======================================
| [   14.844195][    C1] 1 lock held by swapper/1/0:
| [ 14.844385][ C1] #0: ffffffff8db74480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   14.844724][    C1]
| [   14.844724][    C1] stack backtrace:
[   14.844960][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.844962][    C1] Call Trace:
[   14.844964][    C1]  <IRQ>
[ 14.844967][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.844973][ C1] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 14.844978][ C1] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 14.844983][ C1] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 14.844990][ C1] ? save_trace (kernel/locking/lockdep.c:594) 
[ 14.844994][ C1] mark_lock (kernel/locking/lockdep.c:4754) 
[ 14.844998][ C1] mark_usage (kernel/locking/lockdep.c:4643) 
[ 14.845002][ C1] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 14.845007][ C1] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 14.845011][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.845015][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.845022][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 14.845025][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.845029][ C1] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 14.845032][ C1] ? simple_pin_fs (fs/libfs.c:1066) 
[ 14.845036][ C1] simple_pin_fs (fs/libfs.c:1066) 
[ 14.845040][ C1] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 14.845043][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.845049][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.845052][ 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:2333) 
[ 14.845059][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.845062][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.845065][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.845067][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.845073][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.845078][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.845081][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.845083][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.845085][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.845089][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 14.845092][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.845095][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.845100][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.845107][ C1] __put_net (net/core/net_namespace.c:732) 
[ 14.845111][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.845115][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.845118][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.845122][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.845126][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.845129][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.845133][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.845136][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.845141][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.845144][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 14.845149][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.845151][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.845153][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.845156][    C1]  </IRQ>
[   14.845157][    C1]  <TASK>
[ 14.845159][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.845162][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.845166][ C1] Code: b0 b8 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 a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   14.845169][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000242
[   14.845173][    C1] RAX: 0000000000073183 RBX: 1ffff92000026fc1 RCX: ffffffff8cb55a19
[   14.845175][    C1] RDX: 0000000000000000 RSI: ffffffff8d685f31 RDI: ffffffff8ce50ce0
[   14.845177][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c1667a
[   14.845179][    C1] R10: ffff8880360b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.845180][    C1] R13: ffff888001bb0040 R14: dffffc0000000000 R15: 0000000000000000
[ 14.845184][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.845190][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.845192][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.845194][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.845198][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.845202][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.845206][ C1] do_idle (kernel/sched/idle.c:325) 
[ 14.845210][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.845214][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.845217][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.845222][ C1] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   14.860629][    C1] RCU nest depth: 0, expected: 0
| [   14.860799][    C1] INFO: lockdep is turned off.
| [   14.860966][    C1] Preemption disabled at:
| [ 14.860968][ C1] 0x0 
[   14.861269][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.861271][    C1] Call Trace:
[   14.861273][    C1]  <IRQ>
[ 14.861275][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 14.861282][ C1] __might_resched (kernel/sched/core.c:8819) 
[ 14.861289][ C1] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 14.861294][ C1] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 14.861297][ C1] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 14.861301][ C1] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 14.861308][ 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) 
[ 14.861313][ C1] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 14.861316][ C1] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 14.861320][ 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) 
[ 14.861324][ C1] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 14.861327][ C1] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 14.861332][ C1] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 14.861334][ 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:2333) 
[ 14.861340][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.861344][ C1] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 14.861347][ C1] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 14.861350][ C1] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 14.861355][ C1] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.861359][ C1] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.861362][ C1] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.861364][ C1] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.861367][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.861372][ C1] ? do_idle (kernel/sched/idle.c:325) 
[ 14.861375][ C1] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.861378][ C1] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.861383][ C1] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 14.861389][ C1] __put_net (net/core/net_namespace.c:732) 
