======================================
| [   12.694721][    C0] 1 lock held by swapper/0/0:
| [ 12.694943][ C0] #0: ffffffffb2b774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   12.695334][    C0]
| [   12.695334][    C0] stack backtrace:
[   12.695614][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.695616][    C0] Call Trace:
[   12.695618][    C0]  <IRQ>
[ 12.695620][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.695626][ C0] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 12.695631][ C0] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 12.695635][ C0] ? is_bpf_text_address (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 kernel/bpf/core.c:774) 
[ 12.695640][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.695645][ C0] ? save_trace (kernel/locking/lockdep.c:595) 
[ 12.695649][ C0] mark_lock (kernel/locking/lockdep.c:4756) 
[ 12.695653][ C0] mark_usage (kernel/locking/lockdep.c:4645) 
[ 12.695656][ C0] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 12.695659][ C0] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 12.695664][ C0] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 12.695667][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.695670][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.695676][ C0] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 12.695678][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.695682][ C0] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 12.695685][ C0] ? simple_pin_fs (fs/libfs.c:1067) 
[ 12.695688][ C0] simple_pin_fs (fs/libfs.c:1067) 
[ 12.695691][ C0] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 12.695694][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 12.695699][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 12.695702][ C0] ? __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) 
[ 12.695707][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.695710][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 12.695713][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.695716][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.695720][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.695724][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.695727][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.695730][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.695732][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.695736][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.695739][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.695741][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.695744][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.695750][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.695754][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.695758][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.695761][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.695766][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.695769][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.695773][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.695776][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.695781][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.695786][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.695791][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.695794][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.695798][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.695801][    C0]  </IRQ>
[   12.695802][    C0]  <TASK>
[ 12.695804][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.695806][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.695811][ C0] Code: a2 b4 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 17 0f 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 b4 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b4
   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 17 0f 00 	verw   0xf1783(%rip)        # 0xf17ab
  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
[   12.695813][    C0] RSP: 0018:ffffffffb2807df8 EFLAGS: 00000246
[   12.695817][    C0] RAX: 000000000006455f RBX: 1ffffffff6500fc3 RCX: ffffffffb1ba25d9
[   12.695819][    C0] RDX: 0000000000000000 RSI: ffffffffb269175c RDI: ffffffffb1e53ca0
[   12.695821][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[   12.695822][    C0] R10: ffff8880360337d3 R11: ffffffffb2811288 R12: 0000000000000000
[   12.695824][    C0] R13: ffffffffb281f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.695828][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.695832][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.695835][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.695837][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.695840][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.695844][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.695849][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.695853][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.695856][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.695860][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.695863][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.695868][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 
[ 12.695872][ C0] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   12.715323][    C0] RCU nest depth: 0, expected: 0
| [   12.715528][    C0] INFO: lockdep is turned off.
| [   12.715735][    C0] Preemption disabled at:
| [ 12.715737][ C0] schedule_preempt_disabled (kernel/sched/core.c:6933) 
[   12.716353][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   12.716355][    C0] Call Trace:
[   12.716356][    C0]  <IRQ>
[ 12.716358][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 12.716364][ C0] __might_resched (kernel/sched/core.c:8796) 
[ 12.716371][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 12.716375][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 12.716377][ C0] ? simple_recursive_removal (fs/libfs.c:614) 
[ 12.716382][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.716388][ C0] ? 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) 
[ 12.716392][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 12.716395][ C0] ? 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) 
[ 12.716397][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 12.716403][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 12.716407][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 12.716411][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 12.716414][ C0] ? __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) 
[ 12.716418][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.716422][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 12.716425][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 12.716430][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 12.716434][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.716438][ C0] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.716441][ C0] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.716444][ C0] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.716446][ C0] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.716450][ C0] ? do_idle (kernel/sched/idle.c:325) 
[ 12.716453][ C0] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.716456][ C0] ? rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.716458][ C0] ? start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.716466][ C0] __put_net (net/core/net_namespace.c:732) 
[ 12.716470][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 12.716474][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.716477][ C0] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 12.716482][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 12.716485][ C0] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 12.716490][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 12.716493][ C0] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 12.716499][ C0] rcu_core (kernel/rcu/tree.c:2834) 
[ 12.716504][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 12.716509][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 12.716512][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 12.716516][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   12.716519][    C0]  </IRQ>
[   12.716520][    C0]  <TASK>
[ 12.716522][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 12.716524][ C0] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 12.716528][ C0] Code: a2 b4 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 17 0f 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 b4 00 c3 cc cc cc 	movabs %al,0xfccccccccc300b4
   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 17 0f 00 	verw   0xf1783(%rip)        # 0xf17ab
  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
[   12.716531][    C0] RSP: 0018:ffffffffb2807df8 EFLAGS: 00000246
[   12.716534][    C0] RAX: 000000000006455f RBX: 1ffffffff6500fc3 RCX: ffffffffb1ba25d9
[   12.716536][    C0] RDX: 0000000000000000 RSI: ffffffffb269175c RDI: ffffffffb1e53ca0
[   12.716537][    C0] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c066fa
[   12.716539][    C0] R10: ffff8880360337d3 R11: ffffffffb2811288 R12: 0000000000000000
[   12.716541][    C0] R13: ffffffffb281f240 R14: dffffc0000000000 R15: 0000000000014770
[ 12.716544][ C0] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 12.716549][ C0] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 12.716551][ C0] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 12.716554][ C0] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 12.716557][ C0] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 12.716561][ C0] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 12.716567][ C0] do_idle (kernel/sched/idle.c:325) 
[ 12.716571][ C0] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 12.716574][ C0] rest_init (./include/linux/rcupdate.h:842 init/main.c:714) 
[ 12.716577][ C0] start_kernel (init/main.c:1049 (discriminator 1)) 
[ 12.716581][ C0] x86_64_start_reservations (arch/x86/kernel/head64.c:295) 
[ 12.716585][ C0] x86_64_start_kernel (arch/x86/kernel/head64.c:231 (discriminator 17)) 


Finger prints:
schedule_preempt_disabled:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock