======================================
| [   17.241753][    C2] 1 lock held by swapper/2/0:
| [ 17.242084][ C2] #0: ffffffffb47749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   17.242679][    C2]
| [   17.242679][    C2] stack backtrace:
[   17.243083][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.243087][    C2] Call Trace:
[   17.243090][    C2]  <IRQ>
[ 17.243094][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.243105][ C2] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 17.243115][ C2] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 17.243124][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 17.243133][ C2] ? save_trace (kernel/locking/lockdep.c:594) 
[ 17.243141][ C2] mark_lock (kernel/locking/lockdep.c:4754) 
[ 17.243149][ C2] mark_usage (kernel/locking/lockdep.c:4643) 
[ 17.243155][ C2] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 17.243165][ C2] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 17.243170][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.243177][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.243185][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 17.243189][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.243196][ C2] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 17.243202][ C2] ? simple_pin_fs (fs/libfs.c:1066) 
[ 17.243206][ C2] simple_pin_fs (fs/libfs.c:1066) 
[ 17.243211][ C2] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 17.243218][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.243226][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.243231][ 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:2366) 
[ 17.243238][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.243244][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.243249][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.243253][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.243260][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.243266][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.243271][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.243275][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.243280][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.243287][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 17.243291][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.243296][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.243303][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.243314][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.243320][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.243327][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.243331][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.243338][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.243346][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.243352][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.243358][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.243365][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.243372][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.243378][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.243388][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.243393][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.243397][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.243403][    C2]  </IRQ>
[   17.243405][    C2]  <TASK>
[ 17.243408][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.243413][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.243419][ C2] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 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:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  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
[   17.243425][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   17.243430][    C2] RAX: 000000000003e111 RBX: 1ffff92000028fc1 RCX: ffffffffb375ba19
[   17.243434][    C2] RDX: 0000000000000000 RSI: ffffffffb4287785 RDI: ffffffffb3a51260
[   17.243438][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   17.243441][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   17.243444][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 17.243452][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.243461][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.243466][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.243470][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.243477][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.243485][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.243493][ C2] do_idle (kernel/sched/idle.c:325) 
[ 17.243499][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.243506][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.243512][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.243522][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   17.270761][    C2] RCU nest depth: 0, expected: 0
| [   17.271232][    C2] INFO: lockdep is turned off.
| [   17.271499][    C2] Preemption disabled at:
| [ 17.271502][ C2] 0x0 
[   17.272013][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   17.272016][    C2] Call Trace:
[   17.272019][    C2]  <IRQ>
[ 17.272023][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 17.272035][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 17.272045][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 17.272052][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 17.272057][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 17.272064][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 17.272073][ 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) 
[ 17.272082][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 17.272087][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 17.272094][ 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) 
[ 17.272103][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 17.272108][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 17.272115][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 17.272121][ 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:2366) 
[ 17.272128][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.272135][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 17.272140][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 17.272146][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 17.272153][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.272158][ C2] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.272163][ C2] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.272168][ C2] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.272172][ C2] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.272179][ C2] ? do_idle (kernel/sched/idle.c:325) 
[ 17.272184][ C2] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.272189][ C2] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.272196][ C2] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 17.272207][ C2] __put_net (net/core/net_namespace.c:732) 
[ 17.272213][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 17.272220][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 17.272225][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 17.272232][ C2] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 17.272241][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 17.272248][ C2] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 17.272254][ C2] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 17.272260][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 17.272269][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 17.272276][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 17.272286][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 17.272290][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 17.272295][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   17.272301][    C2]  </IRQ>
[   17.272303][    C2]  <TASK>
[ 17.272305][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 17.272310][ C2] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 17.272317][ C2] Code: 60 b8 00 e9 c3 57 02 00 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 c3 75 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:	60                   	(bad)
   1:	b8 00 e9 c3 57       	mov    $0x57c3e900,%eax
   6:	02 00                	add    (%rax),%al
   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 c3 75 13 00 	verw   0x1375c3(%rip)        # 0x1375eb
  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
[   17.272321][    C2] RSP: 0018:ffffc90000147de8 EFLAGS: 00000246
[   17.272327][    C2] RAX: 000000000003e111 RBX: 1ffff92000028fc1 RCX: ffffffffb375ba19
[   17.272331][    C2] RDX: 0000000000000000 RSI: ffffffffb4287785 RDI: ffffffffb3a51260
[   17.272335][    C2] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c2667a
[   17.272338][    C2] R10: ffff8880361333d3 R11: 0000000000000000 R12: 0000000000000000
[   17.272341][    C2] R13: ffff888001bf2340 R14: dffffc0000000000 R15: 0000000000000000
[ 17.272349][ C2] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 17.272358][ C2] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 17.272362][ C2] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 17.272367][ C2] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 17.272373][ C2] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 17.272381][ C2] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 17.272393][ C2] do_idle (kernel/sched/idle.c:325) 
[ 17.272400][ C2] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 17.272406][ C2] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 17.272412][ C2] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 17.272422][ C2] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   20.104054][    C3] INFO: lockdep is turned off.
