======================================
| [   17.454971][    C2] 1 lock held by swapper/2/0:
| [ 17.455183][ C2] #0: ffffffffb4174480 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   17.455557][    C2]
| [   17.455557][    C2] stack backtrace:
[   17.455822][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.455825][    C2] Call Trace:
[   17.455827][    C2]  <IRQ>
[ 17.455830][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.455837][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 17.455844][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 17.455849][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.455855][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 17.455860][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 17.455864][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 17.455868][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 17.455873][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 17.455877][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.455883][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.455890][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.455893][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.455897][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.455901][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.455905][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 17.455909][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.455913][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.455919][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.455922][ 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) 
[ 17.455927][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.455930][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.455933][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.455936][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.455941][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.455946][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.455949][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.455951][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.455953][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.455960][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 17.455962][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.455966][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.455971][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.455979][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.455983][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.455986][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.455989][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.455993][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.455997][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.456001][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.456004][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.456008][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.456012][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.456016][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.456021][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.456024][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.456026][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.456029][    C2]  </IRQ>
[   17.456031][    C2]  <TASK>
[ 17.456032][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.456035][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.456040][ 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
[   17.456043][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   17.456047][    C2] RAX: 000000000004fc27 RBX: 1ffff92000028fc1 RCX: ffffffffb3155a19
[   17.456049][    C2] RDX: 0000000000000000 RSI: ffffffffb3c85f31 RDI: ffffffffb3450ce0
[   17.456051][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   17.456053][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   17.456055][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 17.456059][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.456065][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.456067][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.456069][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.456074][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.456078][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.456083][ C2] do_idle (kernel/sched/idle.c:325) 
[ 17.456087][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.456091][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.456094][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.456099][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.473206][    C2] RCU nest depth: 0, expected: 0
| [   17.473411][    C2] INFO: lockdep is turned off.
| [   17.473620][    C2] Preemption disabled at:
| [ 17.473622][ C2] 0x0 
[   17.473989][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.473991][    C2] Call Trace:
[   17.473993][    C2]  <IRQ>
[ 17.473996][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.474004][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 17.474012][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.474016][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.474019][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.474024][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.474032][ 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) 
[ 17.474038][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.474041][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.474047][ 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) 
[ 17.474053][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.474057][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.474065][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.474070][ 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) 
[ 17.474076][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.474081][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.474084][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.474088][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.474094][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.474099][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.474102][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.474105][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.474107][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.474112][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 17.474115][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.474119][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.474125][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.474132][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.474136][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 17.474140][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.474143][ C2] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.474147][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.474153][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.474157][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.474161][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.474165][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.474169][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.474173][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.474180][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.474183][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.474185][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.474188][    C2]  </IRQ>
[   17.474190][    C2]  <TASK>
[ 17.474191][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.474194][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.474198][ 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
[   17.474202][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   17.474205][    C2] RAX: 000000000004fc27 RBX: 1ffff92000028fc1 RCX: ffffffffb3155a19
[   17.474207][    C2] RDX: 0000000000000000 RSI: ffffffffb3c85f31 RDI: ffffffffb3450ce0
[   17.474209][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   17.474211][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   17.474212][    C2] R13: ffff888001bb2340 R14: dffffc0000000000 R15: 0000000000000000
[ 17.474216][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.474222][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.474224][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.474226][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.474230][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.474234][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.474239][ C2] do_idle (kernel/sched/idle.c:325) 
[ 17.474243][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.474247][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.474251][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.474256][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   20.514172][    C0] INFO: lockdep is turned off.
| [   20.514387][    C0] Preemption disabled at:
| [ 20.514389][ C0] handle_softirqs (kernel/softirq.c:553) 
| [   20.514860][    C0] Tainted: [W]=WARN
[   20.514862][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.514864][    C0] Call Trace:
[   20.514866][    C0]  <IRQ>
[ 20.514868][ C0] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.514878][ C0] __might_resched (kernel/sched/core.c:8819) 
[ 20.514885][ C0] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.514892][ C0] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.514897][ C0] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 20.514905][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.514915][ 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) 
[ 20.514920][ C0] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 20.514923][ C0] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.514929][ 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) 
[ 20.514933][ C0] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.514936][ C0] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.514943][ C0] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.514946][ 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:2333) 
[ 20.514954][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.514960][ C0] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.514964][ C0] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.514968][ C0] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 20.514977][ C0] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.514984][ C0] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:482) 
[ 20.514989][ C0] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 20.514993][ C0] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 20.514997][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 20.515003][ C0] ? kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 20.515009][ C0] ? __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3084) 
[ 20.515015][ C0] ? kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 20.515020][ C0] ? exit_mmap (mm/mmap.c:1311) 
[ 20.515026][ C0] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 20.515029][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515034][ C0] __put_net (net/core/net_namespace.c:732) 
[ 20.515039][ C0] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2333) 
[ 20.515045][ C0] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.515050][ C0] rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.515059][ C0] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.515063][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515066][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 20.515073][ C0] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.515079][ C0] handle_softirqs (kernel/softirq.c:579) 
[ 20.515087][ C0] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.515091][ C0] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.515095][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   20.515098][    C0]  </IRQ>
[   20.515099][    C0]  <TASK>
[ 20.515101][ C0] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.515104][ C0] RIP: 0010:unwind_next_frame (arch/x86/kernel/unwind_orc.c:482) 
[ 20.515109][ C0] Code: 0f 85 d6 06 00 00 49 8d 45 60 48 89 c2 48 89 44 24 08 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 5a 16 00 00 <4d> 8b 7d 60 4d 85 ff 74 36 49 8d bf 88 00 00 00 48 b8 00 00 00 00
All code
========
   0:	0f 85 d6 06 00 00    	jne    0x6dc
   6:	49 8d 45 60          	lea    0x60(%r13),%rax
   a:	48 89 c2             	mov    %rax,%rdx
   d:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
  12:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  19:	fc ff df 
  1c:	48 c1 ea 03          	shr    $0x3,%rdx
  20:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
  24:	0f 85 5a 16 00 00    	jne    0x1684
  2a:*	4d 8b 7d 60          	mov    0x60(%r13),%r15		<-- trapping instruction
  2e:	4d 85 ff             	test   %r15,%r15
  31:	74 36                	je     0x69
  33:	49 8d bf 88 00 00 00 	lea    0x88(%r15),%rdi
  3a:	48                   	rex.W
  3b:	b8 00 00 00 00       	mov    $0x0,%eax

