][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.346149][ C3] ret_from_fork (arch/x86/kernel/process.c:148) 
[ 14.346152][ C3] ? __pfx_kthread (kernel/kthread.c:413) 
[ 14.346155][ C3] ret_from_fork_asm (arch/x86/entry/entry_64.S:258) 
| [   15.927659][    C2] INFO: lockdep is turned off.
| [   15.927846][    C2] Preemption disabled at:
| [ 15.927848][ C2] 0x0 
| [   15.928199][    C2] Tainted: [W]=WARN
[   15.928200][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   15.928202][    C2] Call Trace:
[   15.928204][    C2]  <IRQ>
[ 15.928206][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 15.928214][ C2] __might_resched (kernel/sched/core.c:8796) 
[ 15.928221][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 15.928226][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 15.928229][ C2] ? simple_recursive_removal (fs/libfs.c:614) 
[ 15.928233][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.928239][ 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) 
[ 15.928245][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 15.928248][ 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) 
[ 15.928251][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 15.928256][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 15.928259][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 15.928265][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 15.928268][ 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) 
[ 15.928274][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.928277][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 15.928280][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 15.928285][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 15.928290][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.928293][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.928297][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.928300][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.928302][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.928306][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 15.928308][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.928311][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.928315][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 15.928320][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 15.928324][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 15.928328][ C2] __put_net (net/core/net_namespace.c:732) 
[ 15.928333][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 15.928337][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.928339][ C2] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 15.928344][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 15.928348][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 15.928353][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 15.928359][ C2] rcu_core (kernel/rcu/tree.c:2834) 
[ 15.928365][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 15.928370][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 15.928373][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 15.928376][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   15.928380][    C2]  </IRQ>
[   15.928381][    C2]  <TASK>
[ 15.928382][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 15.928385][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 15.928390][ 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
[   15.928392][    C2] RSP: 0000:ffffc90000147de8 EFLAGS: 00000246
[   15.928397][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff9018f5d9
[   15.928399][    C2] RDX: ffffed1006c266fb RSI: ffffffff90453b60 RDI: ffffffff8d98d18f
[   15.928400][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c266fa
[   15.928402][    C2] R10: ffff8880361337d3 R11: ffff888001ee2818 R12: 0000000000000000
[   15.928404][    C2] R13: ffff888001bf2300 R14: dffffc0000000000 R15: 0000000000000000
[ 15.928408][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 15.928411][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.928415][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 15.928417][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 15.928420][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 15.928423][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 15.928427][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 15.928431][ C2] do_idle (kernel/sched/idle.c:325) 
[ 15.928435][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 15.928438][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 15.928440][ 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