| [   20.104401][    C3] Preemption disabled at:
| [ 20.104404][ C3] handle_softirqs (kernel/softirq.c:553) 
| [   20.105000][    C3] Tainted: [W]=WARN
[   20.105001][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   20.105004][    C3] Call Trace:
[   20.105005][    C3]  <IRQ>
[ 20.105007][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 20.105015][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 20.105021][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 20.105025][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 20.105029][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 20.105033][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.105040][ 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) 
[ 20.105044][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 20.105047][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 20.105051][ 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) 
[ 20.105056][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 20.105059][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 20.105064][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 20.105067][ 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:2366) 
[ 20.105072][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.105076][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 20.105079][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 20.105082][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 20.105087][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.105091][ C3] ? unwind_next_frame (arch/x86/kernel/unwind_orc.c:403 arch/x86/kernel/unwind_orc.c:585) 
[ 20.105095][ C3] ? __unwind_start (./arch/x86/include/asm/unwind.h:50 arch/x86/kernel/unwind_orc.c:755) 
[ 20.105099][ C3] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 20.105103][ C3] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 20.105107][ C3] ? set_track_prepare (mm/slub.c:936) 
[ 20.105112][ C3] ? __alloc_object (mm/kmemleak.c:697) 
[ 20.105116][ C3] ? __create_object (mm/kmemleak.c:770) 
[ 20.105119][ C3] ? __kmalloc_cache_noprof (./include/linux/kmemleak.h:43 mm/slub.c:4151 mm/slub.c:4196 mm/slub.c:4353) 
[ 20.105124][ C3] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 20.105128][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.105133][ C3] __put_net (net/core/net_namespace.c:732) 
[ 20.105137][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 20.105141][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 20.105145][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 20.105150][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 20.105154][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.105158][ C3] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 20.105164][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 20.105168][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 20.105172][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 20.105175][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 20.105177][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   20.105181][    C3]  </IRQ>
[   20.105182][    C3]  <TASK>
[ 20.105183][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 20.105186][ C3] RIP: 0010:unwind_next_frame (arch/x86/kernel/unwind_orc.c:403 arch/x86/kernel/unwind_orc.c:585) 
[ 20.105191][ C3] Code: ea ff ff 4c 8b 1c 24 e9 4e f9 ff ff 48 8b 44 24 68 ba 08 00 00 00 4c 89 ef 4c 8d 78 f8 48 89 44 24 28 4c 89 fe e8 ad f2 ff ff <4d> 8d 5d 40 84 c0 0f 84 24 f9 ff ff 4c 89 ff e8 49 e5 ff ff 4c 89
All code
========
   0:	ea                   	(bad)
   1:	ff                   	(bad)
   2:	ff 4c 8b 1c          	decl   0x1c(%rbx,%rcx,4)
   6:	24 e9                	and    $0xe9,%al
   8:	4e f9                	rex.WRX stc
   a:	ff                   	(bad)
   b:	ff 48 8b             	decl   -0x75(%rax)
   e:	44 24 68             	rex.R and $0x68,%al
  11:	ba 08 00 00 00       	mov    $0x8,%edx
  16:	4c 89 ef             	mov    %r13,%rdi
  19:	4c 8d 78 f8          	lea    -0x8(%rax),%r15
  1d:	48 89 44 24 28       	mov    %rax,0x28(%rsp)
  22:	4c 89 fe             	mov    %r15,%rsi
  25:	e8 ad f2 ff ff       	call   0xfffffffffffff2d7
  2a:*	4d 8d 5d 40          	lea    0x40(%r13),%r11		<-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 84 24 f9 ff ff    	je     0xfffffffffffff95a
  36:	4c 89 ff             	mov    %r15,%rdi
  39:	e8 49 e5 ff ff       	call   0xffffffffffffe587
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	4d 8d 5d 40          	lea    0x40(%r13),%r11
