======================================
| [   13.146393][    C3] 1 lock held by swapper/3/0:
| [ 13.146597][ C3] #0: ffffffff9fb774c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2570) 
| [   13.146958][    C3]
| [   13.146958][    C3] stack backtrace:
[   13.147217][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.147220][    C3] Call Trace:
[   13.147222][    C3]  <IRQ>
[ 13.147224][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.147230][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4048) 
[ 13.147236][ C3] mark_lock_irq (kernel/locking/lockdep.c:4013 kernel/locking/lockdep.c:4059 kernel/locking/lockdep.c:4270) 
[ 13.147241][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 13.147246][ C3] ? save_trace (kernel/locking/lockdep.c:595) 
[ 13.147250][ C3] mark_lock (kernel/locking/lockdep.c:4756) 
[ 13.147254][ C3] mark_usage (kernel/locking/lockdep.c:4645) 
[ 13.147257][ C3] __lock_acquire (kernel/locking/lockdep.c:5194) 
[ 13.147260][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5240) 
[ 13.147265][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) 
[ 13.147268][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.147272][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.147278][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5834) 
[ 13.147281][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.147284][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 13.147288][ C3] ? simple_pin_fs (fs/libfs.c:1067) 
[ 13.147290][ C3] simple_pin_fs (fs/libfs.c:1067) 
[ 13.147293][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 13.147297][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.147302][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.147304][ 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) 
[ 13.147310][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.147313][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.147315][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.147318][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 13.147323][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.147327][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.147330][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.147333][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.147335][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.147339][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.147342][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.147344][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.147348][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.147356][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.147359][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.147364][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.147366][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.147371][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.147375][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.147379][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.147382][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.147387][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.147391][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.147397][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.147400][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.147403][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   13.147407][    C3]  </IRQ>
[   13.147408][    C3]  <TASK>
[ 13.147410][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.147412][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.147416][ C3] 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
[   13.147419][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.147422][    C3] RAX: 0000000000037301 RBX: 1ffff9200002afc1 RCX: ffffffff9eba25d9
[   13.147424][    C3] RDX: 0000000000000000 RSI: ffffffff9f69175c RDI: ffffffff9ee53ca0
[   13.147426][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005eb66fa
[   13.147428][    C3] R10: ffff88802f5b37d3 R11: ffffffff9f811288 R12: 0000000000000000
[   13.147429][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 13.147433][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.147438][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.147440][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.147443][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.147446][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.147450][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 13.147455][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.147459][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.147462][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.147465][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 13.147470][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   13.165400][    C3] RCU nest depth: 0, expected: 0
| [   13.165594][    C3] INFO: lockdep is turned off.
| [   13.165781][    C3] Preemption disabled at:
| [ 13.165782][ C3] 0x0 
[   13.166122][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   13.166124][    C3] Call Trace:
[   13.166125][    C3]  <IRQ>
[ 13.166127][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 13.166135][ C3] __might_resched (kernel/sched/core.c:8796) 
[ 13.166143][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 13.166147][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 13.166150][ C3] ? simple_recursive_removal (fs/libfs.c:614) 
[ 13.166155][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.166160][ 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) 
[ 13.166164][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:617) 
[ 13.166167][ 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) 
[ 13.166169][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 13.166175][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 13.166178][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:411 lib/ref_tracker.c:195) 
[ 13.166182][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 13.166185][ 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) 
[ 13.166189][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.166194][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 13.166196][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 13.166201][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[ 13.166204][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.166208][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.166211][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.166214][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.166216][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.166220][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 13.166223][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.166225][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.166229][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 13.166236][ C3] __put_net (net/core/net_namespace.c:732) 
[ 13.166240][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2376) 
[ 13.166244][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.166247][ C3] rcu_do_batch (kernel/rcu/tree.c:2576) 
[ 13.166252][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2500) 
[ 13.166256][ C3] ? __lock_release (kernel/locking/lockdep.c:5539) 
[ 13.166261][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:745) 
[ 13.166264][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 13.166270][ C3] rcu_core (kernel/rcu/tree.c:2834) 
[ 13.166274][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 13.166279][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 13.166283][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 13.166286][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 arch/x86/kernel/apic/apic.c:1050) 
[   13.166289][    C3]  </IRQ>
[   13.166291][    C3]  <TASK>
[ 13.166292][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 13.166295][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:82) 
[ 13.166299][ C3] 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
[   13.166301][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   13.166304][    C3] RAX: 0000000000037301 RBX: 1ffff9200002afc1 RCX: ffffffff9eba25d9
[   13.166306][    C3] RDX: 0000000000000000 RSI: ffffffff9f69175c RDI: ffffffff9ee53ca0
[   13.166308][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1005eb66fa
[   13.166310][    C3] R10: ffff88802f5b37d3 R11: ffffffff9f811288 R12: 0000000000000000
[   13.166311][    C3] R13: ffff888001bf45c0 R14: dffffc0000000000 R15: 0000000000000000
[ 13.166315][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 13.166320][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:743) 
[ 13.166322][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 13.166325][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 13.166328][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 13.166332][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:60) 
[ 13.166337][ C3] do_idle (kernel/sched/idle.c:325) 
[ 13.166341][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 13.166344][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 13.166347][ 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