[ 14.861392][ C1] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 14.861396][ C1] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.861399][ C1] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 14.861403][ C1] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 14.861407][ C1] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 14.861411][ C1] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 14.861416][ C1] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 14.861419][ C1] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 14.861424][ C1] rcu_core (kernel/rcu/tree.c:2826) 
[ 14.861427][ C1] handle_softirqs (kernel/softirq.c:579) 
[ 14.861432][ C1] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 14.861434][ C1] irq_exit_rcu (kernel/softirq.c:698) 
[ 14.861437][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   14.861440][    C1]  </IRQ>
[   14.861441][    C1]  <TASK>
[ 14.861442][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 14.861445][ C1] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 14.861449][ C1] Code: b0 b8 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 a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   14.861451][    C1] RSP: 0018:ffffc90000137de8 EFLAGS: 00000242
[   14.861454][    C1] RAX: 0000000000073183 RBX: 1ffff92000026fc1 RCX: ffffffff8cb55a19
[   14.861456][    C1] RDX: 0000000000000000 RSI: ffffffff8d685f31 RDI: ffffffff8ce50ce0
[   14.861458][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c1667a
[   14.861460][    C1] R10: ffff8880360b33d3 R11: 0000000000000000 R12: 0000000000000000
[   14.861462][    C1] R13: ffff888001bb0040 R14: dffffc0000000000 R15: 0000000000000000
[ 14.861465][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 14.861471][ C1] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 14.861473][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 14.861475][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 14.861479][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 14.861483][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 14.861488][ C1] do_idle (kernel/sched/idle.c:325) 
[ 14.861492][ C1] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 14.861496][ C1] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 14.861499][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 14.861504][ C1] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.611670][    C2] INFO: lockdep is turned off.
| [   16.611857][    C2] Preemption disabled at:
| [ 16.611859][ C2] 0x0 
| [   16.612188][    C2] Tainted: [W]=WARN
[   16.612189][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.612191][    C2] Call Trace:
[   16.612193][    C2]  <IRQ>
[ 16.612195][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.612206][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 16.612215][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.612220][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.612222][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.612229][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.612238][ 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) 
[ 16.612244][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.612246][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.612252][ 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) 
[ 16.612257][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.612259][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.612266][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.612269][ 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:2333) 
[ 16.612277][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.612282][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.612285][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.612290][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.612297][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.612301][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.612304][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.612307][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.612309][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.612315][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 16.612318][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.612321][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.612329][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.612335][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 16.612339][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.612344][ C2] __put_net (net/core/net_namespace.c:732) 
[ 16.612348][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 16.612351][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.612354][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.612359][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.612363][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 16.612368][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.612374][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.612378][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 16.612383][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.612385][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.612387][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.612391][    C2]  </IRQ>
[   16.612392][    C2]  <TASK>
[ 16.612393][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.612396][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.612400][ C2] Code: b0 b8 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 a3 d0 13 00 fb f4 <c3> cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
All code
========
   0:	b0 b8                	mov    $0xb8,%al
   2:	00 c3                	add    %al,%bl
   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 a3 d0 13 00 	verw   0x13d0a3(%rip)        # 0x13d0cb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	cc                   	int3
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  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:	c3                   	ret
   1:	cc                   	int3
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   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
[   16.612403][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   16.612407][    C2] RAX: 0000000000000002 RBX: 1ffff92000028fc1 RCX: ffffffff8cb55a19
[   16.612409][    C2] RDX: ffffed1006c2667b RSI: ffffffff8ce50c60 RDI: ffffffff8a384d8f
[   16.612411][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffed1006c2667a
[   16.612412][    C2] R10: ffff8880361333d3 R11: ffff888001d5a858 R12: 0000000000000000
[   16.612414][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 16.612418][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.612422][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.612426][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.612428][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.612431][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.612435][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.612439][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.612444][ C2] do_idle (kernel/sched/idle.c:325) 
[ 16.612448][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.612451][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.612455][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 


Finger prints:
mark_lock_irq:mark_lock:mark_usage:__lock_acquire:_raw_spin_lock
__might_resched:down_write:simple_recursive_removal:debugfs_remove:ref_tracker_dir_exit