   4:	84 c0                	test   %al,%al
   6:	0f 84 24 f9 ff ff    	je     0xfffffffffffff930
   c:	4c 89 ff             	mov    %r15,%rdi
   f:	e8 49 e5 ff ff       	call   0xffffffffffffe55d
  14:	4c                   	rex.WR
  15:	89                   	.byte 0x89
[   20.105194][    C3] RSP: 0018:ffffc90000a57870 EFLAGS: 00000282
[   20.105198][    C3] RAX: 0000000000000001 RBX: 1ffff9200014af17 RCX: ffffc90000a58000
[   20.105200][    C3] RDX: ffffc90000a57901 RSI: 0000000000000001 RDI: ffffc90000a579c0
[   20.105202][    C3] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffc90000a57a01
[   20.105203][    C3] R10: ffffffffb0e0c3f7 R11: ffffc90000a577e8 R12: ffffc90000a57a18
[   20.105205][    C3] R13: ffffc90000a579c0 R14: ffffffffb5596584 R15: ffffc90000a579b8
[ 20.105208][ C3] ? 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) 
[ 20.105215][ C3] ? __unwind_start (arch/x86/kernel/unwind_orc.c:712) 
[ 20.105219][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 20.105223][ C3] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 20.105227][ C3] ? kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 20.105230][ C3] ? __kasan_slab_alloc (mm/kasan/common.c:348) 
[ 20.105233][ C3] ? kmem_cache_alloc_noprof (./include/linux/kasan.h:250 mm/slub.c:4147 mm/slub.c:4196 mm/slub.c:4203) 
[ 20.105237][ C3] ? __alloc_object (mm/kmemleak.c:481 mm/kmemleak.c:661) 
[ 20.105240][ C3] ? __create_object (mm/kmemleak.c:770) 
[ 20.105243][ C3] ? __kmalloc_cache_noprof (./include/linux/kmemleak.h:43 mm/slub.c:4151 mm/slub.c:4196 mm/slub.c:4353) 
[ 20.105246][ C3] ? get_stack_info_noinstr (arch/x86/kernel/dumpstack_64.c:173) 
[ 20.105251][ C3] __unwind_start (./arch/x86/include/asm/unwind.h:50 arch/x86/kernel/unwind_orc.c:755) 
[ 20.105255][ C3] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 20.105259][ C3] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 20.105264][ C3] ? __unwind_start (arch/x86/kernel/unwind_orc.c:712) 
[ 20.105269][ C3] stack_trace_save (kernel/stacktrace.c:123) 
[ 20.105272][ C3] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 20.105277][ C3] ? __alloc_object (mm/kmemleak.c:481 mm/kmemleak.c:661) 
[ 20.105281][ C3] set_track_prepare (mm/slub.c:936) 
[ 20.105284][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 20.105288][ C3] ? trace_kmem_cache_alloc (./include/trace/events/kmem.h:12 (discriminator 21)) 
[ 20.105291][ C3] ? lockdep_init_map_type (kernel/locking/lockdep.c:4974) 
[ 20.105295][ C3] __alloc_object (mm/kmemleak.c:697) 
[ 20.105299][ C3] __create_object (mm/kmemleak.c:770) 
[ 20.105303][ C3] __kmalloc_cache_noprof (./include/linux/kmemleak.h:43 mm/slub.c:4151 mm/slub.c:4196 mm/slub.c:4353) 
[ 20.105308][ C3] kmem_cache_free (mm/slub.c:2333 mm/slub.c:4642 mm/slub.c:4744) 
[ 20.105313][ C3] ? exit_mmap (mm/mmap.c:1311) 
[ 20.105318][ C3] exit_mmap (mm/mmap.c:1311) 
[ 20.105321][ C3] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 20.105324][ C3] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 20.105328][ C3] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 20.105330][ C3] ? __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) 
[ 20.105338][ C3] mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 20.105344][ C3] exit_mm (kernel/exit.c:590) 
[ 20.105348][ C3] do_exit (kernel/exit.c:943) 
[ 20.105352][ C3] do_group_exit (kernel/exit.c:1083) 
[ 20.105356][ C3] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 20.105359][ C3] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 20.105364][ C3] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 20.105367][ C3] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   20.105370][    C3] RIP: 0033:0x7fd6dd0ceabd
[ 20.105373][ C3] Code: Unable to access opcode bytes at 0x7fd6dd0cea93.

Code starting with the faulting instruction
===========================================
[   20.105375][    C3] RSP: 002b:00007ffe265a2818 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   20.105378][    C3] RAX: ffffffffffffffda RBX: 00007fd6dd1ab9c0 RCX: 00007fd6dd0ceabd
[   20.105380][    C3] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   20.105381][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020
[   20.105383][    C3] R10: 00007ffe265a26c0 R11: 0000000000000246 R12: 00007fd6dd1ab9c0


Finger prints:
handle_softirqs:dump_stack_lvl:__might_resched:down_write:simple_recursive_removal
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