Code starting with the faulting instruction
===========================================
   0:	4d 8b 7d 60          	mov    0x60(%r13),%r15
   4:	4d 85 ff             	test   %r15,%r15
   7:	74 36                	je     0x3f
   9:	49 8d bf 88 00 00 00 	lea    0x88(%r15),%rdi
  10:	48                   	rex.W
  11:	b8 00 00 00 00       	mov    $0x0,%eax
[   20.515113][    C0] RSP: 0018:ffffc90000987798 EFLAGS: 00000246
[   20.515119][    C0] RAX: dffffc0000000000 RBX: 1ffff92000130efc RCX: 0000000000000002
[   20.515123][    C0] RDX: 1ffff92000130f1f RSI: ffffffffb3450c60 RDI: ffffffffb3cdedc0
[   20.515126][    C0] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
[   20.515129][    C0] R10: ffffffffb080b397 R11: ffffc900009878d8 R12: ffffc900009878f0
[   20.515131][    C0] R13: ffffc90000987898 R14: ffff8880087b0040 R15: ffff8880019b6ac0
[ 20.515134][ C0] ? unwind_next_frame (./include/linux/rcupdate.h:331 ./include/linux/rcupdate.h:841 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 20.515140][ C0] ? unwind_next_frame (./include/linux/rcupdate.h:331 ./include/linux/rcupdate.h:841 ./include/linux/rcupdate.h:1155 arch/x86/kernel/unwind_orc.c:479) 
[ 20.515144][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 20.515150][ 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) 
[ 20.515155][ C0] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.515164][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 20.515167][ C0] ? kernel_text_address (kernel/extable.c:99) 
[ 20.515172][ C0] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 20.515176][ C0] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 20.515187][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 20.515194][ C0] stack_trace_save (kernel/stacktrace.c:123) 
[ 20.515199][ C0] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 20.515204][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 20.515206][ C0] ? writeback_single_inode (fs/fs-writeback.c:1836) 
[ 20.515212][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515218][ C0] kasan_save_stack (mm/kasan/common.c:48) 
[ 20.515223][ C0] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 20.515228][ C0] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 20.515234][ C0] ? writeback_single_inode (fs/fs-writeback.c:1836) 
[ 20.515239][ C0] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 20.515242][ C0] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 20.515245][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515250][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515255][ C0] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 20.515260][ C0] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 20.515266][ C0] ? debug_object_active_state (lib/debugobjects.c:1056) 
[ 20.515274][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515278][ C0] ? __virt_addr_valid (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:953 ./include/linux/mmzone.h:2127 arch/x86/mm/physaddr.c:65) 
[ 20.515281][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515287][ C0] ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21)) 
[ 20.515293][ C0] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 20.515299][ C0] ? __virt_addr_valid (./arch/x86/include/asm/preempt.h:104 ./include/linux/rcupdate.h:955 ./include/linux/mmzone.h:2127 arch/x86/mm/physaddr.c:65) 
[ 20.515303][ C0] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.515308][ C0] kasan_record_aux_stack (mm/kasan/generic.c:548) 
[ 20.515310][ C0] ? __pfx_free_object_rcu (mm/kmemleak.c:524) 
[ 20.515314][ C0] __call_rcu_common.constprop.0 (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:127 kernel/rcu/tree.c:3084) 
[ 20.515321][ C0] kmem_cache_free (./include/linux/kmemleak.h:49 mm/slub.c:2305 mm/slub.c:4642 mm/slub.c:4744) 
[ 20.515327][ C0] ? exit_mmap (mm/mmap.c:1311) 
[ 20.515333][ C0] exit_mmap (mm/mmap.c:1311) 
[ 20.515339][ C0] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 20.515342][ C0] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 20.515346][ C0] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 20.515349][ C0] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:924) 
[ 20.515366][ C0] mmput (kernel/fork.c:1446 kernel/fork.c:1381 kernel/fork.c:1401) 
[ 20.515373][ C0] exit_mm (kernel/exit.c:590) 
[ 20.515377][ C0] do_exit (kernel/exit.c:943) 
[ 20.515380][ C0] do_group_exit (kernel/exit.c:1083) 
[ 20.515384][ C0] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 20.515388][ C0] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 20.515395][ C0] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 20.515402][ C0] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   20.515407][    C0] RIP: 0033:0x7fc055e80abd
[ 20.515411][ C0] Code: Unable to access opcode bytes at 0x7fc055e80a93.

Code starting with the faulting instruction
===========================================
[   20.515413][    C0] RSP: 002b:00007ffc9242eec8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   20.515416][    C0] RAX: ffffffffffffffda RBX: 00007fc055f5d9c0 RCX: 00007fc055e80abd
[   20.515418][    C0] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   20.515419][    C0] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000030
[   20.515422][    C0] R10: 00007ffc9242ed50 R11: 0000000000000246 R12: 00007fc055f5d9c0


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
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal