======================================
| [   16.170019][    C3] 1 lock held by swapper/3/0:
| [ 16.170216][ C3] #0: ffffffffac3749c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch (./include/linux/rcupdate.h:331 kernel/rcu/tree.c:2562) 
| [   16.170569][    C3]
| [   16.170569][    C3] stack backtrace:
[   16.170817][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.170819][    C3] Call Trace:
[   16.170821][    C3]  <IRQ>
[ 16.170824][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.170831][ C3] print_usage_bug.part.0 (kernel/locking/lockdep.c:4046) 
[ 16.170836][ C3] mark_lock_irq (kernel/locking/lockdep.c:4011 kernel/locking/lockdep.c:4057 kernel/locking/lockdep.c:4268) 
[ 16.170841][ C3] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 16.170848][ C3] ? save_trace (kernel/locking/lockdep.c:594) 
[ 16.170853][ C3] mark_lock (kernel/locking/lockdep.c:4754) 
[ 16.170857][ C3] mark_usage (kernel/locking/lockdep.c:4643) 
[ 16.170861][ C3] __lock_acquire (kernel/locking/lockdep.c:5189) 
[ 16.170866][ C3] lock_acquire.part.0 (kernel/locking/lockdep.c:472 kernel/locking/lockdep.c:5868) 
[ 16.170869][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.170872][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.170879][ C3] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 16.170881][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.170885][ C3] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 16.170888][ C3] ? simple_pin_fs (fs/libfs.c:1066) 
[ 16.170890][ C3] simple_pin_fs (fs/libfs.c:1066) 
[ 16.170893][ C3] debugfs_remove (fs/debugfs/inode.c:805 fs/debugfs/inode.c:799) 
[ 16.170896][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.170902][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.170906][ 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) 
[ 16.170913][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.170916][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.170919][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.170922][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.170927][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.170932][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.170935][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.170937][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.170940][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.170947][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.170950][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.170953][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.170959][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.170966][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.170971][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.170975][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.170978][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.170982][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.170986][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.170990][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.170993][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.170997][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.171002][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.171006][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.171011][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.171013][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.171015][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.171019][    C3]  </IRQ>
[   16.171020][    C3]  <TASK>
[ 16.171022][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.171024][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.171029][ C3] 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
[   16.171032][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   16.171035][    C3] RAX: 00000000000464cb RBX: 1ffff9200002afc1 RCX: ffffffffab35ba19
[   16.171037][    C3] RDX: 0000000000000000 RSI: ffffffffabe87785 RDI: ffffffffab651260
[   16.171039][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   16.171041][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   16.171042][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 16.171046][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.171051][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.171053][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.171056][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.171059][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.171064][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.171069][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.171073][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.171077][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.171080][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.171086][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   16.188105][    C3] RCU nest depth: 0, expected: 0
| [   16.188392][    C3] INFO: lockdep is turned off.
| [   16.188569][    C3] Preemption disabled at:
| [ 16.188571][ C3] 0x0 
[   16.188899][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   16.188901][    C3] Call Trace:
[   16.188903][    C3]  <IRQ>
[ 16.188904][ C3] dump_stack_lvl (lib/dump_stack.c:123) 
[ 16.188912][ C3] __might_resched (kernel/sched/core.c:8819) 
[ 16.188919][ C3] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 16.188924][ C3] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 16.188928][ C3] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 16.188933][ C3] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 16.188941][ 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) 
[ 16.188946][ C3] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 16.188949][ C3] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 16.188954][ 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) 
[ 16.188959][ C3] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 16.188962][ C3] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 16.188968][ C3] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 16.188971][ 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) 
[ 16.188978][ C3] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.188982][ C3] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 16.188985][ C3] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 16.188989][ C3] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 16.188994][ C3] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.188997][ C3] ? pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.189001][ C3] ? default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.189003][ C3] ? default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.189006][ C3] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.189011][ C3] ? do_idle (kernel/sched/idle.c:325) 
[ 16.189014][ C3] ? cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.189017][ C3] ? start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.189022][ C3] ? common_startup_64 (arch/x86/kernel/head_64.S:419) 
[ 16.189029][ C3] __put_net (net/core/net_namespace.c:732) 
[ 16.189032][ C3] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 16.189036][ C3] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 16.189040][ C3] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 16.189044][ C3] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 16.189049][ C3] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 16.189052][ C3] ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:151 kernel/locking/spinlock.c:194) 
[ 16.189057][ C3] ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4473) 
[ 16.189061][ C3] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 16.189066][ C3] rcu_core (kernel/rcu/tree.c:2826) 
[ 16.189070][ C3] handle_softirqs (kernel/softirq.c:579) 
[ 16.189075][ C3] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 16.189078][ C3] irq_exit_rcu (kernel/softirq.c:698) 
[ 16.189080][ C3] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   16.189084][    C3]  </IRQ>
[   16.189085][    C3]  <TASK>
[ 16.189087][ C3] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 16.189089][ C3] RIP: 0010:pv_native_safe_halt (arch/x86/kernel/paravirt.c:81) 
[ 16.189093][ C3] 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
[   16.189096][    C3] RSP: 0018:ffffc90000157de8 EFLAGS: 00000242
[   16.189100][    C3] RAX: 00000000000464cb RBX: 1ffff9200002afc1 RCX: ffffffffab35ba19
[   16.189102][    C3] RDX: 0000000000000000 RSI: ffffffffabe87785 RDI: ffffffffab651260
[   16.189104][    C3] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c3667a
[   16.189105][    C3] R10: ffff8880361b33d3 R11: 0000000000000000 R12: 0000000000000000
[   16.189107][    C3] R13: ffff888001bf4640 R14: dffffc0000000000 R15: 0000000000000000
[ 16.189111][ C3] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:146) 
[ 16.189115][ C3] default_idle (./arch/x86/include/asm/paravirt.h:107 arch/x86/kernel/process.c:748) 
[ 16.189118][ C3] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 16.189120][ C3] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 16.189124][ C3] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 16.189129][ C3] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 16.189134][ C3] do_idle (kernel/sched/idle.c:325) 
[ 16.189138][ C3] cpu_startup_entry (kernel/sched/idle.c:422 (discriminator 1)) 
[ 16.189142][ C3] start_secondary (arch/x86/kernel/smpboot.c:203 arch/x86/kernel/smpboot.c:283) 
[ 16.189145][ C3] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:233) 
[ 16.189151][ C3] common_startup_64 (arch/x86/kernel/head_64.S:419) 
| [   18.082524][    C2] INFO: lockdep is turned off.
| [   18.082767][    C2] Preemption disabled at:
| [ 18.082769][ C2] handle_softirqs (kernel/softirq.c:553) 
| [   18.083249][    C2] Tainted: [W]=WARN
[   18.083251][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   18.083253][    C2] Call Trace:
[   18.083255][    C2]  <IRQ>
[ 18.083257][ C2] dump_stack_lvl (lib/dump_stack.c:123) 
[ 18.083267][ C2] __might_resched (kernel/sched/core.c:8819) 
[ 18.083275][ C2] down_write (./include/linux/kernel.h:73 kernel/locking/rwsem.c:1576) 
[ 18.083281][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.083285][ C2] ? simple_recursive_removal (./include/linux/dcache.h:345 fs/libfs.c:610) 
[ 18.083291][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083300][ 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) 
[ 18.083306][ C2] simple_recursive_removal (./include/linux/dcache.h:409 ./include/linux/dcache.h:424 ./include/linux/dcache.h:434 fs/libfs.c:616) 
[ 18.083309][ C2] ? __pfx_remove_one (fs/debugfs/inode.c:780) 
[ 18.083315][ 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) 
[ 18.083319][ C2] debugfs_remove (fs/debugfs/inode.c:806 fs/debugfs/inode.c:799) 
[ 18.083322][ C2] ref_tracker_dir_exit (lib/ref_tracker.c:423 lib/ref_tracker.c:195) 
[ 18.083329][ C2] ? __pfx_ref_tracker_free (lib/ref_tracker.c:253) 
[ 18.083332][ 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) 
[ 18.083340][ C2] ? rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.083345][ C2] ? __pfx_ref_tracker_dir_exit (lib/ref_tracker.c:189) 
[ 18.083348][ C2] ? irq_exit_rcu (kernel/softirq.c:698) 
[ 18.083350][ C2] ? sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[ 18.083357][ C2] ? asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.083362][ C2] ? ftrace_graph_ret_addr (kernel/trace/fgraph.c:956) 
[ 18.083366][ C2] ? unwind_next_frame (./arch/x86/include/asm/unwind.h:111 ./arch/x86/include/asm/unwind.h:127 arch/x86/kernel/unwind_orc.c:588) 
[ 18.083373][ C2] ? arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 18.083378][ C2] ? stack_trace_save (kernel/stacktrace.c:123) 
[ 18.083382][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 18.083387][ C2] ? kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 18.083390][ C2] ? kasan_save_free_info (mm/kasan/generic.c:579) 
[ 18.083394][ C2] ? __kasan_slab_free (mm/kasan/common.c:271) 
[ 18.083397][ C2] ? bpf_sk_storage_free (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 net/core/bpf_sk_storage.c:61) 
[ 18.083401][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083406][ C2] __put_net (net/core/net_namespace.c:732) 
[ 18.083411][ C2] __sk_destruct (./include/net/net_namespace.h:288 ./include/net/net_namespace.h:390 net/core/sock.c:2366) 
[ 18.083415][ C2] ? rcu_do_batch (kernel/rcu/tree.c:2568) 
[ 18.083418][ C2] rcu_do_batch (./include/linux/rcupdate.h:341 kernel/rcu/tree.c:2570) 
[ 18.083423][ C2] ? __pfx_rcu_do_batch (kernel/rcu/tree.c:2492) 
[ 18.083427][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083430][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.083436][ C2] rcu_core (kernel/rcu/tree.c:2826) 
[ 18.083441][ C2] handle_softirqs (kernel/softirq.c:579) 
[ 18.083446][ C2] __irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680) 
[ 18.083448][ C2] irq_exit_rcu (kernel/softirq.c:698) 
[ 18.083450][ C2] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1049 arch/x86/kernel/apic/apic.c:1049) 
[   18.083454][    C2]  </IRQ>
[   18.083455][    C2]  <TASK>
[ 18.083457][ C2] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 18.083459][ C2] RIP: 0010:ftrace_graph_ret_addr (kernel/trace/fgraph.c:956) 
[ 18.083463][ C2] Code: 48 89 14 24 e8 9b bb 4b 00 48 8b 14 24 e9 31 ff ff ff 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 57 <49> 89 d7 41 56 41 55 41 54 55 53 48 83 ec 08 48 81 fa d0 46 9f a8
All code
========
   0:	48 89 14 24          	mov    %rdx,(%rsp)
   4:	e8 9b bb 4b 00       	call   0x4bbba4
   9:	48 8b 14 24          	mov    (%rsp),%rdx
   d:	e9 31 ff ff ff       	jmp    0xffffffffffffff43
  12:	66 90                	xchg   %ax,%ax
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	90                   	nop
  1c:	90                   	nop
  1d:	90                   	nop
  1e:	90                   	nop
  1f:	90                   	nop
  20:	90                   	nop
  21:	90                   	nop
  22:	90                   	nop
  23:	90                   	nop
  24:	66 0f 1f 00          	nopw   (%rax)
  28:	41 57                	push   %r15
  2a:*	49 89 d7             	mov    %rdx,%r15		<-- trapping instruction
  2d:	41 56                	push   %r14
  2f:	41 55                	push   %r13
  31:	41 54                	push   %r12
  33:	55                   	push   %rbp
  34:	53                   	push   %rbx
  35:	48 83 ec 08          	sub    $0x8,%rsp
  39:	48 81 fa d0 46 9f a8 	cmp    $0xffffffffa89f46d0,%rdx

Code starting with the faulting instruction
===========================================
   0:	49 89 d7             	mov    %rdx,%r15
   3:	41 56                	push   %r14
   5:	41 55                	push   %r13
   7:	41 54                	push   %r12
   9:	55                   	push   %rbp
   a:	53                   	push   %rbx
   b:	48 83 ec 08          	sub    $0x8,%rsp
   f:	48 81 fa d0 46 9f a8 	cmp    $0xffffffffa89f46d0,%rdx
[   18.083466][    C2] RSP: 0018:ffffc900006b75f8 EFLAGS: 00000246
[   18.083470][    C2] RAX: dffffc0000000000 RBX: 1ffff920000d6eca RCX: ffffc900006b7a50
[   18.083472][    C2] RDX: ffffffffa93028c4 RSI: ffffc900006b7738 RDI: ffff88800b90c640
[   18.083474][    C2] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffc900006b7749
[   18.083476][    C2] R10: ffffffffa8a0c3f7 R11: ffffc900006b7748 R12: ffffc900006b7760
[   18.083478][    C2] R13: ffffc900006b7708 R14: ffffffffad283878 R15: ffffc900006b7a50
[ 18.083481][ C2] ? 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) 
[ 18.083485][ C2] ? kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 18.083490][ C2] unwind_next_frame (./arch/x86/include/asm/unwind.h:111 ./arch/x86/include/asm/unwind.h:127 arch/x86/kernel/unwind_orc.c:588) 
[ 18.083494][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 18.083498][ C2] ? __pfx_unwind_next_frame (arch/x86/kernel/unwind_orc.c:469) 
[ 18.083503][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 18.083506][ C2] ? kernel_text_address (kernel/extable.c:99) 
[ 18.083512][ C2] ? __pfx_stack_trace_consume_entry (kernel/stacktrace.c:83) 
[ 18.083516][ C2] arch_stack_walk (arch/x86/kernel/stacktrace.c:24) 
[ 18.083521][ C2] ? kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 18.083525][ C2] stack_trace_save (kernel/stacktrace.c:123) 
[ 18.083529][ C2] ? __pfx_stack_trace_save (kernel/stacktrace.c:114) 
[ 18.083531][ C2] ? stack_depot_save_flags (lib/stackdepot.c:552 lib/stackdepot.c:619) 
[ 18.083536][ C2] ? kasan_save_stack (mm/kasan/common.c:49) 
[ 18.083539][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 18.083543][ C2] kasan_save_stack (mm/kasan/common.c:48) 
[ 18.083545][ C2] ? kasan_save_stack (mm/kasan/common.c:48) 
[ 18.083548][ C2] ? free_pgtables (mm/memory.c:392) 
[ 18.083553][ C2] ? exit_mmap (mm/mmap.c:1297) 
[ 18.083556][ C2] ? mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 18.083560][ C2] ? exit_mm (kernel/exit.c:590) 
[ 18.083564][ C2] ? do_exit (kernel/exit.c:943) 
[ 18.083567][ C2] ? do_group_exit (kernel/exit.c:1083) 
[ 18.083569][ C2] ? __x64_sys_exit_group (kernel/exit.c:1111) 
[ 18.083572][ C2] ? x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 18.083581][ C2] ? 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) 
[ 18.083584][ C2] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 18.083587][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083591][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083594][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.083598][ C2] ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/preempt.h:104 ./include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:194) 
[ 18.083603][ C2] ? __debug_check_no_obj_freed (lib/debugobjects.c:1110) 
[ 18.083610][ C2] ? __pfx___debug_check_no_obj_freed (lib/debugobjects.c:1070) 
[ 18.083614][ C2] ? trace_rcu_segcb_stats (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736 ./include/trace/events/rcu.h:537) 
[ 18.083618][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083621][ C2] ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40) 
[ 18.083625][ C2] kasan_save_track (./arch/x86/include/asm/current.h:25 mm/kasan/common.c:60 mm/kasan/common.c:69) 
[ 18.083628][ C2] kasan_save_free_info (mm/kasan/generic.c:579) 
[ 18.083631][ C2] __kasan_slab_free (mm/kasan/common.c:271) 
[ 18.083635][ C2] kmem_cache_free (mm/slub.c:4642 mm/slub.c:4744) 
[ 18.083640][ C2] ? unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 18.083646][ C2] unlink_anon_vmas (mm/rmap.c:405 (discriminator 2)) 
[ 18.083649][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083654][ C2] free_pgtables (mm/memory.c:392) 
[ 18.083659][ C2] ? __pfx_free_pgtables (mm/memory.c:349) 
[ 18.083662][ C2] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5829) 
[ 18.083665][ C2] ? exit_mmap (./include/linux/seqlock.h:431 ./include/linux/mmap_lock.h:82 ./include/linux/mmap_lock.h:129 mm/mmap.c:1292) 
[ 18.083669][ C2] ? down_write (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1307 kernel/locking/rwsem.c:1313 kernel/locking/rwsem.c:1578) 
[ 18.083671][ C2] ? __pfx_down_write (kernel/locking/rwsem.c:1575) 
[ 18.083674][ C2] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 18.083678][ C2] ? trace_lock_release (./include/trace/events/lock.h:69 (discriminator 21)) 
[ 18.083684][ C2] exit_mmap (mm/mmap.c:1297) 
[ 18.083688][ C2] ? __pfx_exit_mmap (mm/mmap.c:1259) 
[ 18.083691][ C2] ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:727 kernel/locking/mutex.c:746) 
[ 18.083694][ C2] ? lock_release (kernel/locking/lockdep.c:118 kernel/locking/lockdep.c:5879) 
[ 18.083697][ C2] ? __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) 
[ 18.083705][ C2] mmput (kernel/fork.c:1447 kernel/fork.c:1382 kernel/fork.c:1402) 
[ 18.083709][ C2] exit_mm (kernel/exit.c:590) 
[ 18.083712][ C2] do_exit (kernel/exit.c:943) 
[ 18.083716][ C2] do_group_exit (kernel/exit.c:1083) 
[ 18.083720][ C2] __x64_sys_exit_group (kernel/exit.c:1111) 
[ 18.083726][ C2] x64_sys_call (arch/x86/entry/syscall_64.c:37) 
[ 18.083729][ C2] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) 
[ 18.083732][ C2] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[   18.083735][    C2] RIP: 0033:0x7feec05eeabd
[ 18.083738][ C2] Code: Unable to access opcode bytes at 0x7feec05eea93.

Code starting with the faulting instruction
===========================================
[   18.083739][    C2] RSP: 002b:00007ffde686e2e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[   18.083743][    C2] RAX: ffffffffffffffda RBX: 00007feec06cb9c0 RCX: 00007feec05eeabd
[   18.083744][    C2] RDX: 00000000000000e7 RSI: ffffffffffffff80 RDI: 0000000000000000
[   18.083746][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000030
[   18.083748][    C2] R10: 00007ffde686e170 R11: 0000000000000246 R12: 00007feec06cb9c0


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